CB DBA Chubb Limited

Exhibit 1.1

Executed Version

CHUBB INA HOLDINGS LLC

(a Delaware limited liability company)

Senior and Subordinated Debt Securities

Unconditionally Guaranteed as to Payment of

Principal, Premium, if any, and Interest by

CHUBB LIMITED

UNDERWRITING AGREEMENT

Dated: July 29, 2024

Table of Contents

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CHUBB INA HOLDINGS LLC

(a Delaware limited liability company)

Senior and Subordinated Debt Securities

Unconditionally Guaranteed as to Payment of

Principal, Premium, if any, and Interest by

CHUBB LIMITED

UNDERWRITING AGREEMENT

July 29, 2024

within-mentioned Terms Agreement

Ladies and Gentlemen:

Chubb INA Holdings LLC, a Delaware limited liability company (the “Company”), proposes to issue and sell $1,300,000,000 aggregate principal amount of its senior or subordinated debt securities (the “Debt Securities”), from time to time, in or pursuant to one or more offerings on terms to be determined at the time of sale. The Debt Securities will be unconditionally guaranteed as to payment of principal, premium, if any, and interest by Chubb Limited, a Swiss company (the “Guarantor”).

The Debt Securities will be issued in one or more series as senior indebtedness (the “Senior Debt Securities”) under an indenture, dated as of August 1, 1999 (as supplemented by a First Supplemental Indenture, dated as of March 13, 2013, and as may be further amended or supplemented from time to time (including by any supplement which may be entered into in connection with the issuance of such Debt Securities), the “Senior Indenture”), among the Company, the Guarantor and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust Company, N.A., as successor to J.P. Morgan Trust Company, National Association and The First National Bank of Chicago), as trustee (the “Senior Trustee”), or as subordinated indebtedness (the “Subordinated Debt Securities”) under an indenture (the “Subordinated Indenture”, and collectively with the Senior Indenture, the “Indentures”, and each, an “Indenture”), dated as of December 1, 1999 among the Company, the Guarantor and J.P. Morgan Trust Company, National Association, as trustee (the “Subordinated Trustee”, and collectively with the Senior Trustee, the “Trustees”, and each, a “Trustee”). Each series of Debt Securities may vary, as applicable, as to title, aggregate principal amount, rank, interest rate or formula and timing of payments thereof, stated maturity date, redemption and/or repayment provisions, sinking fund requirements, conversion or exchange provisions and any other variable terms established by or pursuant to the applicable Indenture.

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Whenever the Company determines to make an offering of Debt Securities, the Company and the Guarantor will enter into an agreement (each, a “Terms Agreement”) providing for the sale of such Debt Securities to, and the purchase and offering thereof by, the underwriters specified in the Terms Agreement (the “Underwriters”, which term shall include any Underwriter substituted pursuant to Section 10 hereof). The Terms Agreement relating to the offering of Debt Securities shall specify the aggregate principal amount of Debt Securities to be issued (the “Underwritten Securities”), the name of each Underwriter participating in such offering (subject to substitution as provided in Section 10 hereof) and the name of any Underwriter acting as co-manager in connection with such offering, the aggregate principal amount of Underwritten Securities that each such Underwriter severally agrees to purchase, whether such offering is on a fixed or variable price basis and, if on a fixed price basis, the initial offering price, the price at which the Underwritten Securities are to be purchased by the Underwriters, the form, time, date and place of delivery and payment of the Underwritten Securities and any other material variable terms of the Underwritten Securities. The Terms Agreement, which shall be substantially in the form of Exhibit A hereto, may take the form of an exchange of any standard form of written telecommunication between the Company and the Guarantor, on the one hand, and one or more of the Underwriters, acting for themselves and, if applicable, as representative(s) of any other Underwriters. Each offering of Underwritten Securities will be governed by this Underwriting Agreement, as supplemented by the applicable Terms Agreement. As used herein, the term “Representative(s)” means, with respect to any offering of Debt Securities, any Underwriter(s) specified as the representative(s) of the Underwriters of such offering in the applicable Terms Agreement and if none is so designated, it means the Underwriters.

The Company and the Guarantor have filed with the Securities and Exchange Commission (the “Commission”) a joint automatic shelf registration statement on Form S-3 (No. 333-260091), for the registration of the Debt Securities and the guarantee thereof of the Guarantor (the “Guarantee”) under the Securities Act of 1933, as amended (the “1933 Act”), and the offering thereof from time to time in accordance with Rule 415 of the rules and regulations of the Commission under the 1933 Act (the “1933 Act Regulations”). Such registration statement became effective automatically upon filing on October 6, 2021, each Indenture has been duly qualified under the Trust Indenture Act of 1939, as amended (the “1939 Act”), and the Company and the Guarantor have filed such post-effective amendments to such registration statement as may be required prior to the execution of the applicable Terms Agreement and each such post-effective amendment became effective automatically upon filing with the Commission. At any given time, such registration statement (as so amended, if applicable, to such time), including any required information deemed to be a part thereof at such time pursuant to Rule 430B of the 1933 Act Regulations (the “Rule 430B Information”), is referred to herein as the “Registration Statement”; and the final base prospectus or prospectuses and the final prospectus supplement relating to the offering of the Underwritten Securities, in the form first furnished to the Underwriters by the Company and the Guarantor for use in connection with the offering of the Underwritten Securities, are collectively referred to herein as the “Prospectus”; provided, however, that at any given time references to the “Registration Statement” and the “Prospectus” shall also be deemed to include all documents incorporated therein by reference pursuant to the Securities Exchange Act of 1934, as amended (the “1934 Act”), as of, in the case of the Registration Statement, such given date, or, in the case of the Prospectus, as of the date of the Prospectus. A “preliminary prospectus” shall be deemed to refer to any prospectus used before the Registration Statement became effective and any prospectus that omitted information to be included upon pricing in a form of prospectus filed with the Commission pursuant to Rule 424(b) of the 1933 Act Regulations and was used after such effectiveness and prior to the relevant Applicable Time (as defined in the applicable Terms Agreement), including in each case any

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base prospectus so used and the documents incorporated by reference therein. For purposes of this Underwriting Agreement, all references to the Registration Statement, Prospectus or preliminary prospectus or to any amendment or supplement to any of the foregoing shall be deemed to include any copy filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval system (“EDGAR”).

The term “Disclosure Package” shall mean (i) each preliminary prospectus, as amended or supplemented, used in connection with the offer of the Underwritten Securities, (ii) the Final Term Sheet (as defined herein), which shall be identified in Schedule I to the applicable Terms Agreement, and (iii) any issuer free writing prospectuses as defined in Rule 433 of the 1933 Act Regulations (each, an “Issuer Free Writing Prospectus”) that the parties hereto shall hereafter expressly agree in writing to treat as part of the Disclosure Package.

All references in this Underwriting Agreement to financial statements and schedules and other information which are, at a given time, “contained,” “included” or “stated” (or other references of like import) in the Registration Statement, Prospectus or preliminary prospectus shall be deemed to mean and include all such financial statements and schedules and other information which are incorporated by reference or deemed to be included in the Registration Statement, Prospectus or preliminary prospectus, as the case may be, as of, in the case of the Registration Statement, such given time, or, in the case of the Prospectus, the date of the Prospectus, or, in the case of a preliminary prospectus, the relevant Applicable Time; and all references in this Underwriting Agreement to amendments or supplements to the Registration Statement, Prospectus or preliminary prospectus shall be deemed, at a given time, to mean and include the filing of any document under the 1934 Act or the 1933 Act which is incorporated by reference or deemed to be included in the Registration Statement, Prospectus or preliminary prospectus, as the case may be, after, in the case of the Registration Statement, such given time, or, in the case of the Prospectus, the date of the Prospectus, or, in the case of a preliminary prospectus, the relevant Applicable Time.

The term “broadly available road show” means a “bona fide electronic road show” as defined in Rule 433(h)(5) of the 1933 Act Regulations that has been made available without restriction to any person.

I. Representations and Warranties.

A. Representations and Warranties by the Company and the Guarantor. The Company and the Guarantor represent and warrant to each Underwriter named in the applicable Terms Agreement, as of the date thereof, as of the Applicable Time and as of the Closing Time (as defined below) (in each case, a “Representation Date”), as follows:

1. Compliance with Registration Requirements; Disclosure. (i) At the time of filing the Registration Statement, (ii) at the time of the most recent amendment thereto for the purposes of complying with Section 10(a)(3) of the 1933 Act (whether such amendment was by post-effective amendment, incorporated report filed pursuant to Section 13 or 15(d) of the 1934 Act or form of prospectus) and (iii) at the execution time of each of this Agreement and the applicable Terms Agreement (with each such date being used as the determination date for purposes of this clause (iii)), each of the

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Company and the Guarantor was and is a “well known seasoned issuer” as defined in Rule 405 of the 1933 Act Regulations. The Registration Statement is an “automatic shelf registration statement”, as defined in Rule 405 of the 1933 Act Regulations, neither the Company nor the Guarantor has received from the Commission any notice pursuant to Rule 401(g)(2) of the 1933 Act Regulations objecting to use of the automatic shelf registration statement form and neither the Company nor the Guarantor has otherwise ceased to be eligible to use the automatic shelf registration statement form.

At the earliest time after the filing of the Registration Statement relating to the Underwritten Securities that the Company, the Guarantor or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) of the 1933 Act Regulations) and (ii) as of the date of the execution and delivery of each of this Agreement and the applicable Terms Agreement (with each such date being used as the determination date for purposes of this clause (ii)), neither the Company nor the Guarantor was or is an Ineligible Issuer (as defined in Rule 405 of the 1933 Act Regulations), without taking account of any determination by the Commission pursuant to Rule 405 of the 1933 Act Regulations that it is not necessary that either the Company or the Guarantor be considered an Ineligible Issuer.

No stop order has been issued under the 1933 Act and no proceedings for that purpose have been instituted or are pending or, to the knowledge of the Company or the Guarantor, are contemplated by the Commission, and any request on the part of the Commission for additional information has been complied with. In addition, each Indenture has been duly qualified under the 1939 Act.

At the respective times the Registration Statement became effective or was deemed effective with respect to the Underwriters pursuant to Rule 430B(f)(2) of the 1933 Act Regulations and at each Representation Date, the Registration Statement and any amendments thereto complied and will comply in all material respects with the requirements of the 1933 Act, the 1933 Act Regulations, the 1939 Act and the rules and regulations of the Commission under the 1939 Act (the “1939 Act Regulations”) and did not and will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading.

At the date of the Prospectus and at the Closing Time, neither the Prospectus nor any amendments and supplements thereto included or will include an untrue statement of a material fact or omitted or will omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

As of the Applicable Time, the Disclosure Package did not contain any untrue statement of a material fact or omit to state any material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

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Any Issuer Free Writing Prospectus and the Final Term Sheet, as of their issue dates and at all subsequent times through the completion of the offering of the Underwritten Securities or until any earlier date that the Company or the Guarantor notified or notifies the Representative(s) as described in the next sentence, did not, do not and will not include any information that conflicted, conflicts or will conflict with the information contained in the Registration Statement, the Prospectus or any preliminary prospectus, including any document incorporated by reference therein that has not been superseded or modified. If at any time following issuance of an Issuer Free Writing Prospectus there occurred or occurs an event or development as a result of which such Issuer Free Writing Prospectus conflicted or would conflict with the information contained in the Registration Statement, the Prospectus or any preliminary prospectus, the Company has promptly notified or will promptly notify the Representative(s) and has promptly amended or supplemented or will promptly amend or supplement, at its own expense, such Issuer Free Writing Prospectus to eliminate or correct such conflict.

Each broadly available road show, if any, when considered together with the Disclosure Package, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading.

Neither the Company nor the Guarantor has distributed nor will it distribute, prior to the later of the Closing Time and the completion of the Underwriters’ distribution of the Underwritten Securities, any offering material in connection with the offering and sale of the Underwritten Securities other than a preliminary prospectus, the Prospectus, any Issuer Free Writing Prospectus reviewed and consented to by the Representative(s) and included in Schedule I to the applicable Terms Agreement, any electronic road show reviewed and consented to by the Representative(s), or the Registration Statement.

Notwithstanding the foregoing, the representations and warranties in this subsection shall not apply to statements in or omissions from the Registration Statement, the Disclosure Package or the Prospectus made in reliance upon and in conformity with information furnished to the Company or the Guarantor in writing by any Underwriter through the Representative(s) expressly for use in the Registration Statement, the Disclosure Package or the Prospectus.

To the Company’s knowledge, the Registration Statement is not the subject of a pending proceeding or examination under Section 8(d) or 8(e) of the 1933 Act, nor is the Company or the Guarantor the subject of a pending proceeding under Section 8A of the 1933 Act in connection with the offering of the Underwritten Securities.

Each preliminary prospectus and the Prospectus filed as part of the Registration Statement as originally filed or as part of any amendment thereto, or filed pursuant to Rule 424 of the 1933 Act Regulations, complied when so filed in all material respects with the 1933 Act Regulations and each preliminary prospectus and the Prospectus delivered to the Underwriters for use in connection with the offering of Underwritten Securities will, at the time of such delivery, be identical to any electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

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2. Incorporated Documents. The documents incorporated or deemed to be incorporated by reference in the Registration Statement, the Disclosure Package and the Prospectus, at the time they were or hereafter are filed with the Commission, complied and will comply in all material respects with the requirements of the 1934 Act and the rules and regulations of the Commission thereunder (the “1934 Act Regulations”) and, when read together with the other information in the Disclosure Package or the Prospectus, as the case may be, at the Applicable Time or at the date of the Prospectus, as the case may be, and at the Closing Time, did not and will not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading.

3. Independent Accountants. The accountants who certified or shall certify the financial statements and any supporting schedules thereto of the Guarantor included in each of the Registration Statement, the Disclosure Package and the Prospectus are independent public accountants with respect to the Guarantor and its subsidiaries as required by the 1933 Act and the 1933 Act Regulations.

4. Financial Statements. (a) The financial statements of the Guarantor included in each of the Registration Statement, the Disclosure Package and the Prospectus, together with the related schedules and notes, as well as those financial statements, schedules and notes of any other entity included therein, present fairly the financial position of the Guarantor and its consolidated subsidiaries, or such other entity, as the case may be, at the dates indicated and the statement of operations, stockholders’ equity and cash flows of the Guarantor and its consolidated subsidiaries, or such other entity, as the case may be, for the periods specified. Such financial statements have been prepared in conformity with United States generally accepted accounting principles (“GAAP”) applied on a consistent basis throughout the periods involved, except as indicated therein or in the notes thereto. The supporting schedules, if any, included in each of the Registration Statement, the Disclosure Package and the Prospectus present fairly in accordance with GAAP the information required to be stated therein. The selected financial data and the summary financial information, if any, of the Guarantor included in each of the Disclosure Package and the Prospectus present fairly the information shown therein and have been compiled on a basis consistent with that of the related audited financial statements included in the Registration Statement, the Disclosure Package and the Prospectus.

(b) The interactive data in eXtensible Business Reporting Language included or incorporated by reference in the Registration Statement, the Disclosure Package and the Prospectus presents fairly the information called for in all material respects and has been prepared in accordance with the Commission’s rules and guidelines applicable thereto.

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5. No Material Adverse Change in Business. Since the respective dates as of which information is given in the Registration Statement, the Disclosure Package and the Prospectus, except as otherwise stated therein, (i) neither the Guarantor nor any of its subsidiaries (including the Company) has sustained any material loss or material interference with its business from any action, notice, order or decree from an insurance regulatory authority and (ii) there has been (A) no material adverse change in case reserves or losses or loss expense of the Guarantor and its consolidated subsidiaries (including the Company) and (B) no material adverse change, nor any development or event involving a prospective material adverse change, in the financial condition, business, or results of operations of the Guarantor and its subsidiaries (including the Company) considered as one enterprise, in either case whether or not arising in the ordinary course of business (a “Material Adverse Change”).

6. Good Standing of the Company; Place of Management. The Company is a wholly-owned subsidiary of the Guarantor and it has been duly formed and is subsisting and in good standing under the laws of the State of Delaware, with limited liability company power and authority to own, lease and operate its properties and to conduct its business as described in each of the Disclosure Package and the Prospectus and to enter into and perform its obligations under, or as contemplated under, this Underwriting Agreement and the applicable Terms Agreement. The Company is duly qualified to transact business as a foreign limited liability company and is in good standing in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification, except where the failure to so qualify or be in good standing would not reasonably be expected to result in a Material Adverse Change. The Company is domiciled and has its effective place of management outside Switzerland.

7. Valid Existence of the Guarantor. The Guarantor has been duly created for an unlimited duration and is validly existing as a company limited by shares (Aktiengesellschaft) under the laws of Switzerland, with corporate power and authority to own, lease and operate its properties and to conduct its business as described in each of the Disclosure Package and the Prospectus and to enter into and perform its obligations under, or as contemplated under, this Underwriting Agreement and the applicable Terms Agreement. The Guarantor is duly qualified to transact business as a foreign corporation and is in good standing in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification, except where the failure to so qualify or be in good standing would not reasonably be expected to result in a Material Adverse Change.

8. Good Standing of Corporate Subsidiaries. Each subsidiary of the Guarantor, other than such subsidiaries as would not, individually or in the aggregate, constitute a “significant subsidiary” as such term is defined in Rule 1-02 of Regulation S-X promulgated under the 1933 Act (each, a “Significant Subsidiary”) (including the Company), that is a corporation and/or limited liability company has been duly incorporated or organized and is an existing corporation and/or limited liability company in good standing (with respect to jurisdictions that recognize such concept) under the laws of the jurisdiction of its incorporation, with corporate power and authority to own, lease and operate its properties and to conduct its business as described in each of the

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Disclosure Package and the Prospectus; each such Significant Subsidiary of the Guarantor is duly qualified to transact business as a foreign corporation and/or foreign limited liability company and is in good standing (with respect to jurisdictions that recognize such concept) in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification, except where the failure to so qualify or be in good standing would not reasonably be expected to result in a Material Adverse Change; all of the issued and outstanding capital stock of each such Significant Subsidiary of the Guarantor has been duly authorized and validly issued and is fully paid and nonassessable; and all of the issued and outstanding capital stock of each such Significant Subsidiary is owned by the Guarantor, directly or through subsidiaries, except for de minimis shareholdings as required to comply with applicable law, and such capital stock is owned free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity (except for restrictions on transferability of the shares of insurance subsidiaries, under applicable law).

9. Good Standing of Partnership Subsidiaries. Each Significant Subsidiary of the Guarantor that is a partnership has been duly formed and is an existing partnership in good standing (with respect to jurisdictions that recognize such concept) under the laws of the jurisdiction of its formation, with power and authority to own, lease and operate its properties and to conduct its business as described in each of the Disclosure Package and the Prospectus; each such Significant Subsidiary of the Guarantor is duly qualified to transact business and is in good standing (with respect to jurisdictions that recognize such concept) in all other jurisdictions in which its ownership or lease of property or the conduct of its business requires such qualification, except where the failure to so qualify or be in good standing would not reasonably be expected to result in a Material Adverse Change; all of the outstanding equity interests of each such Significant Subsidiary of the Guarantor have been duly authorized and validly issued; and all of the equity interests of each such Significant Subsidiary are owned by the Guarantor, directly or through subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity (other than immaterial amounts necessary to comply with applicable law).

10. Capitalization. If the Disclosure Package or the Prospectus contains a “Capitalization” section, the authorized, issued and outstanding shares of capital stock of the Guarantor are as set forth in the column entitled “Actual” under such section (except for subsequent issuances thereof, if any, pursuant to reservations, agreements or employee benefit plans or pursuant to the exercise of convertible securities or options). Such shares of capital stock have been duly authorized and validly issued by the Guarantor and are fully paid and non-assessable, and none of such shares of capital stock was issued in violation of preemptive or other similar rights of any securityholder of the Guarantor.

11. Authorization of this Underwriting Agreement and Terms Agreement. This Underwriting Agreement has been, and the applicable Terms Agreement as of the date thereof will have been, duly authorized, executed and delivered by each of the Company and the Guarantor.

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12. Authorization of Underwritten Securities. The Underwritten Securities have been, or as of the date of the applicable Terms Agreement will have been, duly authorized by the Company for issuance and sale pursuant to this Underwriting Agreement and such Terms Agreement. Such Underwritten Securities, when issued and authenticated in the manner provided for in the applicable Indenture and delivered against payment of the consideration therefor specified in such Terms Agreement, will constitute valid and binding obligations of the Company, enforceable against the Company in accordance with their terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or other similar laws affecting the enforcement of creditors’ rights generally or by general equitable principles (regardless of whether enforcement is considered in a proceeding in equity or at law), and except further as enforcement thereof may be limited by requirements that a claim with respect to any Underwritten Securities payable in a foreign or composite currency (or a foreign or composite currency judgment in respect of such claim) be converted into U.S. dollars at a rate of exchange prevailing on a date determined pursuant to applicable law or by governmental authority to limit, delay or prohibit the making of payments outside the United States. Such Underwritten Securities will be in the form contemplated by, and each registered holder thereof will be entitled to the benefits of, the applicable Indenture.

13. Authorization of Guarantee. The Guarantee has been, or as of the date of such Terms Agreement will have been, duly authorized by the Guarantor for issuance pursuant to this Underwriting Agreement and the applicable Terms Agreement. Such Guarantee, when issued and delivered in the manner provided for in the applicable Indenture, will constitute a valid and binding obligation of the Guarantor, enforceable against the Guarantor in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or other similar laws affecting the enforcement of creditors’ rights generally or by general equitable principles (regardless of whether enforcement is considered in a proceeding in equity or at law), and will be in the form contemplated by, and entitled to the benefits of, the Indenture.

14. Authorization of the Indentures. The applicable Indenture has been or prior to the issuance of the Debt Securities thereunder will have been, duly authorized, executed and delivered by the Company and the Guarantor and, upon such authorization, execution and delivery, will constitute a valid and binding agreement of the Company and the Guarantor, enforceable against each of them in accordance with its terms, except as the enforcement thereof may be limited by bankruptcy, insolvency (including, without limitation, all laws relating to fraudulent transfers), reorganization, moratorium or other similar laws affecting the enforcement of creditors’ rights generally or by general equitable principles (regardless of whether enforcement is considered in a proceeding in equity or at law).

15. Descriptions of the Underwritten Securities, the Guarantee and the Indentures. The Underwritten Securities being sold pursuant to the applicable Terms Agreement, the Guarantee and each applicable Indenture, as of each Representation Date, will conform in all material respects to the statements relating thereto contained in each of the Disclosure Package and the Prospectus and will be in substantially the form filed or incorporated by reference, as the case may be, as an exhibit to the Registration Statement.

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16. Non-Taxation. Except as disclosed in the Disclosure Package and the Prospectus, under current laws and regulations of the United States and Switzerland, as applicable, and any political subdivision thereof, all principal, interest, premium, if any, and additional amounts payable on the Underwritten Securities or the Guarantee, as applicable, may be paid by the Company or the Guarantor, as applicable, pursuant to the Underwritten Securities or the Guarantee, as applicable, to the holders thereof in United States dollars and may be freely transferred out of the United States or Switzerland, as applicable, and all such payments made to holders thereof or therein who are non-residents of the United States or Switzerland, as applicable, will not be subject to income, withholding or other taxes under laws and regulations of the United States or Switzerland, as applicable, or any political subdivision or taxing authority thereof or therein and will otherwise be free and clear of any other tax, duty, withholding or deduction in the United States and Switzerland, as applicable, or any political subdivision or taxing authority thereof or therein and without the necessity of obtaining any governmental authorization in the United States or Switzerland, as applicable, or any political subdivision or taxing authority thereof or therein. No stamp, issuance, transfer or other similar taxes or duties (“Stamp Taxes”) are payable by or on behalf of the Underwriters in the United States or Switzerland or any political subdivision or of any other jurisdiction in which the Company or the Guarantor, as the case may be, is organized or is otherwise resident for tax purposes or any jurisdiction from or through which a payment is made on (i) the creation, issue or delivery by the Company of the Underwritten Securities, (ii) the creation, issue or delivery by the Guarantor of the Guarantee, (iii) the purchase by the Underwriters of the Underwritten Securities (including the Guarantee) in the manner contemplated by this Agreement, (iv) the resale and delivery by the Underwriters of the Underwritten Securities (including the Guarantee) contemplated by this Agreement or (v) the execution and delivery of this Agreement and the other transaction documents and the consummation of the transactions contemplated hereby and thereby.

17. Reserves. The description of the Guarantor’s reserves and reserving methodology and assumptions described in each of the Disclosure Package and the Prospectus is accurate and fairly presents the information set forth therein in all material respects and, since the date of the latest financial statements included in each of the Disclosure Package and the Prospectus, no loss experience has developed which would require or make it appropriate for the Guarantor to alter or modify such methodology.

18. Absence of Defaults and Conflicts. Neither the Guarantor nor any of its subsidiaries (including the Company) is in violation of its charter or by-laws, partnership agreement or other constitutive documents or in default in the performance or observance of any obligation, agreement, covenant or condition contained in any contract, indenture, mortgage, deed of trust, loan or credit agreement, note, lease or other agreement or instrument to which the Guarantor or any of its subsidiaries (including the Company) is a party or by which it or any of them may be bound, or to which any of the assets,

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properties or operations of the Guarantor or any of its subsidiaries (including the Company) is subject (collectively, “Agreements and Instruments”), except for such defaults that would not reasonably be expected to result in a Material Adverse Change. The execution, delivery and performance of this Underwriting Agreement, the applicable Terms Agreement and each applicable Indenture and any other agreement or instrument entered into or issued or to be entered into or issued by the Company or the Guarantor in connection with the transactions contemplated hereby or thereby or in the Registration Statement, the Disclosure Package and the Prospectus, and the consummation of the transactions contemplated herein and in the Registration Statement, the Disclosure Package and the Prospectus (including, without limitation, the issuance and sale of the Underwritten Securities, the issuance of the Guarantee, and the use of the proceeds from the sale of the Underwritten Securities, together with the Guarantee, as described under the caption “Use of Proceeds”) and compliance by the Company and the Guarantor, as applicable, with their respective obligations hereunder and thereunder have been duly authorized by all necessary corporate action and do not and will not, whether with or without the giving of notice or passage of time or both, conflict with or constitute a breach of, or default or Repayment Event (as defined below) under, or result in the creation or imposition of any lien, charge or encumbrance upon any assets, properties or operations of the Guarantor or any of its subsidiaries (including the Company) pursuant to, any Agreements and Instruments (except for such conflicts, breaches, defaults or Repayment Events or liens, charges or encumbrances that would not reasonably be expected to result in a Material Adverse Change), nor will such action result in any violation of the provisions of the charter, by-laws, partnership agreement or other constitutive document of the Guarantor or any of its subsidiaries (including the Company) or, to the best of the Company’s and the Guarantor’s knowledge, any applicable law, statute, rule, regulation, judgment, order, writ or decree of any government, government instrumentality or court, domestic or foreign, having jurisdiction over the Guarantor or any of its subsidiaries (including the Company) or over any of the assets, properties or operations of the Guarantor or any of its subsidiaries (including the Company), except for such violations under applicable law, statute, rule, regulation, judgment, order, writ or decree as would not reasonably be expected to result in a Material Adverse Change. As used herein, a “Repayment Event” means any event or condition that gives the holder of any note, debenture or other evidence of indebtedness (or any person acting on such holder’s behalf) the right to require the repurchase, redemption or repayment of all or a portion of such indebtedness by the Guarantor or any of its subsidiaries (including the Company).

19. Absence of Proceedings. There is no action, suit, proceeding, inquiry or investigation before or brought by any court or governmental agency or body, domestic or foreign, now pending, or to the knowledge of the Company or the Guarantor threatened or contemplated, against or affecting the Guarantor or any of its subsidiaries (including the Company) that is required to be disclosed in the Registration Statement, the Disclosure Package or the Prospectus (other than as stated therein), or that would reasonably be expected to result in a Material Adverse Change, or that would reasonably be expected to materially and adversely affect the ability of the Company or the Guarantor to perform its obligations under this Agreement or the applicable Terms Agreement.

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20. Accuracy of Exhibits. There are no contracts or documents that are required to be described in the Registration Statement, the Disclosure Package, the Prospectus or the documents incorporated by reference therein or to be filed as exhibits thereto that have not been so described and filed as required.

21. Absence of Further Requirements. No consent, approval, authorization, or order of, or filing with, any governmental agency or body or any court, domestic or foreign, is required for the due authorization, execution or delivery by the Company or the Guarantor of this Underwriting Agreement or the applicable Terms Agreement or for the performance by the Company or the Guarantor of the transactions contemplated under the Prospectus, this Underwriting Agreement, such Terms Agreement or the applicable Indenture, as applicable, except such as have been obtained and made under the 1933 Act, such filing of the Prospectus as has been made with the Bermuda Registrar of Companies under the Companies Act 1981 of Bermuda and such as may be required under state securities laws.

22. Possession of Licenses and Permits. The Guarantor and its subsidiaries (including the Company) possess such permits, licenses, approvals, consents and other authorizations (collectively, “Governmental Licenses”) issued by the appropriate federal, state, local or foreign regulatory agencies or bodies necessary to conduct the business now operated by them, except where the failure to so possess any such Governmental Licenses would not, singly or in aggregate, reasonably be expected to result in a Material Adverse Change. The Guarantor and its subsidiaries (including the Company) are in compliance with the terms and conditions of all such Governmental Licenses, except where the failure so to comply would not, singly or in the aggregate, reasonably be expected to result in a Material Adverse Change. All of the Governmental Licenses are valid and in full force and effect, except where the invalidity of such Governmental Licenses or the failure of such Governmental Licenses to be in full force and effect would not reasonably be expected to result in a Material Adverse Change. Neither the Guarantor nor any of its subsidiaries (including the Company) has received any notice of proceedings relating to the revocation or modification of any such Governmental Licenses that, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would reasonably be expected to result in a Material Adverse Change.

23. Insurance Laws. Each of the Guarantor and its insurance subsidiaries (including insurance holding companies) is duly registered, licensed or admitted as an insurer or an insurance holding company (as applicable) in each jurisdiction where it is required to be so licensed or admitted to conduct its business as presently conducted, except where the failure to be so registered, licensed or admitted would not reasonably be expected to result in a Material Adverse Change; each of the Guarantor and its insurance subsidiaries has all other necessary authorizations, approvals, orders, certificates and permits, of and from, and has made all declarations and filings with, all insurance authorities, commissions or other insurance regulatory bodies to conduct their respective businesses as described in each of the Disclosure Package and the Prospectus, except for where the failure to have such authorizations, approvals, orders, certificates and permits, or to make such declarations and filings, would not reasonably be expected to result in a Material Adverse Change; all of such authorizations, approvals, orders, certificates and

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permits are in full force and effect, except where the failure to be in full force and effect would not reasonably be expected to result in a Material Adverse Change; and neither the Guarantor nor its insurance subsidiaries has received any notification from any insurance authority, commission or other insurance regulatory body to the effect that any additional authorization, approval, order, license, certificate or permit from such authority, commission or body is needed to be obtained by any of the Guarantor or its insurance subsidiaries, except for any authorization, approval, order, license, certificate or permit from any such authority, commission or body the failure of which to obtain, singly or in the aggregate, would not reasonably be expected to result in a Material Adverse Change.

Each of the Guarantor and its insurance subsidiaries is in compliance with all applicable insurance statutes and regulations and has filed all reports, documents or other information required to be filed under such statutes and regulations, except where the failure to comply or file would not reasonably be expected to result in a Material Adverse Change; and each of the Guarantor and its insurance subsidiaries is in compliance with the insurance laws and regulations of other jurisdictions which are applicable to the Guarantor and its insurance subsidiaries (as the case may be), except where the failure to comply would not reasonably be expected to result in a Material Adverse Change.

24. Governmental Authorization. Except as set forth in the Registration Statement, the Disclosure Package and the Prospectus, no authorization, approval or consent of any governmental authority or agency is required (other than any license as an insurer or insurance holding company and other than those that have already been obtained) under the laws of any jurisdiction in which the Guarantor or any of its subsidiaries (including the Company) conduct their respective businesses in connection with the ownership, directly or indirectly, by the Guarantor of equity interests in any subsidiary (including the Company) or the repatriation of any amount from or to the Guarantor or any of its subsidiaries (including the Company), except to the extent that the failure to obtain such authorization, approval or consent would not reasonably be expected to result in a Material Adverse Change.

25. Commodity Exchange Act. The Underwritten Securities, upon issuance, will be excluded or exempted under, or beyond the purview of, the Commodity Exchange Act, as amended (the “Commodity Exchange Act”), and the rules and regulations of the Commodity Futures Trading Commission under the Commodity Exchange Act.

26. Investment Company Act. The Company and the Guarantor are not, and upon the issuance and sale of the Underwritten Securities as herein contemplated and the application of the net proceeds therefrom as described in each of the Disclosure Package and the Prospectus they will not be, an “investment company” within the meaning of the Investment Company Act of 1940, as amended.

27. Internal Controls and Procedures. The Guarantor maintains a system of internal control over financial reporting (as such term is defined in Rule 13a-15(f) of the 1934 Act Regulations) designed by, or under the supervision of, the Company’s principal executive officer and principal financial officer to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for

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external purposes in accordance with generally accepted accounting principles. The Guarantor’s internal control over financial reporting was effective as of December 31, 2023, and the Guarantor was not aware of any material weaknesses in its internal control over financial reporting at such time.

B. Officers’ Certificates. Any certificate signed by any officer of the Company, the Guarantor or any of their respective subsidiaries and delivered to the Representative(s) or to counsel for the Underwriters in connection with the offering of the Underwritten Securities shall be deemed a representation and warranty by the Company, the Guarantor or such subsidiary, as the case may be, to each Underwriter as to the matters covered thereby on the date of such certificate and, unless subsequently amended or supplemented, at each Representation Date subsequent thereto.

II. Sale and Delivery to Underwriters; Closing.

A. Underwritten Securities. The several commitments of the Underwriters to purchase the Underwritten Securities pursuant to the applicable Terms Agreement shall be deemed to have been made on the basis of the representations, warranties and agreements herein contained and shall be subject to the terms and conditions herein set forth.

B. Payment. Payment of the purchase price for, and delivery of, the Underwritten Securities shall be made at the offices of Simpson Thacher & Bartlett LLP, 900 G Street NW, Washington, D.C. 20001, or at such other place as shall be agreed upon by the Representative(s) and the Company, at 9:00 A.M. (Eastern time) on the second (third, if the pricing occurs after 4:30 P.M. (Eastern time) on any given day), business day after the date of the applicable Terms Agreement (unless postponed in accordance with the provisions of Section 10 hereof), or such other time not later than ten business days after such date as shall be agreed upon by the Representative(s) and the Company (such time and date of payment and delivery being herein called “Closing Time”).

Payment shall be made to the Company by wire transfer of immediately available funds to a bank account designated by the Company, against delivery to the Representative(s) for the respective accounts of the Underwriters of the Underwritten Securities to be purchased by them. It is understood that each Underwriter has authorized the Representative(s), for its account, to accept delivery of, receipt for, and make payment of the purchase price for, the Underwritten Securities which it has severally agreed to purchase. Any Representative, individually and not as representative of the Underwriters, may (but shall not be obligated to) make payment of the purchase price for the Underwritten Securities to be purchased by any Underwriter whose funds have not been received by the Closing Time, but such payment shall not relieve such Underwriter from its obligations hereunder.

C. Denominations; Registration. If the Underwritten Securities are issued other than in book-entry form, certificates for the Underwritten Securities shall be in such denominations and registered in such names as the Representative(s) may request in writing at least one full business day prior to the Closing Time. If the Underwritten Securities are issued other than in book-entry form, certificates for the Underwritten Securities will be made available for examination and packaging by the Representative(s) in The City of New York not later than 10:00 A.M. (Eastern time) on the business day prior to the Closing Time.

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III. Covenants of the Company and the Guarantor. The Company and the Guarantor covenant with the Representative(s) and with each Underwriter participating in the offering of Underwritten Securities, as follows:

A. Compliance with Securities Regulations and Commission Requests; Payment of Filing Fees. The Company and the Guarantor, subject to Section 3(b) hereof, will comply with the requirements of Rule 430B of the 1933 Act Regulations, if and as applicable, and they will notify the Representative(s) immediately, and confirm the notice in writing, of (i) the filing and effectiveness of any post-effective amendment to the Registration Statement or the filing of any supplement or amendment to the Prospectus, (ii) the receipt of any comments from the Commission, (iii) any request by the Commission for any amendment to the Registration Statement or any amendment or supplement to the Prospectus or for additional information, (iv) the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or of any order preventing or suspending the use of any preliminary prospectus, or of the suspension of the qualification of the Underwritten Securities for offering or sale in any jurisdiction, or of the initiation or threatening of any proceedings for any of such purposes or of any examination pursuant to Section 8(e) of the 1933 Act concerning the Registration Statement and (v) if the Company or the Guarantor becomes the subject of a proceeding under Section 8A of the 1933 Act in connection with the offering of the Underwritten Securities. The Company and the Guarantor will effect the filings required under Rule 424(b) of the 1933 Act Regulations, in the manner and within the time period required by Rule 424(b) (without reliance on Rule 424(b)(8)), and will take such steps as they deem necessary to ascertain promptly whether each preliminary prospectus and the Prospectus transmitted for filing under Rule 424 of the 1933 Act Regulations was received for filing by the Commission and, in the event that it was not, they will promptly file such preliminary prospectus or the Prospectus. The Company and the Guarantor will make every reasonable effort to prevent the issuance of any stop order and, if any stop order is issued, to obtain the lifting thereof at the earliest possible moment. The Company and the Guarantor agree to pay the required Commission filing fees relating to the Underwritten Securities within the time required by Rule 456(b)(1) of the 1933 Act Regulations without regard to the proviso therein and otherwise in accordance with Rules 456(b) and 457(r) of the 1933 Act Regulations.

B. Filing of Amendments and Exchange Act Documents; Preparation of Final Term Sheet. The Company and the Guarantor will give the Representative(s) notice of their intention to file or prepare any amendment to the Registration Statement or any amendment, supplement or revision to either any preliminary prospectus or to the Prospectus, whether pursuant to the 1933 Act, the 1934 Act or otherwise, and the Company and the Guarantor will furnish the Representative(s) with copies of any such documents a reasonable amount of time prior to such proposed filing or use, as the case may be, and will give the Representative(s) a reasonable opportunity to comment on any such document prior to such proposed filing or use, as the case may be. The Company will prepare a final term sheet (the “Final Term Sheet”) reflecting the final terms of the Underwritten Securities, in form and substance satisfactory to the Representative(s) and attached as Schedule II to the applicable Terms Agreement, and shall file such Final Term Sheet as an “issuer free writing prospectus” pursuant to Rule 433 of the 1933 Act Regulations within the time required by such rule.

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C. Delivery of Registration Statements. The Company and the Guarantor have furnished or will deliver to the Representative(s) and counsel for the Underwriters, without charge, signed copies of the Registration Statement as originally filed and of each amendment thereto (including exhibits filed therewith or incorporated by reference therein and documents incorporated or deemed to be incorporated by reference therein or deemed to be a part thereof) and signed copies of all consents and certificates of experts, and will also deliver to the Representative(s), without charge, a conformed copy of the Registration Statement as originally filed and of each amendment thereto (without exhibits) for each of the Underwriters. The Registration Statement and each amendment thereto furnished to the Underwriters will be identical to any electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

D. Delivery of Prospectuses. The Company and the Guarantor will deliver to each Underwriter, without charge, as many copies of each preliminary prospectus and each Permitted Free Writing Prospectus (as defined below) as such Underwriter may reasonably request, and the Company and the Guarantor hereby consent to the use of such copies for purposes permitted by the 1933 Act. The Company and the Guarantor will furnish to each Underwriter, without charge, during the period when the Prospectus is required to be delivered under the 1933 Act or the 1934 Act, such number of copies of the Prospectus as such Underwriter may reasonably request. The Prospectus and any amendments or supplements thereto furnished to the Underwriters will be identical to any electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

E. Continued Compliance with Securities Laws. The Company and the Guarantor will comply with the 1933 Act, the 1933 Act Regulations, the 1934 Act and the 1934 Act Regulations so as to permit the completion of the distribution of the Underwritten Securities as contemplated in this Underwriting Agreement and the applicable Terms Agreement and in the Registration Statement and the Prospectus. If at any time when the Prospectus is required by the 1933 Act or the 1934 Act to be delivered in connection with sales of the Underwritten Securities, any event shall occur or condition shall exist as a result of which it is necessary, in the opinion of counsel for the Underwriters or for the Company and the Guarantor, to amend the Registration Statement in order that the Registration Statement will not contain an untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading or to amend or supplement the Prospectus in order that the Prospectus will not include an untrue statement of a material fact or omit to state a material fact necessary in order to make the statements therein not misleading in the light of the circumstances existing at the time it is delivered to a purchaser, or if it shall be necessary, in the opinion of such counsel, at any such time to amend the Registration Statement or amend or supplement the Prospectus in order to comply with the requirements of the 1933 Act or the 1933 Act Regulations, the Company and the Guarantor will promptly prepare and file with the Commission, at its own expense, subject to Section 3(b) hereof, such amendment or supplement as may be necessary to correct such statement or omission or to comply with such requirements, the Company and the Guarantor will use their best efforts to have such amendment declared effective as soon as practicable (if it is not automatically effective with respect to the

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Underwritten Securities), and the Company and the Guarantor will furnish to the Underwriters, without charge, such number of copies of such amendment or supplement as the Underwriters may reasonably request. Neither the Representative(s)’ consent to, nor any Underwriters’ delivery of, any such amendment or supplement shall constitute a waiver of any of the conditions set forth in Section 5 hereof. If at any time following issuance of an Issuer Free Writing Prospectus there occurred or occurs an event or development as a result of which such Issuer Free Writing Prospectus conflicted or would conflict with the information contained in the Registration Statement or the Prospectus or any preliminary prospectus or included or would include an untrue statement of a material fact or omitted or would omit to state a material fact necessary in order to make the statements therein, in the light of the circumstances prevailing at that subsequent time, not misleading, the Company and the Guarantor will promptly notify the Representative(s) and will promptly amend or supplement, at its own expense, such Issuer Free Writing Prospectus to eliminate or correct such conflict, untrue statement or omission and will promptly file such amendment or supplement with the Commission.

F. Blue Sky Qualifications. The Company and the Guarantor will use their best efforts, in cooperation with the Underwriters, to qualify the Underwritten Securities for offering and sale under the applicable securities laws of such states and other jurisdictions (domestic or foreign) as the Representative(s) may designate and to maintain such qualifications in effect for a period of not less than one year from the date of the applicable Terms Agreement; provided, however, that the Company and the Guarantor shall not be obligated to file any general consent to service of process or to qualify as a foreign corporation and/or foreign limited liability company or as a dealer in securities in any jurisdiction in which they are not so qualified or to subject themselves to taxation in respect of doing business in any jurisdiction in which they are not otherwise so subject. In each jurisdiction in which the Underwritten Securities have been so qualified, the Company and the Guarantor will file such statements and reports as may be required by the laws of such jurisdiction to continue such qualification in effect for a period of not less than one year from the date of such Terms Agreement.

G. Earnings Statement. The Guarantor and, to the extent separately required pursuant to Rule 158 of the 1933 Act Regulations, the Company will timely file such reports pursuant to the 1934 Act as are necessary in order to make generally available to its securityholders as soon as practicable an earnings statement for the purposes of, and to provide the benefits contemplated by, the last paragraph of Section 11(a) of the 1933 Act.

H. Use of Proceeds. The Company will use the net proceeds received by it from the sale of the Underwritten Securities in the manner specified under the caption “Use of Proceeds” in each of the Disclosure Package and the Prospectus. All of these net proceeds will be received outside Switzerland and will be used in a manner which will not constitute a detrimental use of proceeds in Switzerland for Swiss withholding tax purposes.

I. Listing. The Company and the Guarantor will use their best efforts to effect the listing of the Underwritten Securities, prior to the Closing Time, on any national securities exchange or quotation system if and as specified in the applicable Terms Agreement.

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J. Restriction on Sale of Debt Securities. Between the date of the applicable Terms Agreement and the Closing Time or such other date specified in such Terms Agreement, neither the Company nor the Guarantor will, without the prior written consent of the Representative(s), directly or indirectly, issue, sell, offer or contract to sell, grant any option for the sale of, or otherwise dispose of, the debt securities specified in such Terms Agreement.

K. Reporting Requirements. The Guarantor, during the period when the Prospectus is required to be delivered under the 1933 Act or the 1934 Act, will file all documents required to be filed with the Commission pursuant to the 1934 Act within the time periods required by the 1934 Act and the 1934 Act Regulations.

L. Documentary, Stamp or Similar Issue Taxes. The Company and the Guarantor will jointly and severally indemnify and hold harmless the Underwriters against any documentary, stamp or similar issue tax, including any interest and penalties, on the creation, issue and sale of the Underwritten Securities, on the execution and delivery of this Underwriting Agreement or the applicable Terms Agreement and on the resale and delivery by the Underwriters of the Underwritten Securities (including the Guarantee) contemplated by this Agreement. All payments to be made by the Company or the Guarantor hereunder shall be made without withholding or deduction for or on account of any present or future taxes, duties or governmental charges whatsoever unless the Company or the Guarantor is compelled by law to deduct or withhold such taxes, duties or charges. In that event, the Company or the Guarantor shall pay such additional amounts as may be necessary in order that the net amounts received after such withholding or deduction shall equal the amounts that would have been received if no withholding or deduction had been made. In addition to any amount payable by the Company or the Guarantor under this Agreement, the Company or the Guarantor (as the case may be) shall pay (and shall reimburse the Underwriters for) any value added tax or similar tax in respect of that amount.

M. Permitted Free Writing Prospectuses. Each of the Company and the Guarantor represents that it has not made, and agrees that, unless it obtains the prior written consent of the Representative(s), it will not make, any offer relating to the Underwritten Securities that would constitute an Issuer Free Writing Prospectus or that would otherwise constitute a “free writing prospectus” (as defined in Rule 405 of the 1933 Regulations) required to be filed by the Company or the Guarantor with the Commission or retained by the Company or the Guarantor under Rule 433 of the 1933 Act Regulations; provided that the prior written consent of the Representative(s) shall be deemed to have been given in respect of the free writing prospectuses listed in Schedule I to the applicable Terms Agreement. Any such free writing prospectus consented to by the Representative(s) is hereinafter referred to as a “Permitted Free Writing Prospectus”. Each of the Company and the Guarantor agrees that (i) it has treated and will treat, as the case may be, each Permitted Free Writing Prospectus as an Issuer Free Writing Prospectus, and (ii) has complied and will comply, as the case may be, with the requirements of Rules 164 and 433 of the 1933 Act Regulations applicable to any Permitted Free Writing Prospectus, including in respect of timely filing with the Commission, legending and record keeping. Each of the Company and the Guarantor consents to the use by any Underwriter of a free writing prospectus that (a) is not an “issuer free writing prospectus” as defined in Rule 433 of the 1933 Act Regulations, and (b) contains only (i) information describing the preliminary terms of the Underwritten Securities or their offering, (ii) information permitted by Rule 134 of the 1933 Act Regulations or (iii) information that describes the final terms of the Underwritten Securities or their offering and that is included in the Final Term Sheet.

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N. Registration Statement Renewal Deadline. If immediately prior to the third anniversary (the “Renewal Deadline”) of the initial effective date of the Registration Statement, any of the Underwritten Securities remain unsold by the Underwriters, the Company and the Guarantor will prior to the Renewal Deadline file, if it has not already done so and is eligible to do so, a new automatic shelf registration statement relating to the Underwritten Securities, in a form satisfactory to the Representative(s). If the Company or the Guarantor is no longer eligible to file an automatic shelf registration statement, the Company and the Guarantor will prior to the Renewal Deadline, if it has not already done so, file a new shelf registration statement relating to the Underwritten Securities, in a form satisfactory to the Representative(s), and will use its best efforts to cause such registration statement to be declared effective within 60 days after the Renewal Deadline. The Company and the Guarantor will take all other action necessary or appropriate to permit the public offering and sale of the Underwritten Securities to continue as contemplated in the expired registration statement relating to the Underwritten Securities. References herein to the Registration Statement shall include such new automatic shelf registration statement or such new shelf registration statement, as the case may be.

O. Notice of Inability to Use Automatic Shelf Registration Statement Form. If at any time when Underwritten Securities remain unsold by the Underwriters either the Company or the Guarantor receives from the Commission a notice pursuant to Rule 401(g)(2) of the 1933 Act Regulations or otherwise ceases to be eligible to use the automatic shelf registration statement form, the Company or the Guarantor will (i) promptly notify the Representative(s), (ii) promptly file a new registration statement or post-effective amendment on the proper form relating to the Underwritten Securities, in a form satisfactory to the Representative(s), (iii) use its best efforts to cause such registration statement of post-effective amendment to be declared effective and (iv) promptly notify the Representative(s) of such effectiveness. The Company and the Guarantor will take all other action necessary or appropriate to permit the public offering and sale of the Underwritten Securities to continue as contemplated in the registration statement that was the subject of the Rule 401(g)(2) notice or for which the Company or the Guarantor has otherwise become ineligible. References herein to the Registration Statement shall include such new registration statement or post-effective amendment, as the case may be.

IV. Payment of Expenses.

A. Expenses. The Company and the Guarantor will pay all expenses incidental to the performance of their obligations under this Underwriting Agreement or the applicable Terms Agreement, including (i) the preparation, printing and filing of the Registration Statement (including financial statements and exhibits) as originally filed and of each amendment thereto, (ii) the preparation, printing and delivery to the Underwriters of this Underwriting Agreement, any Terms Agreement, any agreement among Underwriters, the Indentures, and such other documents as may be required in connection with the offering, purchase, sale, issuance or delivery of the Underwritten Securities, (iii) the preparation, issuance and delivery of the Underwritten Securities and any certificates for the Underwritten Securities, to the Underwriters, including any transfer taxes and any stamp or other duties payable upon the sale, issuance or delivery of the Underwritten Securities to the Underwriters (including any charges of Euroclear or Clearstream in connection therewith), (iv) the fees and disbursements of the Company’s and the Guarantor’s counsel, accountants and other advisors or agents (including transfer agents and registrars), as well as the separately agreed fees and disbursements of the Trustees, and their

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respective counsel, (v) the qualification of the Underwritten Securities under state securities laws in accordance with the provisions of Section 3(f) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection therewith and in connection with the preparation, printing and delivery of the Blue Sky Survey, and any amendment thereto, (vi) the printing and delivery to the Underwriters and filing of copies of each preliminary prospectus, the Prospectus, any free writing prospectus and any amendments or supplements thereto, (vii) the fees charged by Rating Organizations (as defined below) for the rating of the Underwritten Securities, if applicable, (viii) the fees and expenses incurred with respect to the listing of the Underwritten Securities, if applicable, (ix) the filing fees incident to, and the reasonable fees and disbursements of counsel to the Underwriters in connection with, the review, if any, by the Financial Industry Regulatory Authority, Inc. (the “FINRA”) of the terms of the sale of the Underwritten Securities, and (x) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the offering of the Underwritten Securities, including, without limitation, expenses associated with the preparation or dissemination of any electronic road show, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations with the prior approval of the Company, travel and lodging expenses of the representatives and officers of the Company and any such consultants. Except as provided in this Underwriting Agreement or the applicable Terms Agreement, the Underwriters shall pay their own expenses, including the fees and disbursements of their counsel.

B. Termination of Agreement. If the applicable Terms Agreement is terminated by the Representative(s) in accordance with the provisions of Section 5 or Section 9(a)(i) or 9(a)(ii) hereof, the Company and the Guarantor shall reimburse the Underwriters for all of their out-of-pocket expenses, including the reasonable fees and disbursements of counsel for the Underwriters.

V. Conditions of Underwriters’ Obligations. The obligations of the Underwriters to purchase and pay for the Underwritten Securities pursuant to the applicable Terms Agreement are subject to the accuracy of the representations and warranties of the Company and the Guarantor contained in Section 1(a) hereof or in certificates of any officer of the Company, the Guarantor or any of their respective subsidiaries delivered pursuant to the provisions hereof, to the performance by the Company and the Guarantor of their covenants and other obligations hereunder, and to the following further conditions:

A. Effectiveness of Registration Statement; Filings. The Registration Statement has become effective under the 1933 Act; no stop order suspending the effectiveness of the Registration Statement shall have been issued under the 1933 Act and no proceedings for that purpose shall have been instituted or be pending or threatened by the Commission; any request on the part of the Commission for additional information shall have been complied with to the reasonable satisfaction of counsel to the Underwriters; no notice pursuant to Rule 401(g)(2) of the 1933 Act Regulations shall have been received by the Company or the Guarantor objecting to the use of the automatic shelf registration statement form; the Registration Statement is not the subject of a pending proceeding or examination under Section 8(d) or 8(e) of the 1933 Act, and neither the Company nor the Guarantor is the subject of a pending proceeding under Section 8A of the 1933 Act in connection with the offering of the Underwritten Securities. Each preliminary

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prospectus and the Prospectus shall have been filed with the Commission (including the information required by Rule 430B of the 1933 Act Regulations) in the manner and within the time period required by Rule 424(b) of the 1933 Act Regulations without reliance on Rule 424(b)(8) of the 1933 Act Regulations, or a post-effective amendment to the Registration Statement containing the information required by such Rule 430B shall have been filed, and such post-effective amendment shall have become effective. The Final Term Sheet and any other material required to be filed by the Company or the Guarantor pursuant to Rule 433(d) of the 1933 Act Regulations shall have been filed with the Commission within the applicable time periods prescribed for such filings under such Rule 433.

B. Opinions of Counsel for Company and Guarantor. At Closing Time, the Representative(s) shall have received the favorable opinions, each dated as of Closing Time, of Bär & Karrer AG, Swiss counsel for the Guarantor, the Guarantor’s General Counsel, and Mayer Brown LLP, United States counsel for the Company and the Guarantor, in form and substance satisfactory to counsel for the Underwriters, together with signed or reproduced copies of such letters for each of the other Underwriters, to the effect set forth in: Exhibit B hereto with respect to the opinion of Bär & Karrer AG; Exhibit C hereto with respect to the opinion of the Guarantor’s General Counsel; and Exhibit D hereto with respect to the opinion of Mayer Brown LLP, and, as to each opinion, to such further effect as the Underwriters may reasonably request.

C. Opinion of Counsel for Underwriters. At Closing Time, the Representative(s) shall have received the favorable opinion, dated as of Closing Time, of Simpson Thacher & Bartlett LLP, counsel for the Underwriters, in form and substance reasonably satisfactory to the Underwriters, together with signed or reproduced copies of such letter for each of the other Underwriters. In giving such opinion, such counsel may rely, as to all matters governed by the laws of jurisdictions other than the law of the State of New York, the federal law of the United States and the Limited Liability Company Act of the State of Delaware, upon the opinions of counsel satisfactory to the Representative(s). Such counsel may also state that, insofar as such opinion involves factual matters, they have relied, to the extent they deem proper, upon certificates of officers of the Company, the Guarantor and their respective subsidiaries and certificates of public officials.

D. Company Officers’ Certificate. At Closing Time, the Representative(s) shall have received a certificate of the President, a Vice President or the Treasurer of the Company and of the chief financial officer or chief accounting officer of the Company, dated as of Closing Time, to the effect that (i) there has not been, since the date of the applicable Terms Agreement or since the respective dates as of which information is given in the Disclosure Package or the Prospectus, any material adverse change, or any development or event involving a prospective material adverse change, in the financial condition, business or results of operations of the Company and its subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business, (ii) the representations and warranties of the Company in Section 1(a) hereof are true and correct with the same force and effect as though expressly made at and as of the Closing Time, (iii) the Company has complied with all agreements and satisfied all conditions on its part to be performed or satisfied at or prior to the Closing Time, and (iv) no stop order suspending the effectiveness of the Registration Statement has been issued and no proceedings for that purpose have been instituted, are pending or, to the best of such officer’s knowledge, are threatened by the Commission.

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E. Guarantor Officers’ Certificate. At Closing Time, the Representative(s) shall have received a certificate of either the Chairman, the President and Chief Executive Officer, the General Counsel and Secretary of the Guarantor or the Chief Administration Officer – Bermuda and of either the chief financial officer, chief accounting officer, chief investment officer or Chief Financial Officer of Chubb Switzerland of the Guarantor, dated as of Closing Time, to the effect that, to the best of their knowledge and after reasonable investigation, (i) there has not been, since the date of the applicable Terms Agreement or since the respective dates as of which information is given in the Disclosure Package or the Prospectus, any material adverse change, or any development or event involving a prospective material adverse change, in the financial condition, business or results of operations of the Guarantor and its subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business, (ii) the representations and warranties of the Guarantor in Section 1(a) hereof are true and correct with the same force and effect as though expressly made at and as of the Closing Time, (iii) the Guarantor has complied with all agreements and satisfied all conditions on its part to be performed or satisfied at or prior to the Closing Time, and (iv) no stop order suspending the effectiveness of the Registration Statement has been issued and no proceedings for that purpose have been instituted, are pending or are threatened by the Commission.

F. Accountant’s Comfort Letter. At the time of the execution of the applicable Terms Agreement, the Representative(s) shall have received from PricewaterhouseCoopers LLP, independent public accountants of the Guarantor and its subsidiaries, a letter, dated as of the date of the applicable Terms Agreement, in form and substance satisfactory to the Representative(s), together with signed or reproduced copies of such letter for each of the other Underwriters, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements (including any pro forma financial statements) and certain financial information contained in the Registration Statement, the preliminary prospectus or prospectuses that are part of the Disclosure Package and the Prospectus.

G. Bring-down Comfort Letter. At Closing Time, the Representative(s) shall have received from PricewaterhouseCoopers LLP a letter, dated as of Closing Time, to the effect that it reaffirms the statements made in the letter furnished pursuant to Section 5(f) hereof, except that the specified date referred to shall be a date not more than three business days prior to the Closing Time.

H. Ratings. At Closing Time, the Underwritten Securities shall have the ratings accorded by any “nationally recognized statistical rating organization”, as defined by the Commission in Section 3(a)(62) of the 1934 Act (each, a “Rating Organization”), if and as specified in the applicable Terms Agreement, and the Company and the Guarantor shall have delivered to the Representative(s) a letter, dated on or around such date, from each such rating organization, or other evidence satisfactory to the Representative(s), confirming that the Underwritten Securities have such ratings. Since the time of execution of such Terms Agreement, there shall not have occurred a downgrading in, or withdrawal of, the rating assigned to the Underwritten Securities or any of the Guarantor’s other securities or the Guarantor’s financial strength or claims paying ability by any such Rating Organization, and no such Rating Organization shall have publicly announced that it has under surveillance or review with negative implications its rating of the Underwritten Securities or any of the Guarantor’s other securities or the Guarantor’s financial strength or claims paying ability.

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I. Approval of Listing. At Closing Time, the Underwritten Securities shall have been approved for listing, subject only to official notice of issuance, on the securities exchanges, if any, specified in the applicable Terms Agreement.

J. Additional Documents. At Closing Time, counsel for the Underwriters shall have been furnished with such documents and opinions as they may require for the purpose of enabling them to pass upon the issuance and sale of the Underwritten Securities as herein contemplated, or in order to evidence the accuracy of any of the representations or warranties, or the fulfillment of any of the conditions, herein contained; and all proceedings taken by the Company and the Guarantor in connection with the issuance and sale of the Underwritten Securities and the Guarantee as herein contemplated shall be satisfactory in form and substance to the Representative(s) and counsel for the Underwriters.

K. Termination of Terms Agreement. If any condition specified in this Section 5 shall not have been fulfilled when and as required to be fulfilled, the applicable Terms Agreement may be terminated by the Representative(s) by notice to the Company and the Guarantor at any time at or prior to the Closing Time, and such termination shall be without liability of any party to any other party except as provided in Section 4 hereof and except that Sections 1, 6, 7 and 8 hereof shall survive any such termination and remain in full force and effect.

VI. Indemnification.

A. Indemnification of Underwriters. The Company and the Guarantor agree to jointly and severally indemnify and hold harmless each Underwriter and each person, if any, who controls any Underwriter within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act as follows:

(1) against any and all loss, liability, claim, damage and expense whatsoever, as incurred, arising out of any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement (or any amendment thereto), including the Rule 430B Information deemed to be a part thereof, or the omission or alleged omission therefrom of a material fact required to be stated therein or necessary to make the statements therein not misleading or arising out of any untrue statement or alleged untrue statement of a material fact included in any preliminary prospectus, the Prospectus (or any amendment or supplement thereto), any Issuer Free Writing Prospectus, any “road show” as defined in Rule 433(h) of the 1933 Act Regulations (a “road show”) or the information contained in the Final Term Sheet, or the omission or alleged omission therefrom of a material fact necessary in order to make the statements therein, in the light of the circumstances under which they were made, not misleading;

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(2) against any and all loss, liability, claim, damage and expense whatsoever, as incurred, to the extent of the aggregate amount paid in settlement of any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever based upon any such untrue statement or omission, or any such alleged untrue statement or omission; provided that (subject to Section 6(d) hereof) any such settlement is effected with the written consent of the Company and the Guarantor; and

(3) against any and all expense whatsoever, as incurred (including the fees and disbursements of counsel chosen by the Representative(s)), reasonably incurred in investigating, preparing or defending against any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever based upon any such untrue statement or omission, or any such alleged untrue statement or omission, to the extent that any such expense is not paid under (1) or (2) above;

provided, however, that this indemnity agreement shall not apply to any loss, liability, claim, damage or expense to the extent arising out of any untrue statement or omission or alleged untrue statement or omission made in reliance upon and in conformity with written information furnished to the Company or the Guarantor by any Underwriter through the Representative(s) expressly for use in the Registration Statement (or any amendment thereto), including the Rule 430B Information deemed to be a part thereof or any preliminary prospectus or the Prospectus (or any amendment or supplement thereto).

B. Indemnification of Company, Guarantor, Directors and Officers. Each Underwriter severally and not jointly agrees to indemnify and hold harmless the Company, the Guarantor, their respective directors, each of their respective officers who signed the Registration Statement, and each person, if any, who controls the Company or the Guarantor within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act against any and all loss, liability, claim, damage and expense described in the indemnity contained in Section 6(a) hereof, as incurred, but only with respect to untrue statements or omissions, or alleged untrue statements or omissions, made in the Registration Statement (or any amendment thereto), including the Rule 430B Information deemed to be a part thereof or any preliminary prospectus or the Prospectus (or any amendment or supplement thereto) in reliance upon and in conformity with written information furnished to the Company or the Guarantor by such Underwriter through the Representative(s) expressly for use in the Registration Statement (or any amendment thereto) or such preliminary prospectus or the Prospectus (or any amendment or supplement thereto).

C. Actions against Parties; Notification. Each indemnified party shall give notice as promptly as reasonably practicable to each indemnifying party of any action commenced against it in respect of which indemnity may be sought hereunder, but failure to so notify an indemnifying party shall not relieve such indemnifying party from any liability hereunder to the extent it is not materially prejudiced as a result thereof and in any event shall not relieve it from any liability which it may have otherwise than on account of this indemnity agreement. In the case of parties indemnified pursuant to Section 6(a) hereof, counsel to the indemnified parties shall be selected by the Representative(s), and, in the case of parties indemnified pursuant to Section 6(b) hereof, counsel to the indemnified parties shall be selected by the Guarantor. An indemnifying party may participate at its own expense in the defense of any such action; provided, however, that counsel to the indemnifying party shall not (except with the consent of the indemnified party) also be counsel to the indemnified party. In no event shall the

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indemnifying parties be liable for fees and expenses of more than one counsel (in addition to any local counsel) separate from their own counsel for all indemnified parties in connection with any one action or separate but similar or related actions in the same jurisdiction arising out of the same general allegations or circumstances. No indemnifying party shall, without the prior written consent of the indemnified parties, settle or compromise or consent to the entry of any judgment with respect to any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever in respect of which indemnification or contribution could be sought under this Section 6 or Section 7 hereof (whether or not the indemnified parties are actual or potential parties thereto), unless such settlement, compromise or consent (i) includes an unconditional release of each indemnified party from all liability arising out of such litigation, investigation, proceeding or claim and (ii) does not include a statement as to or an admission of fault, culpability or a failure to act by or on behalf of any indemnified party.

D. Settlement without Consent if Failure to Reimburse. If at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel, such indemnifying party agrees that it shall be liable for any settlement of the nature contemplated by Section 6(a)(2) hereof effected without its written consent if (i) such settlement is entered into more than 45 days after receipt by such indemnifying party of the aforesaid request, (ii) such indemnifying party shall have received notice of the terms of such settlement at least 30 days prior to such settlement being entered into and (iii) such indemnifying party shall not have reimbursed such indemnified party in accordance with such request prior to the date of such settlement.

VII. Contribution. If the indemnification provided for in Section 6 hereof is for any reason unavailable to or insufficient to hold harmless an indemnified party in respect of any losses, liabilities, claims, damages or expenses referred to therein, then each indemnifying party shall contribute to the aggregate amount of such losses, liabilities, claims, damages and expenses incurred by such indemnified party, as incurred, (i) in such proportion as is appropriate to reflect the relative benefits received by the Company and the Guarantor, on the one hand, and the Underwriters, on the other hand, from the offering of the Underwritten Securities pursuant to the applicable Terms Agreement or (ii) if the allocation provided by clause (i) is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause (i) above but also the relative fault of the Company and the Guarantor, on the one hand, and the Underwriters, on the other hand, in connection with the statements or omissions which resulted in such losses, liabilities, claims, damages or expenses, as well as any other relevant equitable considerations.

The relative benefits received by the Company and the Guarantor, on the one hand, and the Underwriters, on the other hand, in connection with the offering of the Underwritten Securities pursuant to the applicable Terms Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the offering of such Underwritten Securities (before deducting expenses) received by the Company and the total underwriting discount received by the Underwriters, in each case as set forth on the cover of the Prospectus bear to the aggregate initial public offering price of such Underwritten Securities as set forth on such cover.

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The relative fault of the Company and the Guarantor, on the one hand, and the Underwriters, on the other hand, shall be determined by reference to, among other things, whether any such untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by the Company or the Guarantor or by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

The Company, the Guarantor and the Underwriters agree that it would not be just and equitable if contribution pursuant to this Section 7 were determined by pro rata allocation (even if the Underwriters were treated as one entity for such purpose) or by any other method of allocation which does not take account of the equitable considerations referred to above in this Section 7. The aggregate amount of losses, liabilities, claims, damages and expenses incurred by an indemnified party and referred to above in this Section 7 shall be deemed to include any legal or other expenses reasonably incurred by such indemnified party in investigating, preparing or defending against any litigation, or any investigation or proceeding by any governmental agency or body, commenced or threatened, or any claim whatsoever based upon any such untrue or alleged untrue statement or omission or alleged omission.

Notwithstanding the provisions of this Section 7, no Underwriter shall be required to contribute any amount in excess of the amount by which the total price at which the Underwritten Securities underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages which such Underwriter has otherwise been required to pay by reason of any such untrue or alleged untrue statement or omission or alleged omission.

No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the 1933 Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation.

For purposes of this Section 7, each person, if any, who controls an Underwriter within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act shall have the same rights to contribution as such Underwriter, and each director of the Company and the Guarantor, each officer of the Company and the Guarantor who signed the Registration Statement, and each person, if any, who controls the Company or the Guarantor within the meaning of Section 15 of the 1933 Act or Section 20 of the 1934 Act shall have the same rights to contribution as the Company and the Guarantor. The Underwriters’ respective obligations to contribute pursuant to this Section 7 are several in proportion to the aggregate principal amount of Underwritten Securities set forth opposite their respective names in the applicable Terms Agreement, and not joint.

VIII. Representations, Warranties and Agreements to Survive Delivery. All representations, warranties and agreements contained in this Underwriting Agreement or the applicable Terms Agreement or in certificates of officers of the Company, the Guarantor or any of their respective subsidiaries submitted pursuant hereto or thereto shall remain operative and in full force and effect, regardless of any investigation made by or on behalf of any Underwriter or controlling person, or by or on behalf of the Company or the Guarantor, and shall survive delivery of and payment for the Underwritten Securities.

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IX. Termination.

A. Terms Agreement. The Representative(s) may terminate this Agreement and the applicable Terms Agreement, by notice to the Company and the Guarantor, at any time at or prior to the Closing Time, if (i) there has been, since the time of execution of such Terms Agreement or since the respective dates as of which information is given in the Disclosure Package or the Prospectus, any material adverse change, or any development or event involving a prospective material adverse change, in the financial condition, business or results of operations of the Company and its subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business, (ii) there has been, since the time of execution of such Terms Agreement or since the respective dates as of which information is given in the Prospectus, any material adverse change, or any development or event involving a prospective material adverse change, in the financial condition, business or results of operations of the Guarantor and its subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business, (iii) there has occurred any material adverse change in the financial markets in the United States or Europe or any outbreak of hostilities or escalation thereof or other calamity or crisis or any change or development involving a prospective change in national or international political, financial or economic conditions, in each case referred to in this clause (iii), the effect of which is such as to make it, in the judgment of the Representative(s), impracticable or inadvisable to market the Underwritten Securities or to enforce contracts for the sale of the Underwritten Securities, (iv) any downgrading in the rating of any debt securities of the Guarantor or the Company or the insurance claims paying ability rating or other insurance rating of the Guarantor or any of its Significant Subsidiaries, in each case by any Rating Organization, or any public announcement that any such organization has under surveillance or review its rating of any debt securities of the Guarantor or the Company (other than an announcement with positive implications of a possible upgrading, and no implication of a possible downgrading, of such rating) or of the insurance claims paying ability or other insurance rating of the Guarantor or any of its Significant Subsidiaries, (v) trading in any securities of the Company or the Guarantor has been suspended or materially limited by the Commission or the New York Stock Exchange (“NYSE”), or if trading generally on the NYSE or the NYSE MKT or in the Nasdaq Global Market has been suspended or materially limited, or minimum or maximum prices for trading have been fixed, or maximum ranges for prices have been required, by either of said exchanges or by such system or by order of the Commission, the FINRA or any other governmental authority or a material disruption has occurred in commercial banking or securities settlement or clearance services in the United States or (vi) a banking moratorium has been declared by either U.S. Federal, New York or Bermuda authorities or, if the Underwritten Securities are denominated or payable in, or indexed to, one or more foreign or composite currencies, by the relevant authorities in the related foreign country or countries.

B. Liabilities. If this Underwriting Agreement or the applicable Terms Agreement is terminated pursuant to this Section 9, such termination shall be without liability of any party to any other party except as provided in Section 4 hereof, and provided that Sections 1, 6, 7 and 8 hereof shall survive such termination and remain in full force and effect.

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X. Default by One or More of the Underwriters. If one or more of the Underwriters shall (including due to the exercise of Statutory Loss Absorption Powers described in Section 17 hereof) fail at the Closing Time to purchase the Underwritten Securities which it or they are obligated to purchase under the applicable Terms Agreement (the “Defaulted Securities”), then the Representative(s) shall have the right, within 24 hours thereafter, to make arrangements for one or more of the non-defaulting Underwriters, or any other underwriters, to purchase all, but not less than all, of the Defaulted Securities in such amounts as may be agreed upon and upon the terms herein set forth; if, however, the Representative(s) shall not have completed such arrangements within such 24-hour period, then:

(a) if the number or aggregate principal amount, as the case may be, of Defaulted Securities does not exceed 10% of the number or aggregate principal amount, as the case may be, of Underwritten Securities to be purchased on such date pursuant to such Terms Agreement, the non-defaulting Underwriters shall be obligated, severally and not jointly, to purchase the full amount thereof in the proportions that their respective underwriting obligations under such Terms Agreement bear to the underwriting obligations of all non-defaulting Underwriters, or

(b) if the number or aggregate principal amount, as the case may be, of Defaulted Securities exceeds 10% of the number or aggregate principal amount, as the case may be, of Underwritten Securities to be purchased on such date pursuant to such Terms Agreement, such Terms Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

No action taken pursuant to this Section 10 shall relieve any defaulting Underwriter (or any Underwriter no longer obligated to purchase the Underwritten Securities in accordance with the exercise of Statutory Loss Absorption Powers described in Section 17 hereof) from liability in respect of its failure or default.

In the event of any such failure or default which does not result in a termination of the applicable Terms Agreement, either the Representative(s) or the Company shall have the right to postpone the Closing Time for a period not exceeding seven days in order to effect any required changes in the Registration Statement, the Disclosure Package or the Prospectus or in any other documents or arrangements.

XI. Notices. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly given if mailed or transmitted by any standard form of telecommunication. Notices to the Underwriters shall be directed to the Representative(s) at the address specified in the applicable Terms Agreement; notices to the Company shall be directed to it at 436 Walnut Street, Philadelphia, PA 19106, attention of Global Treasurer, with a copy to Chubb Group Holdings Inc., 550 Madison Avenue, New York, New York 10022, attention of General Counsel; and notices to the Guarantor shall be directed to it at Bärengasse 32, CH-8001 Zurich, Switzerland, attention of General Counsel and Secretary, with a copy to Chubb Group Holdings Inc., 550 Madison Avenue, New York, New York 10022, attention of General Counsel.

XII. Parties. This Underwriting Agreement and the applicable Terms Agreement shall each inure to the benefit of and be binding upon the Company and the Guarantor and, upon execution of such Terms Agreement, any Underwriters named therein and their respective successors. Nothing expressed or mentioned in this Underwriting Agreement or such Terms Agreement is intended or shall be construed to give any person, firm or corporation, other than

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the Underwriters, the Company, the Guarantor and their respective successors and the controlling persons and officers and directors referred to in Sections 6 and 7 hereof and their heirs and legal representatives, any legal or equitable right, remedy or claim under or in respect of this Underwriting Agreement or such Terms Agreement or any provision herein or therein contained. This Underwriting Agreement and such Terms Agreement and all conditions and provisions hereof and thereof are intended to be for the sole and exclusive benefit of the parties hereto and thereto and their respective successors, and said controlling persons and officers and directors and their heirs and legal representatives, and for the benefit of no other person, firm or corporation. No purchaser of Underwritten Securities from any Underwriter shall be deemed to be a successor by reason merely of such purchase.

XIII. Consent to Jurisdiction; Miscellaneous. Each of the parties hereto hereby expressly and irrevocably submits to the non-exclusive jurisdiction of any competent court in the place of its domicile and any United States Federal or New York State court sitting in the Borough of Manhattan in The City of New York in any action, suit or proceeding arising out of or relating to this Underwriting Agreement or the applicable Terms Agreement or the transactions contemplated hereby or thereby to the extent that such court has subject matter jurisdiction over the controversy, and expressly and irrevocably waives, to the extent permitted under applicable law, any immunity from the jurisdiction thereof and any claim or defense in such action, suit or proceeding based on a claim of improper venue, forum non conveniens or any similar basis to which it might otherwise be entitled in any such action, suit or proceeding. Each of the Company and the Guarantor irrevocably appoints Chubb Group Holdings Inc., 550 Madison Avenue, New York, New York 10022, as its authorized agent in the Borough of Manhattan in The City of New York upon which process may be served in any such action, suit or proceeding, and agrees that service of process upon such agent, and written notice of said service to the Company or the Guarantor by the person serving the same to the address provided in Section 11 hereof, shall be deemed in every respect effective service of process upon the Company or the Guarantor, as the case may be, in any such action, suit or proceeding. Each of the Company and the Guarantor further agrees to take any and all action as may be necessary to maintain such designation and appointment of such agent in full force and effect for a period of seven years from the date of this Underwriting Agreement.

XIV. Waiver of Immunities. To the extent that the Company or the Guarantor or any of their respective properties, assets or revenues may have or may hereafter become entitled to, or have attributed to them, any right of immunity, on the grounds of sovereignty, from any legal action, suit or proceeding, from set-off or counterclaim, from the jurisdiction of any court, from service of process, from attachment upon or prior to judgment, or from attachment in aid of execution of judgment, or from execution of judgment, other legal process or proceeding for the giving of any relief or for the enforcement of any judgment, in any jurisdiction in which proceedings may at any time be commenced, with respect to their obligations, liabilities or any other matter under or arising out of or in connection with this Underwriting Agreement or any additional agreement, each of the Company and the Guarantor hereby irrevocably and unconditionally, to the extent permitted by applicable law, waives and agrees not to plead or claim any such immunity and consents to such relief and enforcement.

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XV. Judgment Currency. The Company and the Guarantor jointly and severally agree to indemnify each Underwriter against any loss incurred by such Underwriter as a result of any judgment or order being given or made for any amount due hereunder and such judgment or order being expressed and paid in a currency (the “Judgment Currency”) other than the United States dollar and as a result of any variation as between (i) the rate of exchange at which the United States dollar amount is converted into the Judgment Currency for the purpose of such judgment or order, and (ii) the rate of exchange at which such Underwriter is able to purchase United States dollars with the amount of the Judgment Currency actually received by such Underwriter. The foregoing indemnity shall constitute a separate and independent obligation of each of the Company and the Guarantor and shall continue in full force and effect notwithstanding any such judgment or order as aforesaid. The term “rate of exchange” shall include any premiums and costs of exchange payable in connection with the purchase of, or conversion into, the relevant currency.

XVI. No Advisory or Fiduciary Responsibility. The Company and the Guarantor acknowledge and agree that (i) the purchase and issuance of the Underwritten Securities pursuant to this Agreement is an arm’s-length commercial transaction between the Company and the Guarantor, on the one hand, and the several Underwriters, on the other, (ii) in connection therewith and with the process leading to such transaction each Underwriter is acting solely as a principal and not the agent or fiduciary of the Company or the Guarantor, (iii) no Underwriter has assumed an advisory or fiduciary responsibility in favor of the Company or the Guarantor with respect to the offering contemplated hereby or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company or the Guarantor on other matters) or any other obligation to the Company or the Guarantor except the obligations expressly set forth in this Agreement and (iv) the Company and the Guarantor have consulted their own legal and financial advisors to the extent they deemed appropriate. The Company and the Guarantor agree that they will not claim that the Underwriters, or any of them, has rendered advisory services of any nature or respect, or owes a fiduciary or similar duty to the Company or the Guarantor, in connection with such transaction or the process leading thereto.

XVII. Contractual Recognition of UK Bail-in. Notwithstanding and to the exclusion of any other term of this Agreement or any other agreements, arrangements, or understanding between any of the parties hereto, each of the parties acknowledges, accepts and agrees that any UK Bail-in Liability of a UK Bail-in Party hereto arising under this Agreement may be subject to the exercise of UK Bail-in Powers by the Relevant UK Resolution Authority, and acknowledges, accepts and agrees to be bound by:

(a) the effect of the exercise of UK Bail-in Powers by the Relevant UK Resolution Authority in relation to any UK Bail-in Liability of any UK Bail-in Party to it under this Agreement, that (without limitation) may include and result in any of the following, or some combination thereof:

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(b) the variation of the terms of this Agreement, as deemed necessary by the Relevant UK Resolution Authority, to give effect to the exercise of UK Bail-in Powers by the Relevant UK Resolution Authority.

Where:

“UK Bail-in Legislation” means Part I of the UK Banking Act 2009 and any other law or regulation applicable in the United Kingdom relating to the resolution of unsound or failing banks, investment firms or other financial institutions or their affiliates (otherwise than through liquidation, administration or other insolvency proceedings).

“UK Bail-in Liability” means a liability in respect of which the UK Bail-in Powers may be exercised.

“UK Bail-in Party” means any party hereto that is subject to UK Bail-in Powers.

“UK Bail-in Powers” means the powers under the UK Bail-in Legislation to cancel, transfer or dilute shares issued by a person that is a bank or investment firm or affiliate of a bank or investment firm, to cancel, reduce, modify or change the form of a liability of such a person or any contract or instrument under which that liability arises, to convert all or part of that liability into shares, securities or obligations of that person or any other person, to provide that any such contract or instrument is to have effect as if a right had been exercised under it or to suspend any obligation in respect of that liability.

“Relevant UK Resolution Authority” means, in relation to any BRRD Party, the resolution authority with the ability to exercise any UK Bail-in Powers as defined in this Section 17.

XVIII. Recognition of the U.S. Special Resolution Regimes.

A. In the event that any Underwriter that is a Covered Entity becomes subject to a proceeding under a U.S. Special Resolution Regime, the transfer from such Underwriter of this Agreement, and any interest and obligation in or under this Agreement, will be effective to the same extent as the transfer would be effective under the U.S. Special Resolution Regime if this Agreement, and any such interest and obligation, were governed by the laws of the United States or a state of the United States.

B. In the event that any Underwriter that is a Covered Entity or a BHC Act Affiliate of such Underwriter becomes subject to a proceeding under a U.S. Special Resolution Regime, Default Rights under this Agreement that may be exercised against such Underwriter are permitted to be exercised to no greater extent than such Default Rights could be exercised under the U.S. Special Resolution Regime if this Agreement were governed by the laws of the United States or a state of the United States.

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As used in this Section 18:

“BHC Act Affiliate” has the meaning assigned to the term “affiliate” in, and shall be interpreted in accordance with, 12 U.S.C. § 1841(k).

“Covered Entity” means any of the following:

“Default Right” has the meaning assigned to that term in, and shall be interpreted in accordance with, 12 C.F.R. §§ 252.81, 47.2 or 382.1, as applicable.

“U.S. Special Resolution Regime” means each of (i) the Federal Deposit Insurance Act and the regulations promulgated thereunder and (ii) Title II of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations promulgated thereunder.

XIX. Governing Law and Time. THIS UNDERWRITING AGREEMENT AND ANY APPLICABLE TERMS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. SPECIFIED TIMES OF DAY REFER TO NEW YORK CITY TIME.

XX. Counterparts. This Underwriting Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same Underwriting Agreement. Counterparts may be delivered via facsimile, electronic mail (including any electronic signature covered by the U.S. federal ESIGN Act of 2000, Uniform Electronic Transactions Act, the Electronic Signatures and Records Act or other applicable law, e.g., www.docusign.com) or other transmission method and any counterpart so delivered shall be deemed to have been duly and validly delivered and be valid and effective for all purposes.

XXI. Effect of Headings. The Article and Section headings herein and the Table of Contents are for convenience only and shall not affect the construction hereof.

[REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

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[Signature Page to Underwriting Agreement]

Exhibit A

TERMS AGREEMENT

[Intentionally omitted]

A-1

Exhibit B

FORM OF OPINION OF BÄR & KARRER AG, GUARANTOR’S

SWISS COUNSEL, TO BE DELIVERED

PURSUANT TO SECTION 5(b)

[Intentionally omitted]

B-1

Exhibit C

FORM OF OPINION OF THE

GENERAL COUNSEL OF THE GUARANTOR,

TO BE DELIVERED PURSUANT TO SECTION 5(b)

[Intentionally omitted]

C-1

Exhibit D

FORM OF OPINION OF MAYER BROWN LLP,

UNITED STATES COUNSEL FOR THE COMPANY AND THE

GUARANTOR, TO BE DELIVERED PURSUANT TO SECTION 5(b)

[Intentionally omitted]

D-1

Exhibit 1.2

Executed Version

CHUBB INA HOLDINGS LLC

(a Delaware limited liability company)

Debt Securities

Unconditionally Guaranteed as to Payment of

Principal, Premium, if any, and Interest by

CHUBB LIMITED

TERMS AGREEMENT

July 29, 2024

436 Walnut Street,

Philadelphia, PA 19106

CHUBB LIMITED

Bärengasse 32,

CH-8001 Zurich, Switzerland

Ladies and Gentlemen:

We understand that Chubb INA Holdings LLC, a Delaware limited liability company (the “Company”), proposes to issue and sell $700,000,000 aggregate principal amount of its senior debt securities due 2029 (the “Underwritten 2029 Securities”) and $600,000,000 aggregate principal amount of its senior debt securities due 2034 (the “Underwritten 2034 Securities” and, together with the Underwritten 2029 Securities, the “Underwritten Securities”), which will be unconditionally guaranteed as to payment of principal, premium, if any, and interest by Chubb Limited, a Swiss company. The Underwritten 2034 Securities will constitute a further issuance of, and will be consolidated and form a single series with, the 5.000% Senior Notes due 2034 of which $1,000,000,000 aggregate principal amount was issued by the Company on March 7, 2024 (the “Existing Underwritten 2034 Securities”). The terms of the Underwritten 2034 Securities, other than their issue date and issue price, will be identical to the terms of the Existing Underwritten 2034 Securities. Upon settlement, the Underwritten 2034 Securities will have the same CUSIP number as, and will trade interchangeably with, the Existing Underwritten 2034 Securities. Immediately after giving effect to the issuance of the Underwritten 2034 Notes, the Company will have $1,600,000,000 aggregate principal amount of 5.000% Senior Notes due 2034 outstanding. Subject to the terms and conditions set forth or incorporated by reference herein, the underwriters named below (the “Underwriters”) offer to purchase, severally and not jointly, the principal amount of Underwritten Securities opposite their names set forth below at the purchase price set forth below.

With Respect to the Underwritten 2029 Securities

The Underwritten 2029 Securities shall have the following terms:

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With Respect to the Underwritten 2034 Securities

3

The Underwritten 2034 Securities shall have the following terms:

4

5

Notices: Notice to the Underwriters shall be directed to the following, as Representatives, as follows:

Wells Fargo Securities, LLC

550 South Tryon Street, 5^th Floor

Charlotte, North Carolina 28202

Attention: Transaction Management

Email: tmgcapitalmarkets@wellsfargo.com

Barclays Capital Inc.

745 7th Avenue

New York, New York 10019

Attention: Syndicate Registration

Fax: (646) 834-8133

Citigroup Global Markets Inc.

388 Greenwich Street

New York, New York 10013

Attention: General Counsel

Email: TEG.NewYork@citi.com

All of the provisions contained in the document attached as Annex I hereto entitled “CHUBB INA HOLDINGS LLC (a Delaware limited liability company) – Senior and Subordinated Debt Securities – Unconditionally Guaranteed as to Payment of Principal, Premium, if any, and Interest by CHUBB LIMITED – UNDERWRITING AGREEMENT” (the “Underwriting Agreement”) are hereby incorporated by reference in their entirety herein and shall be deemed to be a part of this Terms Agreement to the same extent as if such provisions had been set forth in full herein. Terms defined in such document are used herein as therein defined.

Each of the parties hereto hereby expressly and irrevocably submits to the non-exclusive jurisdiction of any competent court in the place of its domicile and any United States Federal or New York State court sitting in the Borough of Manhattan in The City of New York in any action, suit or proceeding arising out of or relating to this Terms Agreement or the transactions contemplated hereby or thereby to the extent that such court has subject matter jurisdiction over the controversy, and expressly and irrevocably waives, to the extent permitted under applicable law, any immunity from the jurisdiction thereof and any claim or defense in such action, suit or proceeding based on a claim of improper venue, forum non conveniens or any similar basis to which it might otherwise be entitled in any such action, suit or proceeding. Each of the Company and the Guarantor irrevocably appoints Chubb Group Holdings Inc., 550 Madison Avenue, New York, New York 10022, as its authorized agent in the Borough of Manhattan in The City of New York upon which process may be served in any such action, suit or proceeding, and agrees that service of process upon such agent, and written notice of said service to the

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Company or the Guarantor by the person serving the same to the address provided in Section 11 of the Underwriting Agreement, shall be deemed in every respect effective service of process upon the Company or the Guarantor, as the case may be, in any such action, suit or proceeding. Each of the Company and the Guarantor further agrees to take any and all action as may be necessary to maintain such designation and appointment of such agent in full force and effect for a period of seven years from the date of this Terms Agreement.

This Terms Agreement shall be governed by and construed in accordance with the laws of the State of New York.

This Terms Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same Terms Agreement. Counterparts may be delivered via facsimile, electronic mail (including any electronic signature covered by the U.S. federal ESIGN Act of 2000, Uniform Electronic Transactions Act, the Electronic Signatures and Records Act or other applicable law, e.g., www.docusign.com) or other transmission method and any counterpart so delivered shall be deemed to have been duly and validly delivered and be valid and effective for all purposes.

Please accept this offer no later than 4:15 P.M. (New York City time) on July 29, 2024 by signing a copy of this Terms Agreement in the space set forth below and returning the signed copy to us.

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[Signature Page to Terms Agreement]

[Signature Page to Terms Agreement]

Schedule I

ISSUER FREE WRITING PROSPECTUS(ES)

Final Term Sheet dated July 29, 2024 (attached hereto as Schedule II)

Schedule II

Pricing Term Sheet

$1,300,000,000

Chubb INA Holdings LLC

$700,000,000 4.650% Senior Notes due 2029

$600,000,000 5.000% Senior Notes due 2034

Each Fully and Unconditionally Guaranteed by

Chubb Limited

Pricing Term Sheet

July 29, 2024

The issuer and the guarantor have filed a registration statement (including a prospectus) with the SEC for the offerings to which this communication relates. Before you invest, you should read the prospectus in that registration statement and other documents the issuer or the guarantor has filed with the SEC for more complete information about the issuer, the guarantor and these offerings. You may get these documents for free by visiting EDGAR on the SEC Web site at www.sec.gov. Alternatively, the issuer, any underwriter or any dealer participating in these offerings will arrange to send you the prospectus if you request it by calling Wells Fargo Securities, LLC at 1-800-645-3751, Barclays Capital Inc. at 1-888-603-5847 and Citigroup Global Markets Inc. at 1-800-831-9146.

This Pricing Term Sheet is not a prospectus for the purposes of Regulation (EU) 2017/1129, including as the same forms part of domestic law in the United Kingdom by virtue of the European Union (Withdrawal) Act 2018, as amended by the European Union (Withdrawal Agreement) Act 2020.

No PRIIPs or UK PRIIPs KID – No PRIIPs or UK PRIIPs key information document (KID) has been prepared as not available to retail in EEA or UK.

In the UK, this Pricing Term Sheet and any other document or materials relating to the issue of the Notes offered hereby is being distributed only to and is directed only at: (i) persons who are “investment professionals” falling within Article 19(5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005 (as amended, the “Order”), (ii) high net worth companies, unincorporated associations and other bodies within the categories described in Article 49(2)(a) to (d) of the Order and (iii) any other persons to whom an invitation or

inducement to engage in investment activity (within the meaning of Section 21 of the United Kingdom’s Financial Services and Markets Act 2000, as amended (the “FSMA”)) in connection with the issue or sale of the Notes may otherwise lawfully be communicated or caused to be communicated (all such persons together being referred to as “relevant persons”). Any person who is not a relevant person should not act or rely on this Pricing Term Sheet or any of its contents. Any investment or investment activity to which this Pricing Term Sheet relates is available only to relevant persons and will be engaged in only with relevant persons.

Any disclaimers or notices that may appear on this Pricing Term Sheet below the text of this legend are not applicable to this Pricing Term Sheet and should be disregarded. Such disclaimers may have been electronically generated as a result of this Pricing Term Sheet being sent via, or posted on, Bloomberg or another electronic mail system.

Annex I

UNDERWRITING AGREEMENT

[Intentionally omitted]

Exhibit 4.1

CHUBB INA HOLDINGS LLC

Officer’s Certificate

Pursuant to Sections 1.2, 3.1 and 3.3 of the Indenture, dated as of August 1, 1999 (the “Base Indenture”), among Chubb INA Holdings LLC (formerly known as ACE INA Holdings Inc.), as issuer (the “Company”), Chubb Limited (formerly known as ACE Limited), as guarantor (the “Guarantor”), and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust Company, N.A., as successor to J.P. Morgan Trust Company, National Association and The First National Bank of Chicago), as trustee (the “Trustee”), as supplemented by the First Supplemental Indenture, dated as of March 13, 2013 (the “First Supplemental Indenture” and, together with the Base Indenture, the “Indenture”), by and among the Company, the Guarantor and the Trustee, the undersigned, Peter C. Enns, Executive Vice President and Chief Financial Officer of the Company, hereby certifies as follows:

I. The issuance of the following Securities (as defined below) has been approved and authorized in accordance with the provisions of the Indenture pursuant to resolutions duly adopted by the Board of Directors of the Company on October 15, 2015, August 16, 2021 and February 22, 2024. The terms of the Securities shall be as follows:

(a) The title of the 2029 Notes is “4.650% Senior Notes due 2029” (the “2029 Notes”) and the title of the 2034 Notes is “5.000% Senior Notes due 2034” (the “2034 Notes” and, together with the 2029 Notes, the “Securities”).

(b) The 2034 Notes constitute a further issuance of, and will be consolidated and form a single series with, the $1,000,000,000 aggregate principal amount of 5.000% Senior Notes due 2034 issued on March 7, 2024 (the “Existing 2034 Notes”). The terms of the Existing 2034 Notes were previously established by an Officer’s Certificate dated March 7, 2024.

(c) The aggregate principal amount of the 2029 Notes which may be authenticated and delivered under the Indenture is initially limited to $700,000,000 and the aggregate principal amount of the 2034 Notes which may be authenticated and delivered under the Indenture is initially limited to $1,600,000,000, which includes the Existing 2034 Notes and $600,000,000 aggregate principal amount of the additional 2034 Notes, except, in each case, for the Securities of each series authenticated and delivered upon registration of transfer of, or in exchange for, or in lieu of, the other Securities of each series pursuant to Sections 3.4, 3.5, 3.6, 9.5 or 11.7 of the Indenture.

(d) The 2029 Notes shall be issued in book-entry form, in denominations of $2,000 or any amount in excess thereof which is an integral multiple of $1,000, and represented by two registered global securities substantially in the form attached hereto as Exhibit A delivered to The Depository Trust Company (the “Depositary”), or a custodian on the Depositary’s behalf, and recorded in the book-entry system maintained by the Depositary. The 2034 Notes shall be issued in book-entry form, in denominations of $2,000 or any amount in excess thereof which is an integral multiple of $1,000, and represented by two registered global securities substantially in the form attached hereto as Exhibit B delivered to the Depositary, or a custodian on the Depositary’s behalf, and recorded in the book-entry system maintained by the Depositary.

(e) The principal amount of the 2029 Notes shall be due and payable on August 15, 2029. The principal amount of the 2034 Notes shall be due and payable on March 15, 2034.

(f) The principal of the 2029 Notes shall bear interest from July 31, 2024 or from the most recent 2029 Note Interest Payment Date (as defined below) to which interest has been paid or duly provided for, payable semi-annually in arrears on February 15 and August 15 of each year (each, a “2029 Note Interest Payment Date”), commencing February 15, 2025, to the Persons in whose names the 2029 Notes (or one or more Predecessor Securities of the 2029 Notes, as defined in the Indenture) are registered at the close of business on the February 1 or August 1, as the case may be, preceding such 2029 Note Interest Payment Dates. The principal of the 2034 Notes shall bear interest from March 7, 2024 or from the most recent 2034 Note Interest Payment Date (as defined below) to which interest has been paid or duly provided for, payable semi-annually in arrears on March 15 and September 15 of each year (each, a “2034 Note Interest Payment Date” and, together with each 2029 Note Interest Payment Date, each an “Interest Payment Date”), commencing September 15, 2024, to the Persons in whose names the 2034 Notes (or one or more Predecessor Securities of the 2034 Notes, as defined in the Indenture) are registered at the close of business on the March 1 or September 1, as the case may be, preceding such 2034 Note Interest Payment Dates.

(g) Interest on the 2029 Notes will accrue at the rate of 4.650% per annum from July 31, 2024 until the principal thereof is paid or made available for payment. Interest on the 2034 Notes will accrue at the rate of 5.000% per annum from March 7, 2024 until the principal thereof is paid or made available for payment.

(h) The principal of, interest on and any Additional Amounts with respect to each series of the Securities shall be payable, and the Securities may be surrendered or presented for payment, the Securities may be surrendered for registration of transfer or exchange, and notices and demands to or upon the Company or the Guarantor in respect of the Securities and the Indenture may be served, at the office or agency of the Company and the Guarantor maintained for such purposes in The City of New York, State of New York from time to time, and the Company hereby appoints the Trustee, acting through its office or agency in The City of New York designated from time to time for such purpose, as its agent for the foregoing purposes; provided, however, that, at the option of the Company or the Guarantor, interest may be paid by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register; and provided, further, that (subject to Section 10.2 of the Indenture) the Company may at any time remove the Trustee as its office or agency in The City of New York designated for the foregoing purposes and may from time to time designate one or more other offices or agencies for the foregoing purposes and may from time to time rescind such designations.

(i) The Securities of each series shall be redeemable at the option of the Company prior to Stated Maturity as described in Exhibit A with respect to the 2029 Notes and Exhibit B with respect to the 2034 Notes, and are not subject to a sinking fund or analogous provision.

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(j) Payments of principal, interest on and any Additional Amounts with respect to the Securities of each series shall be made in such coin or currency of the United States of America as at the time of payment shall be legal tender for the payment of public and private debts.

(k) The Trustee shall be Security Registrar and the initial Paying Agent and initial transfer agent for the Securities of each series (subject to the Company’s right (subject to Section 10.2 of the Indenture) to remove the Trustee as such Paying Agent and/or transfer agent and, from time to time, to designate one or more co-registrars and one or more other Paying Agents and transfer agents and to rescind from time to time any such designations), and The City of New York is designated as a Place of Payment for the Securities of each series.

(l) Additional Amounts shall be payable in respect of the Securities of each series on the terms and subject to the conditions set forth in Section 10.4 of the Indenture and in the Securities of each series. Whenever in this Officer’s Certificate or in the certificate evidencing the Securities of either series there is mentioned, in any context, the payment of principal, interest or any other amount payable under or with respect to such Security, such mention shall be deemed to include mention of the payment of Additional Amounts to the extent that, in such context, Additional Amounts are, were or would be payable in respect thereof.

(m) The Securities of each series shall have such additional terms and provisions as are set forth in Exhibit A hereto with respect to the 2029 Notes and Exhibit B hereto with respect to the 2034 Notes, all of which terms and provisions are incorporated by reference in and made a part of this Officer’s Certificate as if set forth in full herein.

II. To the best knowledge of the undersigned, all conditions precedent to the execution, authentication and delivery of the Securities of each series described herein have been complied with, and no event which is, or after notice or lapse of time would become, an Event of Default with respect to the Securities has occurred and is continuing.

The undersigned states that he has read and is familiar with the provisions of Article III of the Indenture relating to the issuance of Securities of each series thereunder; that he is generally familiar with the other provisions of the Indenture and with the affairs of the Company, the Guarantor and their corporate acts and proceedings; and that, in his opinion, he has made such examination or investigation as is necessary to enable him to express an informed opinion as to whether or not the conditions precedent referred to above have been complied with.

Insofar as this certificate relates to legal matters, it is based, as provided for in Section 3.3 of the Indenture, upon the Opinion of Counsel delivered to the Trustee contemporaneously herewith pursuant to Section 3.3 of the Indenture and relating to the Securities of each series described herein.

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Capitalized terms used herein and not otherwise defined herein have the meanings specified in the Indenture.

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IN WITNESS WHEREOF, I, as Executive Vice President and Chief Financial Officer of the Company, have hereunto signed my name.

Dated: July 31, 2024

[Signature Page to Officer’s Certificate (Indenture) of Chubb INA Holdings LLC]

EXHIBIT A

[Form of Note]

[Intentionally omitted]

EXHIBIT B

[Form of Note]

[Intentionally omitted]

Exhibit 4.2

[Form of Note]

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY (AS DEFINED IN THE INDENTURE) OR A NOMINEE THEREOF. THIS GLOBAL SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM, THIS GLOBAL SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY, OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY, OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITORY.

UNLESS THIS SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY (AS DEFINED BELOW) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SECURITY ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC) ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

Chubb INA Holdings LLC

4.650% Senior Note due 2029

Chubb INA Holdings LLC, a Delaware limited liability company (hereinafter called the “Company”, which term includes any successor corporation under the Indenture referred to below), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of [     ] HUNDRED MILLION ($[     ],000,000) on August 15, 2029 and to pay interest thereon from July 31, 2024 or from the most recent interest payment date to which interest has been paid or duly provided for, payable semi-annually on February 15 and August 15 in each year (each, an “Interest Payment Date”), commencing February 15, 2025, at the rate of 4.650% per annum, until the principal hereof (and any Additional Amounts (as defined below)) is paid or duly made available for payment. Interest on this Note shall be computed on the basis of a 360-day year consisting of twelve 30-day months. If any Interest Payment Date or

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maturity or redemption date falls on a day that is not a Business Day, the required payment shall be made on the next Business Day as if it were made on the date such payment was due and no interest shall accrue on the amount so payable for the period from and after such Interest Payment Date or maturity or redemption date, as the case may be, to such next Business Day. The interest so payable and punctually paid or duly provided for on any Interest Payment Date will, as provided in the Indenture referred to herein, be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on the regular record date for such interest, which shall be February 1 or August 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Any such interest which is payable, but is not punctually paid or duly provided for, on any Interest Payment Date shall forthwith cease to be payable to the registered Holder hereof on the relevant regular record date by virtue of having been such Holder, and may be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a subsequent Special Record Date (which shall be at least 10 days before the payment date) for the payment of such defaulted interest to be fixed by the Company, notice whereof shall be given to the Holders of Notes of this series not less than 10 days prior to such Special Record Date, or may be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture referred to herein. Any interest paid on this Note shall be increased to the extent necessary to pay Additional Amounts as set forth in this Note.

Payment of the principal of, interest on or any Redemption Price or Additional Amounts in respect of this Note shall be made at the office or agency of the Company and the Guarantor (as defined below) maintained for that purpose in The Borough of Manhattan, The City of New York, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that, at the option of the Company or the Guarantor, interest may be paid by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register; provided, further, that payment to DTC or any successor Depository may be made by wire transfer to the account designated by DTC or such successor depository in writing.

This Note is one of a duly authorized issuance of securities of the Company (herein called the “Notes”), fully and unconditionally guaranteed as to payment of principal premium, if any, and interest by Chubb Limited, a company limited by shares (Aktiengesellschaft) under the laws of Switzerland (the “Guarantor”), issued and to be issued in one or more series under an Indenture, dated as of August 1, 1999, as supplemented by the First Supplemental Indenture, dated as of March 13, 2013 (such Indenture and First Supplemental Indenture together herein called, together with all indentures supplemental thereto, the “Indenture”), among the Company (formerly known as ACE INA Holdings Inc.), the Guarantor (formerly known as ACE Limited) and The Bank of New York Mellon Trust Company, N.A. (as successor to J.P. Morgan Trust Company, National Association and The First National Bank of Chicago), as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), to which the Indenture and all indentures supplemental thereto referenced is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Guarantor, the Trustee and the Holders of the Notes, and of the terms upon which the Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof, initially limited (subject to exceptions related to further Notes provided in the Indenture) to the aggregate principal amount specified in the Officer’s Certificate, dated as of July 31, 2024, establishing the terms of the Notes pursuant to the Indenture.

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The Notes are senior unsecured obligations of the Company and will rank equally in right of payment with all of the Company’s other unsecured and unsubordinated indebtedness from time to time outstanding. The Company’s obligation to pay the principal of, interest on or any Additional Amounts in respect of the Notes is unconditionally guaranteed on a senior unsecured basis by the Guarantor pursuant to Article 16 of the Indenture.

If an Event of Default with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

The Indenture contains provisions permitting, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company or the Guarantor and the rights of the Holders of the Securities of each series issued under the Indenture at any time by the Company, the Guarantor and the Trustee with the written consent of the Holders of not less than a majority in aggregate principal amount of the Securities at the time Outstanding of each series affected thereby. The Indenture also contains provisions permitting the Holders of specified percentages in aggregate principal amount of the Securities of any series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company or the Guarantor with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Notes issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

This Note is not subject to any sinking fund.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of, interest on or any Redemption Price or any Additional Amounts in respect of this Note, at the times, place and rate, and in the coin or currency, herein and in the Indenture prescribed.

As provided in the Indenture and subject to certain limitations set forth therein and in this Note, the transfer of this Note may be registered on the Security Register upon surrender of this Note for registration of transfer at the office or agency of the Company and the Guarantor maintained for that purpose in any place where the principal of, interest on or any Additional Amounts in respect of this Note are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or by his attorney duly authorized in writing, and thereupon one or more new Notes of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, shall be issued to the designated transferee or transferees.

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The Notes are issuable only in registered form without coupons in the denominations specified in the Officer’s Certificate, dated as of July 31, 2024, establishing the terms of the Notes, all as more fully provided in the Indenture and such Officer’s Certificate. As provided in the Indenture and in such Officer’s Certificate, and subject to certain limitations set forth in the Indenture, such Officer’s Certificate and in this Note, the Notes are exchangeable for a like aggregate principal amount of Notes of this series in different authorized denominations, as requested by the Holders surrendering the same.

No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith, other than in certain cases provided in the Indenture.

Prior to due presentment of this Note for registration of transfer, the Company, the Guarantor, the Trustee and any agent of the Company, the Guarantor or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and neither the Company, the Guarantor, the Trustee nor any such agent shall be affected by notice to the contrary.

The Notes are redeemable in whole at any time or in part from time to time prior to July 15, 2029 (the “Par Call Date”), at the Company’s option, at a Redemption Price equal to the greater of (i) (a) the sum of the present values of the remaining scheduled payments of principal and interest on the Notes being redeemed discounted to the redemption date (assuming the Notes to be redeemed matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points less (b) interest accrued to the redemption date; and (ii) 100 percent of the principal amount of the Notes being redeemed; plus, in either case, accrued and unpaid interest on the Notes to be redeemed to, but excluding, the redemption date.

In addition, at any time on or after the Par Call Date, the Notes are redeemable in whole or in part, at the Company’s option, at a Redemption Price equal to 100 percent of the principal amount of the Notes being redeemed plus accrued and unpaid interest on the Notes being redeemed to, but excluding, the Redemption Date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily) - H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on

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H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date

If on the third business day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of Notes to be redeemed.

Any redemption made at the option of the Company shall be conducted in accordance with Article 11 of the Indenture, provided that any reference in Section 11.4 of the Indenture to 30 days shall be deemed to be 10 days for the purposes of this Note. Notwithstanding anything to the contrary in the Indenture, in the case of a partial redemption, selection of the Notes for redemption will be made by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by DTC (or another depositary), the redemption of the Notes shall be done in accordance with the policies and procedures of the depositary.

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Unless the Company defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

In addition, the Company may at any time purchase any of the Notes by tender, in the open market or by private agreement, subject to applicable law.

“Business Day” means any day other than a Saturday, Sunday or other day on which banking institutions in the City of New York are authorized or obligated by law, regulation or executive order to close.

The Company or, in the event that payments are required to be made by the Guarantor pursuant to its obligations under the Guarantee, the Guarantor will, subject to the exceptions and limitations set forth below, pay such additional amounts as are necessary in order that the net payment by the Company, the Guarantor or a Paying Agent of the principal of, and premium, if any, and interest on this Note to a Holder, after withholding or deduction for any future tax, assessment or other governmental charge imposed by the United States, Switzerland or any other jurisdiction in which the Company or the Guarantor or, in each case, any successor Person substituted in accordance with the Indenture may be organized or resident for tax purposes, as applicable, or any political subdivision thereof or therein having the power to tax (a “Taxing Jurisdiction”), will not be less than the amount provided in this Note to be then due and payable (“Additional Amounts”); provided, however, that the foregoing obligation to pay Additional Amounts shall not apply: (1) to any tax, assessment or other governmental charge that would not have been imposed but for the Holder (or the beneficial owner for whose benefit such Holder holds this Note), or a fiduciary, settlor, beneficiary, member or shareholder of the Holder if the Holder is an estate, trust, partnership or corporation, or a person holding a power over an estate or trust administered by a fiduciary Holder, being considered as: (a) being or having been engaged in a trade or business in the Taxing Jurisdiction or having or having had a permanent establishment in the Taxing Jurisdiction; (b) having a current or former connection with the Taxing Jurisdiction (other than a connection arising solely as a result of the ownership of the Notes or the receipt of any payment or the enforcement of any rights thereunder), including being or having been a citizen or resident of the Taxing Jurisdiction; (c) being or having been a personal holding company, a passive foreign investment company or a controlled foreign corporation for United States income tax purposes or a corporation that has accumulated earnings to avoid United States federal income tax; (d) being or having been a “10-percent shareholder” of the Company or the Guarantor as defined in section 871(h)(3) of the United States Internal Revenue Code of 1986, as amended (the “Code”), or any successor provision; or (e) being a bank receiving payments on an extension of credit made pursuant to a loan agreement entered into in the ordinary course of its trade or business; (2) to any Holder that is not the sole beneficial owner of the Notes, or a portion of the Notes, or that is a fiduciary, partnership or limited liability company, but only to the extent that a beneficial owner with respect to the Holder, a beneficiary or settlor with respect to the fiduciary, or a beneficial owner or member of the partnership or limited liability company would not have been entitled to the payment of an Additional Amount had the beneficiary, settlor, beneficial owner or member received directly its beneficial or distributive share of the payment; (3) to any tax, assessment or other governmental charge that would not have been imposed but for the failure of the Holder or any other person to comply with certification, identification or information reporting

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requirements concerning the nationality, residence, identity or connection with the Taxing Jurisdiction of the Holder or beneficial owner of the Notes, if compliance is required by statute, by regulation of the Taxing Jurisdiction or any taxing authority therein or by an applicable income tax treaty to which the Taxing Jurisdiction is a party as a precondition to exemption from such tax, assessment or other governmental charge; (4) to any U.S. federal backup withholding tax (5) to any tax, assessment or other governmental charge that is payable otherwise than by withholding by the Company, the Guarantor or a Paying Agent from the payment; (6) to any tax, assessment or other governmental charge that would not have been imposed but for a change in law, regulation, or administrative or judicial interpretation that becomes effective more than 15 days after the payment becomes due or is duly provided for, whichever occurs later; (7) to any estate, inheritance, gift, sales, excise, transfer, wealth, capital gains or personal property tax or similar tax, assessment or other governmental charge; (8) to any tax, assessment or other governmental charge required to be withheld by any paying agent from any payment of principal of or interest on any Note, if such payment can be made without such withholding by at least one other paying agent; (9) to any tax, assessment or other governmental charge that would not have been imposed but for the presentation by the Holder of any Note, where presentation is required, for payment on a date more than 30 days after the date on which payment became due and payable or the date on which payment thereof is duly provided for, whichever occurs later; (10) to any tax, assessment or other governmental charge imposed under Sections 1471 through 1474 of the Code (or any amended or successor provisions), any current or future regulations or official interpretations thereof, any agreement entered into pursuant to Section 1471(b) of the Code, any intergovernmental agreement entered into in connection with the implementation of the foregoing and any fiscal or regulatory legislation, rules or practices adopted pursuant to any such intergovernmental agreement; or (10) in the case of any combination of items (1), (2), (3), (4), (5), (6), (7), (8), (9) and (10).

The Company shall be entitled to redeem this Note, at its option, at any time as a whole but not in part, upon not less than 10 nor more than 60 days’ notice, at 100 percent of the principal amount thereof, plus accrued and unpaid interest (if any) to, but excluding, the Redemption Date (subject to the right of Holders of record on the relevant record date to receive interest due on the relevant Interest Payment Date), in the event that the Company or the Guarantor has become or would become obligated to pay, on the next date on which any amount would be payable with respect to this Note, any Additional Amounts as a result of: (1) a change in or an amendment to the laws (including any regulations promulgated thereunder) of a Taxing Jurisdiction, which change or amendment is announced after July 29, 2024; or (2) any change in or amendment to any official position regarding the application or interpretation of such laws or regulations, which change or amendment is announced after July 29, 2024, and, in each case, the Company or the Guarantor, as applicable, cannot avoid such obligation by taking reasonable measures available to it.

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The Indenture contains provisions whereby (i) the Company and the Guarantor may be discharged from their obligations with respect to the Notes (subject to certain exceptions) or (ii) the Company and the Guarantor may be released from their obligations under specified covenants and agreements in the Indenture, in each case if the Company or the Guarantor irrevocably deposits with the Trustee money or Government Obligations, or a combination thereof, in an amount sufficient, without consideration of any reinvestment, to pay and discharge the entire indebtedness on all Notes of this series, and satisfies certain other conditions, all as more fully provided in the Indenture.

This Note shall be governed by and construed in accordance with the laws of the State of New York applicable to agreements and instruments made and to be performed wholly within such State.

All terms used in this Note without definition that are defined in the Indenture shall have the meanings assigned to them in the Indenture.

[Remainder of Page Intentionally Left Blank]

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Unless the Certificate of Authentication hereon has been executed by or on behalf of the Trustee under the Indenture by the manual signature of one of its authorized officers, this Note shall not be entitled to any benefits under the Indenture or be valid or obligatory for any purpose.

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

Dated: July 31, 2024

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CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated: July 31, 2024

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ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

Additional abbreviations may also be used though not in the above list.

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FOR VALUE RECEIVED, the undersigned registered Holder hereby sell(s), assign(s) and transfer(s) unto

[PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE]

[PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE]

the within Note and all rights thereunder, hereby irrevocably constituting and appointing                                to transfer said Note on the books of the Company with full power of substitution in the premises.

Dated:      

Signature:                

Signature Guaranty:                            

Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Trustee, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Trustee in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

Exhibit 4.3

[Form of Note]

THIS SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE INDENTURE HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF A DEPOSITORY (AS DEFINED IN THE INDENTURE) OR A NOMINEE THEREOF. THIS GLOBAL SECURITY IS EXCHANGEABLE FOR SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN THE DEPOSITORY OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE INDENTURE AND, UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR SECURITIES IN DEFINITIVE FORM, THIS GLOBAL SECURITY MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITORY TO A NOMINEE OF THE DEPOSITORY, OR BY A NOMINEE OF THE DEPOSITORY TO THE DEPOSITORY OR ANOTHER NOMINEE OF THE DEPOSITORY, OR BY THE DEPOSITORY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITORY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITORY.

UNLESS THIS SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY (AS DEFINED BELOW) OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SECURITY ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC) ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

Chubb INA Holdings LLC

5.000% Senior Note due 2034

Chubb INA Holdings LLC, a Delaware limited liability company (hereinafter called the “Company”, which term includes any successor corporation under the Indenture referred to below), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal sum of [    ] HUNDRED MILLION ($[    ],000,000) on March 15, 2034 and to pay interest thereon from March 7, 2024 or from the most recent interest payment date to which interest has been paid or duly provided for, payable semi-annually on March 15 and September 15 in each year (each, an “Interest Payment Date”), commencing September 15, 2024, at the rate of 5.000% per annum, until the principal hereof (and any Additional Amounts (as defined below)) is paid or duly made available for payment. Interest on this Note shall be computed on the basis of a 360-day year consisting of twelve 30-day months. If any Interest Payment Date or maturity or redemption date falls on a day that is not a Business Day, the required payment shall

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be made on the next Business Day as if it were made on the date such payment was due and no interest shall accrue on the amount so payable for the period from and after such Interest Payment Date or maturity or redemption date, as the case may be, to such next Business Day. The interest so payable and punctually paid or duly provided for on any Interest Payment Date will, as provided in the Indenture referred to herein, be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on the regular record date for such interest, which shall be March 1 or September 1 (whether or not a Business Day), as the case may be, next preceding such Interest Payment Date. Any such interest which is payable, but is not punctually paid or duly provided for, on any Interest Payment Date shall forthwith cease to be payable to the registered Holder hereof on the relevant regular record date by virtue of having been such Holder, and may be paid to the Person in whose name this Note (or one or more Predecessor Securities) is registered at the close of business on a subsequent Special Record Date (which shall be at least 10 days before the payment date) for the payment of such defaulted interest to be fixed by the Company, notice whereof shall be given to the Holders of Notes of this series not less than 10 days prior to such Special Record Date, or may be paid at any time in any other lawful manner not inconsistent with the requirements of any securities exchange on which the Notes may be listed, and upon such notice as may be required by such exchange, all as more fully provided in the Indenture referred to herein. Any interest paid on this Note shall be increased to the extent necessary to pay Additional Amounts as set forth in this Note.

Payment of the principal of, interest on or any Redemption Price or Additional Amounts in respect of this Note shall be made at the office or agency of the Company and the Guarantor (as defined below) maintained for that purpose in The Borough of Manhattan, The City of New York, in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts; provided, however, that, at the option of the Company or the Guarantor, interest may be paid by check mailed to the address of the Person entitled thereto as such address shall appear in the Security Register; provided, further, that payment to DTC or any successor Depository may be made by wire transfer to the account designated by DTC or such successor depository in writing.

This Note is one of a duly authorized issuance of securities of the Company (herein called the “Notes”), fully and unconditionally guaranteed as to payment of principal premium, if any, and interest by Chubb Limited, a company limited by shares (Aktiengesellschaft) under the laws of Switzerland (the “Guarantor”), issued and to be issued in one or more series under an Indenture, dated as of August 1, 1999, as supplemented by the First Supplemental Indenture, dated as of March 13, 2013 (such Indenture and First Supplemental Indenture together herein called, together with all indentures supplemental thereto, the “Indenture”), among the Company (formerly known as ACE INA Holdings Inc.), the Guarantor (formerly known as ACE Limited) and The Bank of New York Mellon Trust Company, N.A. (as successor to J.P. Morgan Trust Company, National Association and The First National Bank of Chicago), as Trustee (herein called the “Trustee,” which term includes any successor trustee under the Indenture), to which the Indenture and all indentures supplemental thereto referenced is hereby made for a statement of the respective rights, limitations of rights, duties and immunities thereunder of the Company, the Guarantor, the Trustee and the Holders of the Notes, and of the terms upon which the Notes are, and are to be, authenticated and delivered. This Note is one of the series designated on the face hereof, initially limited (subject to exceptions related to further Notes provided in the Indenture) to the aggregate principal amount specified in the Officer’s Certificate, dated as of March 7, 2024, establishing the

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terms of the Notes pursuant to the Indenture and the issuance of the Notes increases the limit of the aggregate principal amount of Notes of this series (subject to exceptions related to further Notes provided in the Indenture) to the aggregate principal amount specified in the Officer’s Certificate, dated as of July 31, 2024. The Notes constitute a further issuance of, and will be consolidated and form a single series with, the aggregate principal amount of 5.000% Senior Notes due 2034 issued on March 7, 2024.

The Notes are senior unsecured obligations of the Company and will rank equally in right of payment with all of the Company’s other unsecured and unsubordinated indebtedness from time to time outstanding. The Company’s obligation to pay the principal of, interest on or any Additional Amounts in respect of the Notes is unconditionally guaranteed on a senior unsecured basis by the Guarantor pursuant to Article 16 of the Indenture.

If an Event of Default with respect to the Notes shall occur and be continuing, the principal of the Notes may be declared due and payable in the manner and with the effect provided in the Indenture.

The Indenture contains provisions permitting, with certain exceptions as therein provided, the amendment thereof and the modification of the rights and obligations of the Company or the Guarantor and the rights of the Holders of the Securities of each series issued under the Indenture at any time by the Company, the Guarantor and the Trustee with the written consent of the Holders of not less than a majority in aggregate principal amount of the Securities at the time Outstanding of each series affected thereby. The Indenture also contains provisions permitting the Holders of specified percentages in aggregate principal amount of the Securities of any series at the time Outstanding, on behalf of the Holders of all Securities of such series, to waive compliance by the Company or the Guarantor with certain provisions of the Indenture and certain past defaults under the Indenture and their consequences. Any such consent or waiver by the Holder of this Note shall be conclusive and binding upon such Holder and upon all future Holders of this Note and of any Notes issued upon the registration of transfer hereof or in exchange herefor or in lieu hereof, whether or not notation of such consent or waiver is made upon this Note.

This Note is not subject to any sinking fund.

No reference herein to the Indenture and no provision of this Note or of the Indenture shall alter or impair the obligation of the Company, which is absolute and unconditional, to pay the principal of, interest on or any Redemption Price or any Additional Amounts in respect of this Note, at the times, place and rate, and in the coin or currency, herein and in the Indenture prescribed.

As provided in the Indenture and subject to certain limitations set forth therein and in this Note, the transfer of this Note may be registered on the Security Register upon surrender of this Note for registration of transfer at the office or agency of the Company and the Guarantor maintained for that purpose in any place where the principal of, interest on or any Additional Amounts in respect of this Note are payable, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Company and the Security Registrar duly executed by, the Holder hereof or by his attorney duly authorized in writing, and thereupon one or more new Notes of this series and of like tenor, of authorized denominations and for the same aggregate principal amount, shall be issued to the designated transferee or transferees.

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The Notes are issuable only in registered form without coupons in the denominations specified in the Officer’s Certificate, dated as of March 7, 2024, establishing the terms of the Notes, all as more fully provided in the Indenture and such Officer’s Certificate. As provided in the Indenture and in such Officer’s Certificate, and subject to certain limitations set forth in the Indenture, such Officer’s Certificate and in this Note, the Notes are exchangeable for a like aggregate principal amount of Notes of this series in different authorized denominations, as requested by the Holders surrendering the same.

No service charge shall be made for any such registration of transfer or exchange, but the Company may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith, other than in certain cases provided in the Indenture.

Prior to due presentment of this Note for registration of transfer, the Company, the Guarantor, the Trustee and any agent of the Company, the Guarantor or the Trustee may treat the Person in whose name this Note is registered as the owner hereof for all purposes, whether or not this Note be overdue, and neither the Company, the Guarantor, the Trustee nor any such agent shall be affected by notice to the contrary.

The Notes are redeemable in whole at any time or in part from time to time prior to December 15, 2033 (the “Par Call Date”), at the Company’s option, at a Redemption Price equal to the greater of (i) (a) the sum of the present values of the remaining scheduled payments of principal and interest on the Notes being redeemed discounted to the redemption date (assuming the Notes to be redeemed matured on the Par Call Date) on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) at the Treasury Rate plus 15 basis points less (b) interest accrued to the redemption date; and (ii) 100 percent of the principal amount of the Notes being redeemed; plus, in either case, accrued and unpaid interest on the Notes to be redeemed to, but excluding, the redemption date.

In addition, at any time on or after the Par Call Date, the Notes are redeemable in whole or in part, at the Company’s option, at a Redemption Price equal to 100 percent of the principal amount of the Notes being redeemed plus accrued and unpaid interest on the Notes being redeemed to, but excluding, the Redemption Date.

“Treasury Rate” means, with respect to any redemption date, the yield determined by the Company in accordance with the following two paragraphs.

The Treasury Rate shall be determined by the Company after 4:15 p.m., New York City time (or after such time as yields on U.S. government securities are posted daily by the Board of Governors of the Federal Reserve System), on the third business day preceding the redemption date based upon the yield or yields for the most recent day that appear after such time on such day in the most recent statistical release published by the Board of Governors of the Federal Reserve System designated as “Selected Interest Rates (Daily) - H.15” (or any successor designation or publication) (“H.15”) under the caption “U.S. government securities–Treasury constant maturities–Nominal” (or any successor caption or heading) (“H.15 TCM”). In determining the

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Treasury Rate, the Company shall select, as applicable: (1) the yield for the Treasury constant maturity on H.15 exactly equal to the period from the redemption date to the Par Call Date (the “Remaining Life”); or (2) if there is no such Treasury constant maturity on H.15 exactly equal to the Remaining Life, the two yields – one yield corresponding to the Treasury constant maturity on H.15 immediately shorter than and one yield corresponding to the Treasury constant maturity on H.15 immediately longer than the Remaining Life – and shall interpolate to the Par Call Date on a straight-line basis (using the actual number of days) using such yields and rounding the result to three decimal places; or (3) if there is no such Treasury constant maturity on H.15 shorter than or longer than the Remaining Life, the yield for the single Treasury constant maturity on H.15 closest to the Remaining Life. For purposes of this paragraph, the applicable Treasury constant maturity or maturities on H.15 shall be deemed to have a maturity date equal to the relevant number of months or years, as applicable, of such Treasury constant maturity from the redemption date

If on the third business day preceding the redemption date H.15 TCM or any successor designation or publication is no longer published, the Company shall calculate the Treasury Rate based on the rate per annum equal to the semi-annual equivalent yield to maturity at 11:00 a.m., New York City time, on the second business day preceding such redemption date of the United States Treasury security maturing on, or with a maturity that is closest to, the Par Call Date, as applicable. If there is no United States Treasury security maturing on the Par Call Date but there are two or more United States Treasury securities with a maturity date equally distant from the Par Call Date, one with a maturity date preceding the Par Call Date and one with a maturity date following the Par Call Date, the Company shall select the United States Treasury security with a maturity date preceding the Par Call Date. If there are two or more United States Treasury securities maturing on the Par Call Date or two or more United States Treasury securities meeting the criteria of the preceding sentence, the Company shall select from among these two or more United States Treasury securities the United States Treasury security that is trading closest to par based upon the average of the bid and asked prices for such United States Treasury securities at 11:00 a.m., New York City time. In determining the Treasury Rate in accordance with the terms of this paragraph, the semi-annual yield to maturity of the applicable United States Treasury security shall be based upon the average of the bid and asked prices (expressed as a percentage of principal amount) at 11:00 a.m., New York City time, of such United States Treasury security, and rounded to three decimal places.

The Company’s actions and determinations in determining the redemption price shall be conclusive and binding for all purposes, absent manifest error.

Notice of any redemption will be mailed or electronically delivered (or otherwise transmitted in accordance with the depositary’s procedures) at least 10 days but not more than 60 days before the redemption date to each holder of Notes to be redeemed.

Any redemption made at the option of the Company shall be conducted in accordance with Article 11 of the Indenture, provided that any reference in Section 11.4 of the Indenture to 30 days shall be deemed to be 10 days for the purposes of this Note. Notwithstanding anything to the contrary in the Indenture, in the case of a partial redemption, selection of the Notes for redemption will be made by lot. No Notes of a principal amount of $2,000 or less will be redeemed in part. If any Note is to be redeemed in part only, the notice of redemption that relates to the Note will state the portion of the principal amount of the Note to be redeemed. A new Note in a principal amount

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equal to the unredeemed portion of the Note will be issued in the name of the holder of the Note upon surrender for cancellation of the original Note. For so long as the Notes are held by DTC (or another depositary), the redemption of the Notes shall be done in accordance with the policies and procedures of the depositary.

Unless the Company defaults in payment of the redemption price, on and after the redemption date interest will cease to accrue on the Notes or portions thereof called for redemption.

In addition, the Company may at any time purchase any of the Notes by tender, in the open market or by private agreement, subject to applicable law.

“Business Day” means any day other than a Saturday, Sunday or other day on which banking institutions in the City of New York are authorized or obligated by law, regulation or executive order to close.

The Company or, in the event that payments are required to be made by the Guarantor pursuant to its obligations under the Guarantee, the Guarantor will, subject to the exceptions and limitations set forth below, pay such additional amounts as are necessary in order that the net payment by the Company, the Guarantor or a Paying Agent of the principal of, and premium, if any, and interest on this Note to a Holder, after withholding or deduction for any future tax, assessment or other governmental charge imposed by the United States, Switzerland or any other jurisdiction in which the Company or the Guarantor or, in each case, any successor Person substituted in accordance with the Indenture may be organized or resident for tax purposes, as applicable, or any political subdivision thereof or therein having the power to tax (a “Taxing Jurisdiction”), will not be less than the amount provided in this Note to be then due and payable (“Additional Amounts”); provided, however, that the foregoing obligation to pay Additional Amounts shall not apply: (1) to any tax, assessment or other governmental charge that would not have been imposed but for the Holder (or the beneficial owner for whose benefit such Holder holds this Note), or a fiduciary, settlor, beneficiary, member or shareholder of the Holder if the Holder is an estate, trust, partnership or corporation, or a person holding a power over an estate or trust administered by a fiduciary Holder, being considered as: (a) being or having been engaged in a trade or business in the Taxing Jurisdiction or having or having had a permanent establishment in the Taxing Jurisdiction; (b) having a current or former connection with the Taxing Jurisdiction (other than a connection arising solely as a result of the ownership of the Notes or the receipt of any payment or the enforcement of any rights thereunder), including being or having been a citizen or resident of the Taxing Jurisdiction; (c) being or having been a personal holding company, a passive foreign investment company or a controlled foreign corporation for United States income tax purposes or a corporation that has accumulated earnings to avoid United States federal income tax; (d) being or having been a “10-percent shareholder” of the Company or the Guarantor as defined in section 871(h)(3) of the United States Internal Revenue Code of 1986, as amended (the “Code”), or any successor provision; or (e) being a bank receiving payments on an extension of credit made pursuant to a loan agreement entered into in the ordinary course of its trade or business; (2) to any Holder that is not the sole beneficial owner of the Notes, or a portion of the Notes, or that is a fiduciary, partnership or limited liability company, but only to the extent that a beneficial owner with respect to the Holder, a beneficiary or settlor with respect to the fiduciary, or a beneficial owner or member of the partnership or limited liability company would not have been entitled to the payment of an Additional Amount had the beneficiary, settlor, beneficial owner or member

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received directly its beneficial or distributive share of the payment; (3) to any tax, assessment or other governmental charge that would not have been imposed but for the failure of the Holder or any other person to comply with certification, identification or information reporting requirements concerning the nationality, residence, identity or connection with the Taxing Jurisdiction of the Holder or beneficial owner of the Notes, if compliance is required by statute, by regulation of the Taxing Jurisdiction or any taxing authority therein or by an applicable income tax treaty to which the Taxing Jurisdiction is a party as a precondition to exemption from such tax, assessment or other governmental charge; (4) to any U.S. federal backup withholding tax (5) to any tax, assessment or other governmental charge that is payable otherwise than by withholding by the Company, the Guarantor or a Paying Agent from the payment; (6) to any tax, assessment or other governmental charge that would not have been imposed but for a change in law, regulation, or administrative or judicial interpretation that becomes effective more than 15 days after the payment becomes due or is duly provided for, whichever occurs later; (7) to any estate, inheritance, gift, sales, excise, transfer, wealth, capital gains or personal property tax or similar tax, assessment or other governmental charge; (8) to any tax, assessment or other governmental charge required to be withheld by any paying agent from any payment of principal of or interest on any Note, if such payment can be made without such withholding by at least one other paying agent; (9) to any tax, assessment or other governmental charge that would not have been imposed but for the presentation by the Holder of any Note, where presentation is required, for payment on a date more than 30 days after the date on which payment became due and payable or the date on which payment thereof is duly provided for, whichever occurs later; (10) to any tax, assessment or other governmental charge imposed under Sections 1471 through 1474 of the Code (or any amended or successor provisions), any current or future regulations or official interpretations thereof, any agreement entered into pursuant to Section 1471(b) of the Code, any intergovernmental agreement entered into in connection with the implementation of the foregoing and any fiscal or regulatory legislation, rules or practices adopted pursuant to any such intergovernmental agreement; or (10) in the case of any combination of items (1), (2), (3), (4), (5), (6), (7), (8), (9) and (10).

The Company shall be entitled to redeem this Note, at its option, at any time as a whole but not in part, upon not less than 10 nor more than 60 days’ notice, at 100 percent of the principal amount thereof, plus accrued and unpaid interest (if any) to, but excluding, the Redemption Date (subject to the right of Holders of record on the relevant record date to receive interest due on the relevant Interest Payment Date), in the event that the Company or the Guarantor has become or would become obligated to pay, on the next date on which any amount would be payable with respect to this Note, any Additional Amounts as a result of: (1) a change in or an amendment to the laws (including any regulations promulgated thereunder) of a Taxing Jurisdiction, which change or amendment is announced after March 4, 2024; or (2) any change in or amendment to any official position regarding the application or interpretation of such laws or regulations, which change or amendment is announced after March 4, 2024, and, in each case, the Company or the Guarantor, as applicable, cannot avoid such obligation by taking reasonable measures available to it.

The Indenture contains provisions whereby (i) the Company and the Guarantor may be discharged from their obligations with respect to the Notes (subject to certain exceptions) or (ii) the Company and the Guarantor may be released from their obligations under specified covenants and agreements in the Indenture, in each case if the Company or the Guarantor irrevocably deposits with the Trustee money or Government Obligations, or a combination thereof, in an amount

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sufficient, without consideration of any reinvestment, to pay and discharge the entire indebtedness on all Notes of this series, and satisfies certain other conditions, all as more fully provided in the Indenture.

This Note shall be governed by and construed in accordance with the laws of the State of New York applicable to agreements and instruments made and to be performed wholly within such State.

All terms used in this Note without definition that are defined in the Indenture shall have the meanings assigned to them in the Indenture.

[Remainder of Page Intentionally Left Blank]

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Unless the Certificate of Authentication hereon has been executed by or on behalf of the Trustee under the Indenture by the manual signature of one of its authorized officers, this Note shall not be entitled to any benefits under the Indenture or be valid or obligatory for any purpose.

IN WITNESS WHEREOF, the Company has caused this instrument to be duly executed under its corporate seal.

Dated: July 31, 2024

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CERTIFICATE OF AUTHENTICATION

This is one of the Securities of the series designated therein referred to in the within-mentioned Indenture.

Dated: July 31, 2024

10

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this instrument, shall be construed as though they were written out in full according to applicable laws or regulations:

Additional abbreviations may also be used though not in the above list.

11

FOR VALUE RECEIVED, the undersigned registered Holder hereby sell(s), assign(s) and transfer(s) unto

[PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE]

[PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE]

the within Note and all rights thereunder, hereby irrevocably constituting and appointing                                 to transfer said Note on the books of the Company with full power of substitution in the premises.

Dated:      

Signature:                

Signature Guaranty:                            

Signatures must be guaranteed by an “eligible guarantor institution” meeting the requirements of the Trustee, which requirements include membership or participation in the Security Transfer Agent Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Trustee in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.

12

Exhibit 5.1

Postfach 1548 | CH-8002 Zürich

To:

Chubb Limited

Bärengasse 32

CH-8001 Zurich

Switzerland

Chubb INA Holdings LLC

436 Walnut Street, WB12B

Philadelphia, Pennsylvania 19106

USA

Zurich, 31 July 2024

Chubb Limited / Chubb INA Holdings LLC - Registration Statement on Form S-3

Ladies and Gentlemen:

We have been asked to render this opinion in our capacity as Swiss counsel to Chubb Limited, a corporation organized under the laws of Switzerland (the “Company”) in connection with the preparation and filing with the Securities and Exchange Commission under the Securities Act of 1933, as amended, of a Registration Statement on Form S-3 (No. 333-227749) (the “Registration Statement”) relating to, among other things Chubb INA Holdings LLC’s (“Chubb INA”) offer and sale of USD 700,000,000 4.650% senior notes due 2029 (the “2029 Notes”) and the USD 600,000,000 5.000% senior notes due 2034 (the “2034 Notes” and, together with the 2029 Notes, the “Notes”), which are fully and unconditionally guaranteed (the “Guarantee”) by the Company.

For the purpose of this opinion letter we have only reviewed and relied on copies of the following documents:

a copy the Indenture dated as of 1 August 1999 (the “Indenture”), among the Company, Chubb INA and The Bank of New York Mellon Trust Company N.A. (formerly known as The Bank of New York Trust Company, N.A., as successor to J.P.

Morgan Trust Company, National Association and The First National Bank of Chicago) as trustee, as amended by the First Supplemental Indenture, dated as of 13 March 2013;

This opinion is confined to and given on the basis of the laws of Switzerland in force at the date hereof as currently applied by Swiss courts. In the absence of explicit statutory law or established case law, we base our opinion solely on our independent professional judgment.

We express no opinion on the laws of any other jurisdiction. The opinions given in this opinion are strictly limited to the matters stated in section III and do not extend, by implication or otherwise, to any agreement or document referred to in the Registration Statement or any other matter.

The opinions given herein are made on the basis of the following assumptions:

Based upon the foregoing, in reliance thereon, and subject to the limitations and assumptions referred to above (II) and the qualifications set out below (IV), we are of the following opinion:

This opinion is subject to the following qualifications:

In this legal opinion, Swiss legal concepts are expressed in English terms and not in their original German language; the concepts concerned may not be identical to the concepts described by the same English terms as they exist under the laws of other jurisdictions; this legal opinion may, therefore, only be relied upon under the express condition that any issues of interpretation or liability arising hereunder will be governed by Swiss law and be subject to the exclusive jurisdiction of the courts of the City of Zurich, Switzerland, venue being Zurich 1.

This legal opinion is rendered solely for the purpose of the transactions herein referred to. It may not be used, circulated, quoted, referred to or relied upon for any other purpose without our written consent in each instance. We hereby consent to the filing of this legal opinion as an exhibit to the Registration Statement. In giving this consent, we do not hereby admit that we are within the category of persons whose consent is required under section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Securities and Exchange Commission promulgated thereunder. This legal opinion is strictly limited to the matters stated in it and does not apply by implication to other matters.

Yours sincerely,

Bär & Karrer AG

		Exhibit 5.2
		Mayer Brown LLP 71 South Wacker Drive Chicago, Illinois 60606-4637
July 31, 2024		Main Tel +1 312 782 0600 Main Fax +1 312 701 7711 www.mayerbrown.com
Chubb Limited Bärengasse 32 Zurich CH-8001 Switzerland   Chubb INA Holdings LLC 436 Walnut Street Philadelphia, PA 19106

Chubb INA Holdings LLC

Registration Statement on Form S-3

Ladies and Gentlemen:

We have represented Chubb Limited, a Swiss company limited by shares (Aktiengesellschaft) (“Chubb”), and Chubb INA Holdings LLC, a Delaware limited liability company (“Chubb INA”) in connection (i) with the preparation and filing with the Securities and Exchange Commission under the Securities Act of 1933, as amended, of a Registration Statement on Form S-3 (No. 333-227749) (the “Registration Statement”) relating to, among other things, Chubb INA’s debt securities, which are fully and unconditionally guaranteed (the “Guarantee”) by Chubb and (ii) the offer and sale of $700,000,000 aggregate principal amount of Chubb INA’s 4.650% Senior Notes due 2029 (the “2029 Notes”) and $600,000,000 aggregate principal amount of Chubb INA’s 5.000% Senior Notes due 2034 (the “2034 Notes” and, together with the 2029 Notes, the “Notes”). The 2034 Notes will constitute a further issuance of, will be consolidated with and will form a single series with Chubb INA’s outstanding 5.000% Senior Notes due 2034 issued by Chubb INA on March 7, 2024. Upon completion of the offering, an aggregate principal amount of $1,600,000,000 of the 2034 Notes will be outstanding.

In rendering the opinions expressed herein, we have examined (i) the Indenture, dated as of August 1, 1999 (the “Indenture”), among Chubb, Chubb INA and The Bank of New York Mellon Trust Company, N.A. (formerly known as The Bank of New York Trust Company, N.A., as successor to J.P. Morgan Trust Company, National Association and The First National Bank of Chicago), as trustee (the “Trustee”), as supplemented from time to time; (ii) the Notes and (iii) the Guarantee.

In addition, we have examined such other documents, certificates and opinions, and have made such further investigation as we have deemed necessary or appropriate for the purposes of the opinions expressed below. In expressing the opinions set forth below, we have assumed the genuineness of all signatures, the conformity to the originals of all documents reviewed by us as

Mayer Brown is a global services provider comprising an association of legal practices that are separate entities including

Mayer Brown LLP (Illinois, USA), Mayer Brown International LLP (England & Wales), Mayer Brown (a Hong Kong partnership)

and Tauil & Chequer Advogados (a Brazilian law partnership).

copies, the authenticity and completeness of all original documents reviewed by us in original or copy form and the legal competence of each individual executing any document. As to all parties other than Chubb INA, we have assumed the due authorization, execution and delivery of all documents, and, with respect to all parties other than Chubb INA and Chubb, we have assumed the validity and enforceability of all documents against all parties thereto, other than Chubb INA and Chubb, in accordance with their respective terms.

As to questions of fact material to our opinions (but not as to legal conclusions), we have, to the extent we deemed such reliance appropriate, relied upon certificates and other statements of officers of Chubb INA and Chubb and of public officials issued with respect to Chubb INA and Chubb.

Based upon and subject to the foregoing, and having regard for legal considerations which we deem relevant, we are of the opinion that:

(i) Chubb INA is a limited liability company validly existing and in good standing under the laws of the State of Delaware;

(ii) the Indenture has been duly authorized, executed and delivered by Chubb INA and (assuming the Indenture has been duly authorized, executed and delivered by Chubb and the Trustee), the Indenture constitutes a valid and binding agreement of Chubb INA and Chubb, enforceable against Chubb INA and Chubb in accordance with its terms, except as (a) the enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles and (b) the enforceability of provisions imposing liquidated damages, penalties or an increase in interest rate upon the occurrence of certain events may be limited in certain circumstances, and will be entitled to the benefits of the Indenture;

(iii) the Notes have been duly authorized and executed by Chubb INA and, assuming the due authentication thereof in the manner provided for in the Indenture and delivery against payment of the consideration therefor, constitute valid and binding obligations of Chubb INA, enforceable against Chubb INA in accordance with their terms, except as (a) the enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws relating to or affecting the rights and remedies of creditors or by general equitable principles and (b) the enforceability of provisions imposing liquidated damages, penalties or an increase in interest rate upon the occurrence of certain events may be limited in certain circumstances, and will be entitled to the benefits of the Indenture; and

(iv) assuming the Guarantee has been duly authorized by Chubb under Swiss law, the Guarantee constitutes a legal, valid and binding obligation of Chubb enforceable against Chubb in accordance with its terms, except as (a) the enforcement thereof may be limited by bankruptcy, insolvency, reorganization, moratorium or other similar laws

relating to or affecting the rights and remedies of creditors or by general equitable principles and (b) the enforceability of provisions imposing liquidated damages, penalties or an increase in interest rate upon the occurrence of certain events may be limited in certain circumstances, and will be entitled to the benefits of the Indenture.

We are admitted to practice in the States of Illinois and New York and our opinions expressed herein are limited solely to the Federal laws of the United States of America, the laws of the States of Illinois and New York and the Limited Liability Act of the State of Delaware, and we express no opinion herein concerning the laws of any other jurisdiction.

The opinions and statements expressed herein are as of the date hereof. We assume no obligation to update or supplement this opinion letter to reflect any facts or circumstances that may hereafter come to our attention or any changes in applicable law which may hereafter occur.

We hereby consent to the incorporation by reference of this opinion as an exhibit to the Registration Statement and to all references to this firm in such Registration Statement. In giving this consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act of 1933, as amended, or the rules and regulations of the Securities and Exchange Commission.

ESB:GAZ:MRD:KFW