MREO Mereo BioPharma Group PLC

Exhibit 1.1

Mereo BioPharma Group plc

(a public limited company incorporated under the laws of England and Wales)

12,531,300 American Depositary Shares

Representing 62,656,500 Ordinary Shares

UNDERWRITING AGREEMENT

June 14, 2024

Jefferies LLC

Leerink Partners LLC

Cantor Fitzgerald & Co.

as Representatives of the several Underwriters

c/o Jefferies LLC

520 Madison Avenue

New York, NY 10022

c/o Leerink Partners LLC

1301 Avenue of the Americas, 12^th Floor

New York, NY 10019

c/o Cantor Fitzgerald & Co.

110 East 59^th Street

New York, NY 10022

Ladies and Gentlemen:

Mereo BioPharma Group plc, a public limited company incorporated under the laws of England and Wales with registered number 09481161 (the “Company”), confirms its agreement with Jefferies LLC (“Jefferies”), Leerink Partners LLC (“Leerink Partners”), and Cantor Fitzgerald & Co. (“Cantor”) and each of the underwriters named in Schedule A hereto (collectively, the “Underwriters”, which term shall also include any underwriter substituted as hereinafter provided in Section 10 hereof), for which Jefferies, Leerink Partners and Cantor are acting as representatives (in such capacity, the “Representatives”), with respect to the sale by the Company and the purchase by the Underwriters, of 62,656,500 Ordinary Shares (as defined below), nominal value £0.003 per share to be delivered and for which the Underwriters will subscribe, acting severally and not jointly, in the form of an aggregate of 12,531,300 ADSs (as defined below), each representing five Ordinary Shares (the “Offered Securities”). The Offered Securities and the Ordinary Shares represented thereby (the “Underlying Shares”) are herein collectively called the “Securities”. References in this Agreement to (i) “Ordinary Shares” shall mean ordinary shares of nominal value £0.003 each in the capital of the Company; (ii) “ADSs” shall mean American Depositary Shares representing Ordinary Shares; (iii) the “sale” of any Offered Securities or any similar or analogous expressions shall, unless the context otherwise requires, be understood to include the allotment and issue by the Company of the Underlying Shares to Citibank, N.A., as depositary (the “Depositary”), or its nominee, and the Company procuring the issue of ADSs representing such Underlying Shares by the Depositary or its nominee to the Underwriters; and (iv) the “purchase”, or “payment” for, of any Offered Securities or any similar or analogous expressions shall, unless the context otherwise requires, be understood to refer to the subscription for the Underlying Shares, as well as deposit of the Underlying Shares for ADSs representing such Underlying Shares, and the payment of the subscription moneys in respect of such Underlying Shares.

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The Underlying Shares are to be deposited, and the Offered Securities are to be issued and delivered, pursuant to a deposit agreement (the “Deposit Agreement”), dated as of April 23, 2019, by and among the Company, the Depositary, and all holders and beneficial holders of the ADSs issued thereunder.

The Company understands that the Underwriters propose to make an offering of the Offered Securities as soon as the Representatives deems advisable after this Underwriting Agreement (this “Agreement”) has been executed and delivered.

The Company has prepared and filed with the Securities and Exchange Commission (the “Commission”) a shelf registration statement on Form S-3 (No. 333-279433), including a base prospectus to be used in connection with the offering and sale of the Offered Securities, under the Securities Act of 1933, as amended (the “1933 Act” or the “Securities Act”), and the rules and regulations promulgated thereunder (the “1933 Act Regulations”). Such registration statement, including the amendments thereto, the exhibits thereto and any schedules thereto, at the time it became effective, the documents incorporated by reference therein at such time pursuant to Item 12 of Form S-3 under the 1933 Act and the documents otherwise deemed to be a part thereof as of such time pursuant to Rule 430B under the 1933 Act Regulations (“Rule 430B”), is herein called the “Registration Statement.” Any registration statement filed pursuant to Rule 462(b) of the 1933 Act Regulations is herein called the “Rule 462(b) Registration Statement” and, after such filing, the term “Registration Statement” shall include the Rule 462(b) Registration Statement. Each preliminary prospectus used in connection with the offering of the Offered Securities, including the documents incorporated or deemed to be incorporated by reference therein pursuant to Item 12 of Form S-3 under the 1933 Act, are collectively referred to herein as a “preliminary prospectus.” Where no preliminary prospectus supplement is filed and distributed to investors in connection with the offering, the “preliminary prospectus” shall be deemed to be the prospectus included in the Registration Statement (including any documents incorporated therein by reference) as such has been filed with the Commission at the Applicable Time (defined below). Promptly after execution and delivery of this Agreement, the Company will prepare and file a final prospectus relating to the Offered Securities in accordance with the provisions of Rule 424(b) under the 1933 Act Regulations (“Rule 424(b)”). The final prospectus, in the form first furnished to the Underwriters for use in connection with the offering of the Offered Securities, including the documents incorporated by reference therein, is herein called the “Prospectus.” The Company and the Depositary have filed with the Commission registration statements on Form F-6 (No. 333-223890, 333-249338 and 333-258824), covering the registration of the ADSs under the 1933 Act. The registration statements relating to the ADSs, as amended at the time they became effective, are hereinafter referred to as the “ADS Registration Statements.” The Company has also filed with the Commission, in accordance with Section 12 of the Securities Exchange Act of 1934, as amended (the “1934 Act”), and the rules and regulations of the Commission thereunder (the “1934 Act Regulations”), a registration statement on Form 8-A (File No. 001-38452) under the 1934 Act to register, under Section 12(b) of the 1934 Act, the ADSs and the Ordinary Shares. The registration statement relating to the ADSs and the Ordinary Shares, as amended at the time it became effective, is hereinafter referred to as the “1934 Act Registration Statement.” For purposes of this Agreement, all references to the Registration Statement, the ADS Registration Statement, the 1934 Act Registration Statement, any preliminary prospectus, the Prospectus or any amendment or supplement to any of the foregoing shall be deemed to include the copy filed with the Commission pursuant to its Electronic Data Gathering, Analysis and Retrieval system (“EDGAR”).

As used in this Agreement:

“Applicable Time” means 7:35 A.M., New York City time, on June 14, 2024 or such other time as agreed by the Company and the Representatives.

“General Disclosure Package” means any Issuer General Use Free Writing Prospectuses issued at or prior to the Applicable Time, the most recent preliminary prospectus (including any documents incorporated therein by reference) that is distributed to investors prior to the Applicable Time and the information included on Schedule B-1 hereto, all considered together.

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“Issuer Free Writing Prospectus” means any “issuer free writing prospectus,” as defined in Rule 433 of the 1933 Act Regulations (“Rule 433”) relating to the Offered Securities, including without limitation any “free writing prospectus” (as defined in Rule 405 of the 1933 Act Regulations (“Rule 405”)) that is (i) required to be filed with the Commission by the Company, (ii) a “road show for an offering that is a written communication” within the meaning of Rule 433(d)(8)(i), whether or not required to be filed with the Commission, or (iii) exempt from filing with the Commission pursuant to Rule 433(d)(5)(i) because it contains a description of the Offered Securities or of the offering that does not reflect the final terms, in each case in the form filed or required to be filed with the Commission or, if not required to be filed, in the form retained in the Company’s records pursuant to Rule 433(g).

“Issuer General Use Free Writing Prospectus” means any Issuer Free Writing Prospectus that is intended for general distribution to prospective investors (other than a “bona fide electronic road show,” as defined in Rule 433 (a “Bona Fide Electronic Road Show”)), as evidenced by its being specified in Schedule B-2 hereto.

“Issuer Limited Use Free Writing Prospectus” means any Issuer Free Writing Prospectus that is not an Issuer General Use Free Writing Prospectus.

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

SECTION 1. REPRESENTATIONS AND WARRANTIES.

(a) Representations and Warranties by the Company. The Company represents and warrants to each Underwriter as of the date hereof, the Applicable Time and the Closing Time (as defined below), and agrees with each Underwriter, as follows:

(i) Registration Statements and Prospectuses. The Company meets the requirements to incorporate documents by reference in the Registration Statement pursuant to General Instructions II.F to Form S-3 under the 1933 Act and the 1933 Act Regulations. Each of the Registration Statement and any amendment thereto has become effective under the 1933 Act and the 1933 Act Regulations. No stop order suspending the effectiveness of the Registration Statement or any post-effective amendments thereto has been issued by the Commission under the 1933 Act, no order preventing or suspending the use of any preliminary prospectus or the Prospectus has been issued by the Commission and no proceedings for any of those purposes have been instituted by the Commission or are pending or, to the Company’s knowledge, contemplated by the Commission. The Company has complied with each request (if any) from the Commission for additional information.

The Registration Statement and any post-effective amendments thereto, at the time it became effective, complied in all material respects with the requirements of the 1933 Act and the 1933 Act Regulations. Each preliminary prospectus, the Prospectus and any amendment or supplement thereto, at the time each was filed with the Commission, complied in all material respects with the requirements of the 1933 Act and the 1933 Act Regulations. Each preliminary prospectus delivered to the Underwriters for use in connection with the offering of the Offered Securities and the Prospectus was or will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

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The documents incorporated or deemed incorporated by reference in the Registration Statement and the Prospectus, when they became effective or 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 1934 Act Regulations.

The Registration Statement, any preliminary prospectus and the Prospectus, and the filing of the Registration Statement, any preliminary prospectus and the Prospectus with the Commission have been duly authorized by and on behalf of the Company, and each of the Registration Statement and the ADS Registration Statement has been duly executed by and on behalf of the Company pursuant to such authorization.

(ii) ADS Registration Statement. The ADS Registration Statements have (i) been prepared by the Company in conformity with the requirements of the 1933 Act and the rules and regulations thereunder, (ii) been filed with the Commission under the 1933 Act, and (iii) become effective under the 1933 Act. The Commission has not issued any order suspending the effectiveness of any ADS Registration Statement, and no proceeding for that purpose has been instituted or, to the Company’s knowledge, threatened by the Commission. Each ADS Registration Statement, at the time it became effective under the 1933 Act, (i) conformed in all respects to the requirements of the 1933 Act and the rules and regulations thereunder and (ii) and did not, as of the applicable effective date, 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.

(iii) Accurate Disclosure. None of the Registration Statement, the ADS Registration Statements and any amendment thereto, at its effective time, at the Closing Time, contained, contains or will contain an untrue statement of a material fact or omitted, omits or will omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading. As of the Applicable Time, none of (A) the General Disclosure Package or (B) any individual Issuer Limited Use Free Writing Prospectus, when considered together with the General Disclosure Package, included, includes or will include an untrue statement of a material fact or omitted, omits 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. Neither the Prospectus nor any amendment or supplement thereto (including any prospectus wrapper), as of its issue date, at the time of any filing with the Commission pursuant to Rule 424(b), at the Closing Time, included, includes or will include an untrue statement of a material fact or omitted, omits 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. The documents incorporated or deemed to be incorporated by reference in the Registration Statement, the General Disclosure Package and the Prospectus, at the time the Registration Statement became effective or when such documents incorporated by reference were filed with the Commission, as the case may be, when read together with the other information in the Registration Statement, the General Disclosure Package or the Prospectus, as the case may be, did not and will not include 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.

The representations and warranties in this subsection shall not apply to statements in or omissions from the Registration Statement (or any amendment thereto), the ADS Registration Statement (or any amendment thereto), the General Disclosure Package or the Prospectus (or any amendment or supplement thereto, including any prospectus wrapper) made in reliance upon and in conformity with written information furnished to the Company by any Underwriter through the Representatives expressly for use therein. For purposes of this Agreement, the only information so furnished shall be the information in the statements set forth in the first two sentences of the first paragraph under the section entitled “Commission and Expenses”; and the first two paragraphs under the section entitled “Stabilization,” in each case under the caption “Underwriting” contained in the Prospectus (collectively, the “Underwriter Information”).

(iv) Issuer Free Writing Prospectuses. No Issuer Free Writing Prospectus conflicts or will conflict with the information contained in the Registration Statement or the Prospectus, including any document incorporated by reference therein, and any preliminary or other prospectus deemed to be a part thereof that has not been superseded or modified. Any Issuer Free Writing Prospectus that the Company

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is required to file pursuant to Rule 433(d) under the Securities Act has been, or will be, filed with the Commission in accordance with the requirements of the 1933 Act and the 1933 Act Regulations. Each Issuer Free Writing Prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) under the 1933 Act or that was prepared by or behalf of or used or referred to by the Company complies or will comply in all material respects with the requirements of the 1933 Act and the 1933 Act Regulations.

(v) Company Not Ineligible Issuer. At the time of filing the Registration Statement and any post-effective amendments thereto, at the earliest time thereafter that the Company or another offering participant made a bona fide offer (within the meaning of Rule 164(h)(2) of the 1933 Act Regulations) of the Offered Securities and at the date hereof, the Company was not and is not an “ineligible issuer,” as defined in Rule 405, without taking account of any determination by the Commission pursuant to Rule 405 that it is not necessary that the Company be considered an ineligible issuer.

(vi) Emerging Growth Company Status. From the time of the initial filing of the Registration Statement with the Commission through the date hereof, the Company has been and is an “emerging growth company,” as defined in Section 2(a) of the Securities Act (an “Emerging Growth Company”); provided however, the Company shall no longer be an Emerging Growth Company on December 31, 2024.

(vii) Stamp Taxes. No stamp duty, stamp duty reserve, registration, documentary, issuance, transfer or other similar taxes or duties (“Transfer Taxes”) are payable in the United States or United Kingdom by or on behalf of the Underwriters in connection with (i) the issuance and the delivery of the Underlying Shares in the manner contemplated by this Agreement, (ii) the issuance, delivery and sale of the Offered Securities (or the American Depositary Receipts (“ADRs”) evidencing such Offered Securities) to or for the account of the Underwriters in the manner contemplated by this Agreement or the Deposit Agreement, (iii) the sale and delivery by the Underwriters of the Offered Securities (or the ADRs evidencing such Offered Securities) to the initial purchasers thereof as contemplated herein, or (iv) the execution and delivery of this Agreement or the Deposit Agreement.

(viii) Dividends and Distributions. Except as described in the General Disclosure Package and the Prospectus, all dividends and other distributions declared and payable on the Ordinary Shares may under applicable English law and regulations be paid to the Depositary in pounds sterling and may be converted into foreign currency that may be transferred out of the United Kingdom in accordance with the Deposit Agreement. Except as disclosed in the Prospectus, no subsidiary of the Company (each, a “Subsidiary” and, collectively, the “Subsidiaries”) is prohibited or restricted, directly or indirectly, from paying dividends to the Company, or from making any other distribution with respect to such Subsidiary’s equity securities or from repaying to the Company or any other Subsidiary of the Company any amounts that may from time to time become due under any loans or advances to such subsidiary from the Company or from transferring any property or assets to the Company or to any other Subsidiary.

(ix) Independent Accountants. The accountants who certified the audited financial statements of the Company included or incorporated by reference in the Registration Statement and the Prospectus are an independent registered public accounting firm as required by, and delivered their report thereon in compliance with, the Securities Act and the Public Company Accounting Oversight Board (United States) (“PCAOB”), and which is registered as a public accounting firm as defined by the PCAOB whose registration has not been suspended or revoked and who has not requested such registration to be withdrawn.

(x) Financial Statements. The consolidated financial statements of the Company included or incorporated by reference in the Registration Statement, the General Disclosure Package and the Prospectus, together with the related notes, comply as to form in all material respects with Regulation S-X under the Securities Act and present fairly, in all material respects, the financial position of the Company and its consolidated Subsidiaries at the dates indicated and the results of operations and cash flows of the Company and its consolidated Subsidiaries for the periods specified; said financial statements have been prepared in conformity with generally accepted accounting principles accepted in the United States of America (“GAAP”) applied on a consistent basis throughout the periods involved except as may be

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expressly stated in the related notes thereto. The interactive data in eXtensible Business Reporting Language incorporated by reference in the Registration Statement, the General Disclosure Package and the Prospectus fairly presents the information called for in all material respects and has been prepared in accordance with the Commission’s rules and guidelines applicable thereto. No other financial statements or supporting schedules are required to be included in the Registration Statement, the General Disclosure Package or the Prospectus. The financial data set forth in each of the Registration Statement, the General Disclosure Package and the Prospectus fairly presents the information set forth therein on a basis consistent with that of the audited financial statements contained in the Registration Statement, the General Disclosure Package and the Prospectus. To the Company’s knowledge, no person who has been suspended or barred from being associated with a registered public accounting firm, or who has failed to comply with any sanction pursuant to Rule 5300 promulgated by the PCAOB, has participated in or otherwise aided the preparation of, or audited, the financial statements, supporting schedules or other financial data filed with the Commission as a part of the Registration Statement, the General Disclosure Package and the Prospectus.

(xi) Compliance with the Sarbanes-Oxley Act of 2002. There is and has been no failure on the part of the Company or any of the Company’s directors or officers, in their capacities as such, to comply in all material respects with any applicable provision of the Sarbanes-Oxley Act of 2002 and the rules and regulations promulgated in connection therewith, including Section 402 related to loans and Sections 302 and 906 related to certifications.

(xii) No Material Adverse Effect to Business. Except as otherwise stated therein, since the respective dates as of which information is given in the Registration Statement, the General Disclosure Package or the Prospectus, (A) there has been no material adverse change in the condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company and its Subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business (a “Material Adverse Effect”), (B) there have been no transactions entered into by the Company or any of its Subsidiaries, other than those in the ordinary course of business, which are material with respect to the Company and its Subsidiaries considered as one enterprise, (C) there have been no material liabilities or obligations, direct or contingent, entered into by the Company or any of its Subsidiaries and (D) there has been no dividend or distribution of any kind declared, paid or made by the Company or any of its Subsidiaries on any class of share capital, or any repurchase or redemption by the Company or any of its Subsidiaries of any class of share capital.

(xiii) Incorporation and Good Standing of the Company. The Company has been duly incorporated and is validly existing as a public limited company under the laws of England and Wales and has corporate or similar power and authority to own, lease and operate its properties and to conduct its business as described in the Registration Statement, the General Disclosure Package and the Prospectus and to enter into and perform its obligations under this Agreement; and the Company is duly qualified as a foreign corporation to transact business and is in good standing (to the extent such concept applies) in each other jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure to be so qualified or to be in good standing would not reasonably be expected to result in a Material Adverse Effect.

(xiv) Incorporation/Organization and Good Standing of the Company’s Subsidiaries. Each Subsidiary has been duly incorporated or organized and is validly existing in good standing (to the extent such concept applies) under the laws of the jurisdiction of its incorporation or organization, has corporate or similar power and authority to own, lease and operate its properties and to conduct its business as described in the Registration Statement, the General Disclosure Package and the Prospectus and is duly qualified to transact business and is in good standing (to the extent such concept applies) in each jurisdiction in which such qualification is required, whether by reason of the ownership or leasing of property or the conduct of business, except where the failure to be so qualified or to be in good standing (to the extent such concept applies) would not reasonably be expected to result in a Material Adverse Effect. Except as otherwise disclosed in the Registration Statement, the General Disclosure Package and the Prospectus, all of the issued and outstanding share capital or capital stock or other equity ownership interests (as applicable) of each Subsidiary has been duly authorized and validly issued, is fully

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paid and non-assessable (to the extent such concept applies) and is owned by the Company, directly or through Subsidiaries, free and clear of any security interest, mortgage, pledge, lien, encumbrance, claim or equity. The constitutive or organizational documents of each Subsidiary comply in all material respects with the requirements of applicable laws of its jurisdiction of incorporation and are in full force and effect. None of the issued share capital or capital stock of any Subsidiary was issued in violation of the preemptive or similar rights of any securityholder of such Subsidiary. The only Subsidiaries of the Company are the entities listed on Exhibit 21.1 to the Company’s Annual Report on Form 10-K, as filed with the Commission, for its most recently completed fiscal year.

(xv) Capitalization. (i) The issued and outstanding share capital of the Company is as set forth in the Registration Statement, the General Disclosure Package and the Prospectus. The issued and outstanding Ordinary Shares of the Company have been duly authorized and are validly issued and fully paid and no further contribution of capital in respect of such Ordinary Shares will be required to be made to the Company by the holders of such shares by reason solely of them being such holders. The issued and outstanding ADSs have been duly authorized and are validly issued. None of the issued and outstanding Ordinary Shares of the Company was issued in violation of the preemptive or other similar rights of any securityholder of the Company. (ii) The Underlying Shares may be issued to the Custodian or its nominee against payment therefor to the Company following which the Depositary will issue ADSs against the deposit of the Underlying Shares and at the time of issue such issuance of Underlying Shares will be within all authorizations of the directors for the issuance of Ordinary Shares under the U.K. Companies Act 2006 (the “CA 2006”). Upon due issuance by the Depositary of the ADSs against the deposit of the Underlying Shares in respect thereof in accordance with the provisions of the Deposit Agreement, such ADSs will be duly and validly issued and the persons in whose names the ADSs are registered will be entitled to the rights specified therein and in the Deposit Agreement. Except as disclosed in the Registration Statement, the allotment and issue of the Underlying Shares in the form of ADSs by the Company and the deposit of the Underlying Shares with the Depositary or its nominee and the issuance of the ADSs representing such Underlying Shares as contemplated by this Agreement and the Deposit Agreement will not trigger any anti-dilution or preemptive or similar rights of any holder of any Ordinary Shares or ADSs, securities convertible into or exchangeable or exercisable for Ordinary Shares or ADSs or options, warrants or other rights to purchase Ordinary Shares or ADSs or any other securities of the Company with respect to such Ordinary Shares, ADSs, securities, options, warrants or rights, save for any rights of preemption under the CA 2006 that will, at the time of allotment of the Underlying Shares, have been validly waived or disapplied. The Deposit Agreement and the ADSs conform in all material respects to each description thereof in the Registration Statement, the General Disclosure Package and the Prospectus. Each holder of ADSs issued pursuant to the Deposit Agreement shall be entitled, subject to the Deposit Agreement, to seek enforcement of its rights in a direct suit, action or proceeding against the Company. (iii) There are no authorized or outstanding options, warrants, preemptive rights, rights of first refusal or other rights to purchase, or equity or debt securities convertible into or exchangeable or exercisable for, any Ordinary Shares of the Company or its Subsidiaries other than those described in the Registration Statement, the General Disclosure Package and the Prospectus.

(xvi) This Agreement. The Company has the corporate power to enter into this Agreement and this Agreement has been duly authorized, executed and delivered by the Company.

(xvii) Authorization and Description of Ordinary Shares. The Company and its directors have the power and authority to allot and issue, and have authorized the allotment and issuance of, the Underlying Shares, to be delivered at the Closing Time pursuant to this Agreement and no further sanction or consent by any securityholder of the Company (including under section 551 of the CA 2006) is required in connection therewith and, when such Underlying Shares are issued and allotted by the Company to the Depositary’s custodian (or its nominee) and the ADSs are issued and delivered pursuant to the Deposit Agreement against payment of the consideration therefor, those ADSs (and the Underlying Shares) will be validly issued and fully paid without any encumbrance or call for payment of further capital; and at the Closing Time, the issuance of the Underlying Shares will not be subject to the preemptive or other similar rights of any securityholder of the Company (including under section 561 of the CA 2006), or any such rights will have been validly disapplied. The Underlying Shares will rank equally in all respects with the existing Ordinary Shares. The Ordinary Shares will conform in all material respects to all statements relating thereto contained in the Registration Statement, the General Disclosure Package and the Prospectus and such description conforms in all material respects to the rights set forth in the instruments defining the same.

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(xviii) Authorization of Deposit Agreement. The Deposit Agreement has been duly authorized, executed and delivered by the Company and, assuming due authorization, execution and delivery by the Depositary, constitutes a valid and legally binding obligation of the Company, enforceable in accordance with its terms, except as rights to indemnification thereunder may be limited by applicable law and public policy considerations and subject, as to enforceability, to bankruptcy, insolvency, reorganization, moratorium and similar laws of general applicability relating to or affecting creditors’ rights and to general equity principles; upon due issuance by the Depositary of the ADSs against the deposit of the Underlying Shares in respect thereof in accordance with the provisions of the Deposit Agreement, such ADSs will be duly and validly issued, and the persons in whose names the ADSs are registered will be entitled to the rights specified therein, respectively, and in the Deposit Agreement; and the Deposit Agreement and the ADSs conform in all material respects to the descriptions thereof contained in the Registration Statement, the General Disclosure Package and the Prospectus. There has been no change in the Company’s agreement with the Depositary in connection with any pre-release of the ADSs and no such change is currently contemplated.

(xix) Registration Rights. There are no persons with registration rights or other similar rights to have any securities registered for sale pursuant to the Registration Statement or otherwise registered for sale or sold by the Company under the Securities Act pursuant to this Agreement, other than those rights that have been disclosed in the Registration Statement, the General Disclosure Package and the Prospectus and have been waived.

(xx) Absence of Violations, Defaults and Conflicts. Neither the Company nor any Subsidiary is (A) in violation of its articles of association, charter, by-laws or similar constitutive or organizational document, (B) 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 Company or any Subsidiary is a party or by which either of them may be bound or to which any of the properties or assets of the Company or any Subsidiary is subject (collectively, “Agreements and Instruments”), or (C) in violation of any applicable law, statute, rule, regulation, judgment, order, writ or decree of any arbitrator, court, governmental body, regulatory body, administrative agency or other authority, body or agency having jurisdiction over the Company or its Subsidiaries or any of their respective properties, assets or operations (each, a “Governmental Entity”), except in the case of each of (B) and (C) above, for such defaults or violations that would not, singly or in the aggregate, reasonably be expected to result in a Material Adverse Effect. The execution, delivery and performance of this Agreement and the performance of the Deposit Agreement and the consummation of the transactions contemplated herein or therein and in the Registration Statement, the General Disclosure Package and the Prospectus (including the allotment and issuance of the Underlying Shares and Offered Securities and deposit with the Custodian or its nominee of the Underlying Shares and the use of the proceeds from the sale of the Offered Securities as described therein under the caption “Use of Proceeds”) and compliance by the Company with its obligations hereunder have been duly authorized by all necessary corporate action by the Company 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 properties or assets of the Company or its Subsidiaries pursuant to, the Agreements and Instruments (except for such conflicts, breaches, defaults or Repayment Events or liens, charges or encumbrances that would not, singly or in the aggregate, result in a Material Adverse Effect), nor will such action result in any violation of the provisions of the charter, by-laws or similar organizational document of the Company or its Subsidiaries or any law, statute, rule, regulation, judgment, order, writ or decree of any Governmental Entity. As used herein, a “Repayment Event” means any event or condition which 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 Company or its Subsidiaries.

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(xxi) Stock Exchange Listing. Except as disclosed in the Registration Statement, the General Disclosure Package or the Prospectus the ADSs are registered pursuant to Section 12(b) of the 1934 Act and are listed on The Nasdaq Capital Market (the “Principal Market”) and the Company has taken no action designed to, or likely to have the effect of, terminating the registration of the ADSs under the 1934 Act or delisting the ADSs from the Principal Market, nor has the Company received any notification that the Commission or the Principal Market is contemplating terminating such registration or listing. To the Company’s knowledge, it is in compliance with all applicable listing requirements of the Principal Market.

(xxii) Absence of Labor Dispute. No labor dispute with the employees of the Company or its Subsidiaries exists or, to the knowledge of the Company, is imminent, and the Company is not aware of any existing or imminent labor disturbance by the employees of any of its or its Subsidiaries’ principal suppliers, manufacturers, customers or contractors, which, in either case, would reasonably be expected to result in a Material Adverse Effect.

(xxiii) Absence of Monitoring Agreements. Neither the Company nor any of its Subsidiaries is a party to any corporate integrity agreements, monitoring agreements, consent decrees, settlement orders, or similar agreements with or imposed by any governmental or regulatory authority. The Company and each of its Subsidiaries is in compliance with all applicable U.S. or non-U.S. laws, rules, regulations, orders and decrees governing its business and the regulation of pharmaceuticals or biohazardous substances or materials, including without limitation the U.S. federal Food, Drug and Cosmetic Act, U.S. data privacy and securities laws and U.S. health care fraud and abuse laws, except where noncompliance would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(xxiv) Absence of Further Requirements. No filing with, or authorization, approval, consent, license, order, registration, qualification or decree of, any Governmental Entity is necessary or required for the performance by the Company of its obligations hereunder, in connection with the offering, allotment or issuance of the Offered Securities or the issuance and deposit with the Custodian or its nominee of the Underlying Shares hereunder or the consummation of the transactions contemplated by this Agreement, except such as have been already obtained or as may be required under the Securities Act, the rules of the Principal Market, state securities laws or the rules of the Financial Industry Regulatory Authority, Inc. (“FINRA”).

(xxv) Possession of Licenses and Permits. The Company and each of its Subsidiaries possess all licenses, certificates, authorizations and permits issued by, and has made all declarations and filings with, the appropriate U.S. or non-U.S. governmental or regulatory authorities of competent jurisdiction (including, without limitation, the FDA, the EMA or comparable U.S. or non-U.S. governmental authorities of competent jurisdiction) that are necessary for the ownership or lease of their respective properties or the conduct of their respective businesses as described in the Registration Statement, the General Disclosure Package and the Prospectus (collectively, the “Governmental Permits”), except where any failures to possess or make the same would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. The Company and its Subsidiaries are in compliance with all such Governmental Permits, and all such Governmental Permits are valid and in full force and effect, except where such non-compliance, invalidity or failure to be in full force and effect would not reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect. Neither the Company nor any Subsidiary has received written notification of any revocation, modification, suspension, termination or invalidation (or proceedings related thereto) of any such Governmental Permit and the Company has no knowledge that any such Governmental Permit requiring renewal will not be renewed, except where any revocation, modification, suspension, termination or invalidation (or proceedings related thereto) would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect. The Company and each of its Subsidiaries have filed, obtained, maintained or submitted all material reports, documents, forms, notices, applications, records, claims, submissions and supplements or amendments as required by any applicable laws or Governmental Permits, and all such material reports, documents, forms, notices, applications, records, claims, submissions and supplements or amendments were complete and accurate on the date filed in all material respects (or were materially corrected or supplemented by a subsequent submission), except where the failure to so file, obtain, maintain or submit, or such incompleteness or inaccuracy, would not reasonably be expected to have a Material Adverse Effect.

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(xxvi) Company Studies and Trials. The studies, tests and preclinical studies or clinical trials conducted by or on behalf of the Company and its Subsidiaries that are described in the Prospectus (the “Company Studies and Trials”) were and, if still pending, are being conducted, to the Company’s knowledge, in all material respects in accordance with applicable laws and regulations; the descriptions of the results of the Company Studies and Trials contained in the Registration Statement, the General Disclosure Package and the Prospectus are, to the Company’s knowledge, accurate in all material respects; except to the extent disclosed in the Registration Statement, the General Disclosure Package and the Prospectus, the Company has no knowledge of any other studies or trials not described in the Prospectus, the results of which materially call into question the results described or referred to in the Prospectus when viewed in the context in which such results are described and the clinical state of development; and except to the extent disclosed in the Registration Statement, the General Disclosure Package and the Prospectus, the Company has not received any written notices or correspondence from the FDA, the EMA or comparable U.S. or non-U.S. governmental authorities of competent jurisdiction requiring the termination, suspension or material modification of any Company Studies and Trials where such termination, suspension or material modification would reasonably be expected to have a Material Adverse Effect.

(xxvii) Relationships. There are no business relationships or related-party transactions involving the Company or any Subsidiary or any other person required to be described in the Registration Statement, the General Disclosure Package or the Prospectus which have not been described as required.

(xxviii) Title to Property. The Company and its Subsidiaries do not own any real property and any material real property and buildings held under lease by the Company and its Subsidiaries is held by them under valid, subsisting and enforceable leases with such exceptions as are not material and do not materially interfere with the use made and proposed to be made of such property by the Company and its Subsidiaries. The Company and its Subsidiaries have good title to all other properties owned by them, in each case, free and clear of all mortgages, pledges, liens, security interests, claims, restrictions or encumbrances of any kind except such as (A) are described in the Registration Statement, the General Disclosure Package and the Prospectus or (B) would not, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect; and all of the leases and subleases material to the business of the Company and its Subsidiaries, considered as one enterprise, and under which the Company or its Subsidiaries holds properties described in the Registration Statement, the General Disclosure Package or the Prospectus, are in full force and effect, and neither the Company nor any such Subsidiary has received any notice of any material claim of any sort that has been asserted by anyone adverse to the rights of the Company or any Subsidiary under any of the leases or subleases mentioned above, or affecting or questioning the rights of the Company or such Subsidiary to the continued possession of the leased or subleased premises under any such lease or sublease.

(xxix) Title to Intellectual Property; Privacy and Data Protection. Except as disclosed in the Registration Statement, the General Disclosure Package or the Prospectus and except as would not individually or in the aggregate reasonably be expected to have a Material Adverse Effect, (i) the Company and each of its Subsidiaries solely owns or otherwise possesses the valid right to use all (A) patents, patent applications, trademarks, trademark registrations, service marks, service mark registrations, Internet domain name registrations, copyrights, copyright registrations, licenses and trade secret rights and (B) inventions, software, works of authorships, trademarks, service marks, trade names, databases, formulae, know how, Internet domain names and all other intellectual property (including trade secrets and other unpatented and/or unpatentable proprietary confidential information, systems, or procedures) and all rights associated with any of the foregoing in any jurisdiction ((A) and (B) collectively, “Intellectual Property Rights”) that are necessary to conduct their respective businesses as currently conducted, or otherwise used or held for use in, their respective businesses as currently conducted, and as proposed to be conducted as described in the Registration Statement, the General Disclosure Package or the Prospectus, (ii) to the Company’s knowledge, the Company’s and its respective Subsidiaries’ businesses as now conducted and as proposed to be conducted as described in the Registration Statement, the General Disclosure Package or the Prospectus do not and will not give rise to any infringement of, any

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misappropriation of, or other violation of, any valid and enforceable Intellectual Property Rights of any other Person, and neither the Company nor any of its respective Subsidiaries has in the past 3 years infringed, misappropriated, or otherwise violated, any Intellectual Property Rights of any other Person, and the Intellectual Property of the Company has not been adjudged by a court of competent jurisdiction to be invalid or unenforceable, in whole or in part, and the Company is unaware of any facts which would form a reasonable basis for any such adjudication by a court of competent jurisdiction that any Intellectual Property Rights of the Company in the United States are invalid or unenforceable or in the case of any Intellectual Property Rights in territories outside the United States would be wholly invalid or unenforceable, (iii) there are no third parties who have any rights to the Intellectual Property Rights described in the Registration Statement, the General Disclosure Package or the Prospectus as being owned by or exclusively licensed to the Company or any of its Subsidiaries (collectively, and together with all other Intellectual Property Rights owned by the Company or exclusively licensed to the Company or any of its Subsidiaries, the “Company Intellectual Property Rights”), including no liens, security interests, or other encumbrances, except for customary reversionary rights of third-party licensors with respect to Intellectual Property Rights that are disclosed as licensed to the Company or one or more of its Subsidiaries and non-exclusive licenses of Intellectual Property Rights granted by the Company or its Subsidiaries in the ordinary course of business, (iv) to the Company’s knowledge, there is no infringement, misappropriation or other violation by third parties of any Company Owned IP (as defined below), (v) there is no pending, and neither the Company nor or any of its Subsidiaries has received written notice of any threatened, action, suit, proceeding, or claim against the Company or any of its Subsidiaries (A) alleging the infringement, misappropriation or other violation, or the infringement, misappropriation or other violation upon commercialization of any product or service described in the Registration Statement, the General Disclosure Package or the Prospectus as under development, by the Company or any of its Subsidiaries of any Intellectual Property Right of any Person; or (B) challenging the ownership, validity, enforceability, patentability or scope of any Company Intellectual Property Rights or other Intellectual Property Rights owned by, or to the Company’s knowledge, exclusively licensed to, the Company or any of its Subsidiaries (collectively, “Company Owned IP”), or to the Company’s knowledge, exclusively licensed to, the Company or any of its Subsidiaries, including no interferences, oppositions, reexaminations, or government proceedings, and the Company is unaware of any facts which would form a reasonable basis for any such action, suit, proceeding, or claim, (vi) the Company and its Subsidiaries maintain commercially reasonable policies and procedures designed to protect the security, integrity and privacy of personally identifiable information (“Protected Information”), as defined under any applicable law and have taken all reasonable steps to protect, maintain and safeguard the confidentiality of any confidential Company Owned IP, including the execution of appropriate nondisclosure, confidentiality agreements and invention assignments with their employees, (vii) the Company and its Subsidiaries are presently and were in the past 3 years at all times in compliance in all material respects with all applicable U.S. and/or non-U.S. laws relating to privacy, data protection, data security, or the collection and use of personal information collected, used, or held for use by the Company or any of its Subsidiaries, or on behalf of the Company or any of its subsidiaries, in the conduct of their respective businesses there has been no unauthorized access to, or any unauthorized use, disclosure, losses or theft of, or security breaches relating to, any Protected Information received, or transmitted, by, on behalf of, or in the possession, custody or control of the Company or any of its Subsidiaries, (viii) no claims have been asserted or threatened in writing against the Company or any of its Subsidiaries alleging a violation of any person’s privacy or personal information or data rights, (ix) the Company and each of its Subsidiaries solely owns all right, title and interest in and to all Intellectual Property Rights created or otherwise developed by any present or former employee, consultant or contractor of the Company or any of its Subsidiaries in the course of his, her, or its employment or other relationship with the Company or such Subsidiaries, free of any restrictions on the use or ownership of such Intellectual Property Rights, (x) the Company Owned IP is subsisting, in full force and effect, is being duly maintained, and, to the Company’s knowledge, if issued or registered, is valid and enforceable or contains valid and enforceable claims, (xi) to the Company’s knowledge, no employee of the Company is in or has been in violation of any term of any employment contract, patent disclosure agreement, invention assignment agreement, non-competition agreement, non-solicitation agreement, nondisclosure agreement, or any restrictive covenant to or with a former employer where the basis of such violation relates to such employee’s employment with the Company, and (xii) none of the Company owned Intellectual Property or technology (including information technology and outsourced arrangements) employed by the Company or its subsidiaries has been obtained or is being used by the Company or its subsidiary in violation of any contractual obligation binding on the Company or its subsidiaries or any of their respective officers, directors or employees or otherwise in violation of the rights of any persons.

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(xxx) Patents and Patent Applications. All patents and patent applications owned by or licensed to the Company or under which the Company has rights have, to the knowledge of the Company, been duly and properly filed and maintained; to the knowledge of the Company, the parties prosecuting such patent applications have complied or will comply with their duty of candor and disclosure to the USPTO in connection with such applications; and the Company is not aware of any facts required to be disclosed to the USPTO that were not disclosed to the USPTO and which would preclude the grant of a patent in connection with any such application or would reasonably be expected to form the basis of a finding of invalidity with respect to any patents that have issued with respect to such applications. To the Company’s knowledge, all patents and patent applications owned by the Company and filed with the USPTO or any foreign or international patent authority (the “Company Patent Rights”) and all patents and patent applications in-licensed by the Company and filed with the USPTO or any foreign or international patent authority (the “In-licensed Patent Rights”) have been duly and properly filed; the Company believes it has complied or will comply with its duty of candor and disclosure to the USPTO for the Company Patent Rights and, to the Company’s knowledge, the licensors of the In-licensed Patent Rights have complied with their duty of candor and disclosure to the USPTO for the In-licensed Patent Rights.

(xxxi) FDA Compliance. Except as described in the Registration Statement, the General Disclosure Package and the Prospectus, the Company: (A) is and at all times has been in material compliance with all statutes, rules or regulations of the FDA and other comparable Governmental Entities applicable to the ownership, testing, development, manufacture, packaging, processing, use, distribution, marketing, labeling, promotion, sale, offer for sale, storage, import, export or disposal of any product under development, manufactured or distributed by the Company (“Applicable Laws”); (B) has not received any FDA Form 483, notice of adverse finding, warning letter, untitled letter or other correspondence or notice from the FDA or any Governmental Entity alleging or asserting material noncompliance with any Applicable Laws or any licenses, certificates, approvals, clearances, exemptions, authorizations, permits and supplements or amendments thereto required by any such Applicable Laws (“Authorizations”); (C) possesses all material Authorizations and such Authorizations are valid and in full force and effect and the Company is not in material violation of any term of any such Authorizations; (D) has not received notice of any claim, action, suit, proceeding, hearing, enforcement, investigation, arbitration or other action from the FDA or any Governmental Entity or third party alleging that any product operation or activity is in material violation of any Applicable Laws or Authorizations and has no knowledge that the FDA or any Governmental Entity or third party is considering any such claim, litigation, arbitration, action, suit, investigation or proceeding; (E) has not received notice that the FDA or any Governmental Entity has taken, is taking or intends to take action to limit, suspend, modify or revoke any material Authorizations and has no knowledge that the FDA or any Governmental Entity is considering such action; and (F) has filed, obtained, maintained or submitted all material reports, documents, forms, notices, applications, records, claims, submissions and supplements or amendments as required by any Applicable Laws or Authorizations and that all such reports, documents, forms, notices, applications, records, claims, submissions and supplements or amendments were materially complete and correct on the date filed (or were corrected or supplemented by a subsequent submission).

(xxxii) Compliance with Health Care Laws. The Company has operated and currently is in material compliance with all applicable health care laws, rules and regulations, including, without limitation, (i) the Federal, Food, Drug and Cosmetic Act (21 U.S.C. §§ 301 et seq.) and Public Health Service Act (42 U.S.C. §§ 262 et seq.); (ii) all applicable federal, state, local and foreign healthcare related fraud and abuse laws, including, without limitation, the federal Anti-kickback Statute (42 U.S.C. § 1320a-7b(b)), the U.S. Physician Payments Sunshine Act (42 U.S.C. § 1320a-7h), the civil False Claims Act (31 U.S.C. §§ 3729 et seq.), the criminal False Claims Law (42 U.S.C. § 1320a-7b(a)), all criminal laws relating to healthcare fraud and abuse, including but not limited to 18 U.S.C. Sections 286 and 287, the healthcare fraud criminal provisions under the U.S. Health Insurance Portability and Accountability Act of 1996 (“HIPAA”) (42 U.S.C. Section 1320d et seq.), the exclusions law (42 U.S.C. § 1320a-7), and the civil monetary penalties law (42 U.S.C. § 1320a-7a); (iii) HIPAA, as amended by the Health Information Technology for Economic Clinical Health Act (42 U.S.C. Section 17921 et seq.); (iv) Medicare (Title XVIII

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of the Social Security Act); (v) Medicaid (Title XIX of the Social Security Act); (vi) the Patient Protection and Affordable Care Act (Pub. Law 111-148), as amended by the Health Care and Education Affordability Reconciliation Act of 2010 (Pub. Law 111-152); (vii) the regulations promulgated pursuant to such laws; and (viii) any other local, state, federal, or foreign health care laws applicable to the Company, including those relating to the ownership, testing, development, manufacture, packaging, processing, use, distribution, marketing, advertising, labeling, promotion, sale, offer for sale, storage, import, export or disposal of any product manufactured or distributed by or for the Company (collectively, the “Health Care Laws”). Neither the Company, nor to the Company’s knowledge, any of its officers, directors, employees or agents have engaged in activities which are, as applicable, cause for false claims liability, civil penalties, or mandatory or permissive exclusion from Medicare, Medicaid, or any other state or federal healthcare program. The Company has not received written notice or other correspondence of any claim, action, suit, audit, survey, proceeding, hearing, enforcement, investigation, arbitration or other action from any court or arbitrator or governmental or regulatory authority or third party alleging that any product operation or activity is in violation of any Health Care Laws, and, to the Company’s knowledge, no such claim, action, suit, proceeding, hearing, enforcement, investigation, arbitration or other action is threatened. The Company is not a party to and does not have any ongoing reporting obligations pursuant to any corporate integrity agreement, deferred prosecution agreement, monitoring agreement, consent decree, settlement order, plan of correction or similar agreement imposed by any governmental or regulatory authority. Additionally, neither the Company nor any of its employees, officers, directors or, to the Company’s knowledge, its agents, has been excluded, suspended or debarred from participation in any U.S. state or federal health care program or human clinical research or is subject to a governmental inquiry, investigation, proceeding, or other similar action that could reasonably be expected to result in debarment, suspension, or exclusion.

(xxxiii) Environmental Laws. Except as described in the Registration Statement, the General Disclosure Package and the Prospectus or would not, singly or in the aggregate, reasonably be expected to result in a Material Adverse Effect, (A) neither the Company nor any Subsidiary is in violation of any federal, state, local or foreign statute, law, rule, regulation, ordinance, code, policy or rule of common law or any judicial or administrative interpretation thereof, including any judicial or administrative order, consent, decree or judgment, relating to pollution or protection of human health, the environment (including, without limitation, ambient air, surface water, groundwater, land surface or subsurface strata) or wildlife, including, without limitation, laws and regulations relating to the release or threatened release of chemicals, pollutants, contaminants, wastes, toxic substances, hazardous substances, petroleum or petroleum products, asbestos-containing materials or mold (collectively, “Hazardous Materials”) or to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of Hazardous Materials (collectively, “Environmental Laws”), (B) the Company and its Subsidiaries have all permits, authorizations and approvals required under any applicable Environmental Laws and are each in compliance with their requirements, (C) there are no pending or, to the knowledge of the Company, threatened, administrative, regulatory or judicial actions, suits, demands, demand letters, claims, liens, notices of noncompliance or violation, investigation or proceedings relating to any Environmental Law against the Company or any Subsidiary and (D) there are no events or circumstances that would reasonably be expected to form the basis of an order for clean-up or remediation, or an action, suit or proceeding by any private party or Governmental Entity, against or affecting the Company or any Subsidiary relating to Hazardous Materials or any Environmental Laws.

(xxxiv) Accounting Controls and Disclosure Controls. The Company and its Subsidiaries make and keep accurate books and records and maintain effective internal control over financial reporting (as defined under Rule 13a-15 and 15d-15 under the 1934 Act) and a system of internal accounting controls sufficient to provide reasonable assurances that (A) transactions are executed in accordance with management’s general or specific authorization; (B) transactions are recorded as necessary to permit preparation of financial statements in conformity with GAAP and to maintain accountability for assets; (C) access to assets is permitted only in accordance with management’s general or specific authorization; (D) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences; and (E) the interactive data in eXtensible Business Reporting Language incorporated by reference in the Registration Statement and the Prospectus fairly presents the information called for in all material respects and is prepared in accordance with the Commission’s rules and guidelines applicable thereto. Except as described in the

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Registration Statement, the General Disclosure Package and the Prospectus, since the end of the Company’s most recent audited fiscal year, there has been (1) no material weakness in the Company’s internal control over financial reporting (whether or not remediated) and (2) no change in the Company’s internal control over financial reporting that has materially adversely affected, or is reasonably likely to materially adversely affect, the Company’s internal control over financial reporting. The Company maintains disclosure controls and procedures (as defined in Rule 13a-15 and Rule 15d-15 under the 1934 Act) that are designed to ensure that information required to be disclosed by the Company in the reports that it files or submits under the 1934 Act is recorded, processed, summarized and reported, within the time periods specified in the Commission’s rules and forms, and is accumulated and communicated to the Company’s management, including its principal executive officer or officers and principal financial officer or officers, as appropriate, to allow timely decisions regarding disclosure.

(xxxv) Payment of Taxes. All tax returns of the Company and its Subsidiaries required by law to be filed have been timely filed (taking into account any properly requested extensions which have been obtained) pursuant to applicable U.S. or non-U.S. (including United Kingdom), state, local or other law (and were when filed, and remain, complete and correct), except insofar as the failure to file such tax returns would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect. The Company and its Subsidiaries have timely paid all taxes required to be paid by any of them and, if due and payable, any related or similar assessment, fine or penalty levied against any of them, except (i) as are being contested in good faith and as to which adequate reserves have been established by the Company or its Subsidiary (as applicable) in conformity with GAAP or (ii) insofar as the failure to pay would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect. The Company and its Subsidiaries do not have any tax deficiencies or claims outstanding or assessed or, to the Company’s knowledge, proposed against them except as would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect. The charges, accruals and reserves on the books of the Company in respect of any tax liability for any years not finally determined are, in conformity with GAAP, adequate to meet any assessments or re-assessments for additional tax for any years not finally determined, except to the extent of any inadequacy that would not, individually or in the aggregate, reasonably be expected to result in a Material Adverse Effect.

(xxxvi) Insurance. Except as disclosed in the Registration Statement, the General Disclosure Package or the Prospectus, the Company and its Subsidiaries carry or are entitled to the benefits of insurance, with financially sound and reputable insurers, in such amounts and covering such risks as is generally maintained by companies of established repute and similar size engaged in the same or similar business, and all such insurance is in full force and effect. The Company has no reason to believe that it or its Subsidiaries will not be able (A) to renew its existing insurance coverage as and when such policies expire or (B) to obtain comparable coverage from similar institutions as may be necessary or appropriate to conduct its business as now conducted and at a cost that would not reasonably be expected to result in a Material Adverse Effect. Neither the Company nor any of its Subsidiaries has been denied any insurance coverage which it has sought or for which it has applied.

(xxxvii) Investment Company Act. The Company is not required, and upon the allotment and issuance of the Underlying Shares and the deposit with the Custodian or its nominee of the Underlying Shares as herein contemplated and the application of the net proceeds therefrom as described in the Registration Statement, the General Disclosure Package and the Prospectus will not be required, to register as an “investment company” under the Investment Company Act of 1940, as amended (the “Investment Company Act”).

(xxxviii) Absence of Manipulation. Neither the Company nor, to the Company’s knowledge, any Affiliate (as used herein, as defined in Rule 405 of the 1933 Act Regulations) of the Company has taken, nor will the Company or any Affiliate take, directly or indirectly, any action which is designed, or would reasonably be expected, to cause or result in, or which constitutes, the stabilization or manipulation of the price of any security of the Company to facilitate the sale or resale of the Offered Securities or to result in a violation of Regulation M under the 1934 Act (“Regulation M”). Neither the Company, nor any of its Subsidiaries, nor any person acting on its or their behalf (save for the Underwriters, in respect of whom no representation is provided) will take, directly or indirectly, any action designed to

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cause or to result in, or that has constituted or that might reasonably be expected to cause or result in, the stabilization of the Offered Securities in violation of applicable European Union or English laws or manipulation of the price of any security of the Company to facilitate the sale or resale of the Offered Securities.

(xxxix) Anti-Corruption Laws. None of the Company, its Subsidiaries or to the knowledge of the Company, any director, officer, agent, employee, Affiliate or other person acting on behalf of the Company or its Subsidiaries (i) has used any corporate funds for any unlawful contribution, gift, entertainment, or other unlawful expense relating to political activity; (ii) is aware of or has taken any action, directly or indirectly, in furtherance of an offer, payment, promise to pay or authorization of the payment of any money, or other property, gift, promise to give, or authorization of the giving of anything of value to any foreign or domestic government official or employee, including of any government-owned or controlled entity or public international organization, or any political party or official thereof, or any candidate for political office; (iii) has violated or is in violation of the U.S. Foreign Corrupt Practices Act of 1977, as amended, and the rules and regulations thereunder (the “FCPA”), the UK Bribery Act 2010, or any other applicable anti-bribery or anti-corruption law; and (iv) made, offered, authorized, requested, or taken an act in furtherance of any unlawful bribe, rebate, payoff, influence payment, kickback or other unlawful payment or benefit. The Company and its subsidiaries have conducted their business in compliance with applicable anti-corruption laws and have instituted and maintain policies and procedures designed to ensure, and which are reasonably expected to continue to ensure, continued compliance therewith.

(xl) Money Laundering Laws. The operations of the Company and its Subsidiaries are and have been conducted at all times in compliance with applicable financial recordkeeping and reporting requirements of the Currency and Foreign Transactions Reporting Act of 1970, as amended, the money laundering statutes of all applicable jurisdictions, the rules and regulations thereunder and any related or similar rules, regulations or guidelines, issued, administered or enforced by any Governmental Entity (collectively, the “Money Laundering Laws”); and no action, suit or proceeding by or before any Governmental Entity involving the Company or its Subsidiaries with respect to the Money Laundering Laws is pending or, to the knowledge of the Company, threatened.

(xli) Sanctions. None of the Company, its Subsidiaries or to the knowledge of the Company, any director, officer, agent, employee, Affiliate or representative is a Person that is currently the subject or target of any sanctions administered or enforced by the United States Government (including, without limitation, the U.S. Department of the Treasury’s Office of Foreign Assets Control, or the U.S. Department of State), the United Nations Security Council, the European Union, His Majesty’s Treasury, or other relevant sanctions authority (collectively, “Sanctions”), nor is the Company or any of its Subsidiaries located, organized or resident in a country or territory that is the subject or target of Sanctions including, without limitation, the Crimea Region of Ukraine, the so-called Donetsk People’s Republic, the so-called Luhansk People’s Republic, Cuba, Iran, North Korea, and Syria; and the Company will not directly or indirectly use the proceeds of the sale of the Securities, or lend, contribute or otherwise make available such proceeds to any Subsidiary, joint venture partners or other Person, to fund any activities of or business with any Person, or in any country or territory, that, at the time of such funding, is the subject or target of Sanctions or in any other manner that will result in a violation by any Person (including any Person participating in the transaction, whether as agent, advisor, investor or otherwise) of Sanctions. For the past five years, the Company and its subsidiaries have not knowingly engaged in and are not now knowingly engaged in any dealings or transactions with any Person, or with any country or territory, that at the time of the dealing or transaction is or was the subject or target of Sanctions.

(xlii) Lending Relationship. Except as disclosed in the Registration Statement, the General Disclosure Package and the Prospectus, the Company (i) does not have any material lending or other material relationship with any banking or lending Affiliate of the Underwriters and (ii) does not intend to use any of the proceeds from the sale of the Offered Securities to repay any outstanding debt owed to any Affiliate of any Underwriters.

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(xliii) Statistical and Market-Related Data. Any statistical and market-related data included in the Registration Statement, the General Disclosure Package or the Prospectus are based on or derived from sources that the Company believes, after reasonable inquiry, to be reliable and accurate in all material respects and, to the extent required, the Company has obtained the written consent to the use of such data from such sources.

(xliv) No Rated Securities. The Company has no debt securities or preferred stock that is rated by any “nationally recognized statistical rating organization” (as that term is defined by the Commission for purposes of Rule 436(g)(2) under the Securities Act).

(xlv) Privacy and Data Protection. The Company and its Subsidiaries have operated their business in a manner compliant in all material respects with all Privacy Laws, and the Company and its subsidiaries have taken commercially reasonable actions to prepare to comply with, and since May 25, 2018, have been and currently are compliant in all material aspects with, the European Union General Data Protection Regulation (“GDPR”) (EU 2016/679) including the GDPR as it forms part of United Kingdom law by virtue of section 3 of the European Union (Withdrawal) Act 2018. The Company and its Subsidiaries have been and are in compliance in all material respects with internal policies and procedures designed to ensure the integrity, availability and security of the data collected, handled, stored or otherwise processed in connection with its business and with all external privacy policies and notices, and all such notices have been legally adequate and accurate; the Company and its Subsidiaries have been and are in compliance in all material respects with internal policies and procedures designed to ensure compliance with the Privacy Laws and Health Care Laws that govern privacy and data security and take, and have taken, commercially reasonable steps designed to assure compliance with such policies and procedures. The Company, its Subsidiaries, and, to the their knowledge, any third parties processing information on behalf of the Company have taken commercially reasonable steps to maintain the confidentiality of its Personal Information, protected health information, consumer information and other confidential information of the Company, its Subsidiaries and any third parties in its possession or control (collectively, “Sensitive Company Data”). The Company and its Subsidiaries have contractually obligated all third parties that process Sensitive Company Data on their behalf to data protection obligations that comply with applicable Privacy Laws, including (i) to comply with applicable Privacy Laws, (ii) to take reasonable steps to protect and security Sensitive Company Data, and (iii) to act only in accordance with the instructions of the Company. The tangible or digital information technology systems (including computers, screens, servers, workstations, routers, hubs, switches, networks, data communications lines, technical data and hardware), software and telecommunications systems used or held for use by the Company and its Subsidiaries (the “Company IT Assets”) are adequate and operational for, in accordance with their documentation and functional specifications, the business of the Company and its Subsidiaries as now operated and as currently proposed to be conducted as described in the Registration Statement, the General Disclosure Package and the Prospectus. The Company, its Subsidiaries, and, to the their knowledge, any third-parties processing information on behalf of the Company have used commercially reasonable efforts to establish, and have established, commercially reasonable disaster recovery and security plans, procedures and facilities for the business consistent with industry standards and practices in all material respects, including, without limitation, for the Company IT Assets and data held or used by or for the Company and its Subsidiaries. The Company and its Subsidiaries have not suffered or incurred any security breaches, compromises or incidents with respect to any Company IT Asset, except where such breaches, compromises or incidents would not reasonably be expected to, singly or in the aggregate, result in a Material Adverse Effect; and, there has been no unauthorized or illegal use of or access to any Company IT Asset by any unauthorized third party. The Company and its Subsidiaries have not been required to notify any individual, regulator or other third party of any information security breach, compromise or incident involving Sensitive Company Data.

(xlvi) No Broker Fees. Except as disclosed in the General Disclosure Package and the Prospectus, there are no contracts, agreements or understandings between the Company and any Person that would give rise to a valid claim against the Company or the Agent for a brokerage commission, finder’s fee or other like payment in connection with the offering of the Securities contemplated hereby.

(xlvii) Valid Choice of Laws. The choice of the laws of the State of New York as the governing law of this Agreement is a valid choice of law under the laws of England and Wales and will be recognized by courts in England and Wales except as may be limited by general principles of equity and

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except where to do so would be inconsistent with or overridden by the Regulation (EC) No 593/2008 on the Law Applicable to Contractual Obligations (Rome I) (as it forms part of English domestic law pursuant to European Union (Withdrawal) Act 2018). The Company has the corporate power to submit, and pursuant to Section 17 of this Agreement, has legally, validly, effectively and irrevocably submitted, to the personal jurisdiction of each New York State and United States federal court sitting in The City of New York, New York (each, a “New York Court”) and has validly and irrevocably waived any objection to the laying of venue of any suit, action or proceeding brought in any such court; and the Company has the power to designate, appoint and empower an authorized agent for service of process in any action arising out of or relating to this Agreement, the Registration Statement, the General Disclosure Package, the Prospectus or the offering of the Offered Securities in any New York Court and service of process effected on such authorized agent will be effective to notify the Company of any action under this Agreement.

(xlviii) No Sovereign Immunity. Neither the Company nor any of its Subsidiaries nor any of their respective properties, assets or revenues enjoy any rights of immunity from legal proceedings or the execution of judgement or other attachment in England and Wales, pursuant to the State Immunity Act 1978, or the United States, pursuant to the Foreign Sovereign Immunities Act 1976, with respect to this Agreement, the Deposit Agreement or the Offered Securities.

(xlix) Proper Form. This Agreement and the Deposit Agreement are each in proper form to be enforceable in England and Wales in accordance with its terms; to ensure the legality, validity, enforceability or admissibility into evidence in England and Wales of this Agreement or the Deposit Agreement it is not necessary that this Agreement or the Deposit Agreement, respectively, be filed or recorded with any court or other authority in England and Wales (other than court filings in the ordinary course of proceedings).

(l) Enforceability of Judgment. Any final judgment for a fixed or readily calculable sum of money rendered by a New York Court having jurisdiction under its own domestic laws and recognized by the English courts as having jurisdiction (according to English conflicts of laws principles and rules of English private international law at the time when proceedings were initiated) to give such final judgment in respect of any suit, action or proceeding against the Company based upon this Agreement or the Deposit Agreement and any instruments or agreements entered into for the consummation of the transactions contemplated herein and therein would generally be enforceable against the Company, without re-examination or review of the merits of the cause of action in respect of which the original judgment was given or re-litigation of the matters adjudicated upon, by the courts of England and Wales; provided, however, that the Company may have defenses open to it and enforcement may not be permitted if, among other things, (a) the judgment was obtained by fraud, or in proceedings contrary to natural or substantial justice, or contravenes public policy in England or the Human Rights Act 1998 (or any subordinate legislation made thereunder, to the extent applicable); (b) the judgment is for a sum payable in respect of taxes, or other charges of a like nature or is in respect of a fine or other penalty or otherwise based on a foreign law that an English court considers to relate to a penal, revenue or other public law; (c) the judgment amounts to judgment on a matter previously determined by an English court or conflicts with a judgment on the same matter given by a court other than a New York Court or was obtained in breach of a jurisdiction or arbitration clause except with the agreement of the defendant or the defendant’s subsequent submission to the jurisdiction of the court; (d) the judgment is given in proceedings brought in breach of an agreement for the settlement of disputes; (e) the judgment has been arrived at by doubling, trebling or otherwise multiplying a sum assessed as compensation for the loss or damage sustained, or is a judgment that is otherwise specified in section 5 of the Protection of Trading Interests Act 1980, or is a judgment based on measures designated by the Secretary of State under section 1 of that Act; and (f) enforcement proceedings are not commenced within six years of the date of such judgment.

(li) No Immunity from Suit. Except as provided by laws or statutes generally applicable to transactions of the type described in this Agreement, neither the Company nor any of its respective properties, assets or revenues has any right of immunity under United Kingdom, New York or United States law, from any legal action, suit or proceeding, from the giving of any relief in any such legal action, suit or proceeding, from set-off or counterclaim, from the jurisdiction of any law of the United Kingdom, New York or United States federal court, from service of process, attachment upon or prior

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judgment, or attachment in aid of execution of judgment, or from execution of a judgment, or other legal process or proceeding for the giving of any relief or for the enforcement of a judgment, in any such court, with respect to its obligations, liabilities or any other matter under or arising out of or in connection with this Agreement or the Deposit Agreement. To the extent that the Company or any of its respective properties, assets or revenues may have or may hereafter become entitled to any such right of immunity in any such court in which proceedings may at any time be commenced, the Company waives or will waive such right to the extent permitted by law and has consented to such relief and enforcement as provided in Section 17 of this Agreement.

(lii) Parties to Lock-Up Agreements. The Company has furnished to the Underwriters a letter agreement in the form attached hereto as Exhibit A (the “Lock-up Agreement”) from each of its directors and executive officers and certain shareholders. If any additional persons shall become directors or executive officers of the Company prior to the end of the 60 day period from the date of the Prospectus, the Company shall cause each such person, prior to or contemporaneously with their appointment or election as a director or executive officer of the Company, to execute and deliver to the Representatives a Lock-up Agreement.

(liii) PFIC Status. The Company does not believe it was a “passive foreign investment company,” or PFIC, for U.S. federal income tax purposes, as defined in Section 1297 of the U.S. Internal Revenue Code of 1986, as amended, for the Company’s taxable year ended December 31, 2023. For the avoidance of doubt, the Company makes no representation with respect to its PFIC status for the Company’s current taxable year or any particular taxable year in the future.

(liv) FINRA Matters. All of the information provided to the Underwriters or to counsel for the Underwriters by the Company and, to the Company’s knowledge, its counsel, its officers and directors and the holders of any securities (debt or equity) or options to acquire any securities of the Company in connection with the offering of the Offered Securities is true, complete, correct and compliant in all material respects with FINRA rules and any letters, filings or other supplemental information provided to FINRA pursuant to FINRA Rules or NASD Conduct Rules is true, complete and correct in all material respects. As of the date of this Agreement, the Company meets the definition of the term “experienced issuer” specified in FINRA Rule 5110(j)(6).

(lv) Forward-Looking Statements. Each financial or operational projection or other “forward-looking statement” (as defined by Section 27A of the Securities Act or Section 21E of the 1934 Act) contained in the Registration Statement, the General Disclosure Package or the Prospectus (i) was so included by the Company in good faith and with reasonable basis after due consideration by the Company of the underlying assumptions, estimates and other applicable facts and circumstances and (ii) is accompanied by meaningful cautionary statements identifying those factors that could cause actual results to differ materially from those in such forward-looking statement. No such statement was made with the knowledge of an executive officer or director of the Company that it was false or misleading.

(lvi) Accuracy of Exhibits. There are no contracts or documents which are required to be described in the Registration Statement, the General Disclosure Package or the Prospectus or to be filed as exhibits to the Registration Statement which have not been so described and filed as required.

Any certificate signed by any officer or representative of the Company or any Subsidiary and delivered to the Underwriters or counsel for the Underwriters in connection with an issuance of Offered Securities shall be deemed a representation and warranty by the Company to the Underwriters as to the matters covered thereby on the date of such certificate.

The Company acknowledges that the Underwriters and, for purposes of the opinions to be delivered pursuant to Sections 5(b) and 5(c) hereof, counsel to the Company and counsel to the Underwriters, will rely upon the accuracy and truthfulness of the foregoing representations and hereby consents to such reliance.

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SECTION 2. SALE AND DELIVERY TO UNDERWRITERS; CLOSING.

(a) Offered Securities. On the basis of the representations and warranties herein contained and subject to the terms and conditions herein set forth, the Company agrees to cause the Depositary or its nominee to allot and issue to each Underwriter, severally and not jointly, and each Underwriter, severally and not jointly, agrees to subscribe for, at the price per ADS set forth in Schedule A, that number of Offered Securities set forth in Schedule A opposite the name of such Underwriter (representing the number of Underlying Shares set forth therein), plus any additional number of Offered Securities which such Underwriter may become obligated to purchase pursuant to the provisions of Section 10 hereof, subject, in each case, to such adjustments among the Underwriters as the Representatives in their sole discretion shall make to eliminate any sales or purchases of fractional ADSs.

(b) [Reserved]

(c) Payment. Payment of the subscription price for the Offered Securities (and the allotment and issue of the Underlying Shares represented thereby against the undertaking to pay such subscription price pursuant to this Section 2(c)) and the delivery of the Offered Securities shall be made at the offices of Cooley LLP, or at such other place as shall be agreed upon by the Representatives and the Company, at 9:00 A.M. (New York City time) on the first (second, if the pricing occurs after 4:30 P.M. (New York City time) on any given day) business day after the date hereof (unless postponed in accordance with the provisions of Section 10), or such other time not later than ten business days after such date as shall be agreed upon by the Representatives and the Company (such time and date of payment and delivery being herein called “Closing Time”). Delivery of the Offered Securities at the Closing Time shall be made through the facilities of The Depository Trust Company (“DTC”) unless the Representatives shall otherwise instruct, to the DTC accounts of the Underwriters and in such denominations as the Representatives shall request.

Payment of the subscription monies due in respect of the Underlying Shares shall be made to the Company by wire transfer of immediately available funds to a bank account designated by the Company immediately at the Closing Time upon the satisfaction of all conditions to be performed or satisfied at or prior to the Closing Time, and the Company shall as soon as possible after receipt thereof against the Representatives undertaking to pay the subscription monies due in respect of the relevant Underlying Shares pursuant to this Section 2(c), issue the relevant number of Underlying Shares to the Custodian and procure the delivery of the Offered Securities, as the case may be, to the Underwriters as soon as possible thereafter.

It is understood that each Underwriter has authorized Jefferies, for its account, to accept delivery of, receipt for, and make payment of the purchase price for, the Offered Securities which it has agreed to purchase. Jefferies, may (but shall not be obligated to) make payment of the purchase price for the Offered 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.

(d) Registration. The ADSs evidencing the Offered Securities shall be registered in such names and in such denominations as the Representatives may request not less than one full business day prior to the Closing Time.

SECTION 3. COVENANTS OF THE COMPANY. The Company covenants with each Underwriter as follows:

(a) Compliance with Securities Regulations and Commission Requests. The Company, subject to Section 3(b), will comply with the requirements of Rule 430B, and will notify the Representatives as soon as practicable, and confirm the notice in writing, (i) when any post-effective amendment to the Registration Statement or any ADS Registration Statement shall become effective or any amendment or supplement to the Prospectus shall have been filed, (ii) of the receipt of any comments from the Commission, (iii) of any request by the Commission for any amendment to the Registration Statement or any ADS Registration Statement or any amendment or supplement to the Prospectus (including any document incorporated by reference therein) or for additional information, (iv) of the issuance by the Commission of any stop order suspending the effectiveness of the Registration Statement or any

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post-effective amendment or of any order preventing or suspending the use of any preliminary prospectus or the Prospectus, or of the suspension of the qualification of the Offered 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(d) or 8(e) of the 1933 Act concerning the Registration Statement or any ADS Registration Statement and (v) if the Company becomes the subject of a proceeding under Section 8A of the 1933 Act in connection with the offering of the Offered Securities. The Company will effect all filings required under Rule 424(b), 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 it deems necessary to ascertain promptly whether the form of prospectus transmitted for filing under Rule 424(b) was received for filing by the Commission and, in the event that it was not, it will promptly file such prospectus. The Company will make every reasonable effort to prevent the issuance of any stop order, prevention or suspension and, if any such order is issued, to obtain the lifting thereof at the earliest possible moment.

(b) Continued Compliance with Securities Laws. The Company 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 Offered Securities as contemplated in this Agreement and in the Registration Statement, the General Disclosure Package and the Prospectus. If at any time when a prospectus relating to the Offered Securities is (or, but for the exception afforded by Rule 172 of the 1933 Act Regulations (“Rule 172”), would be) required by the 1933 Act to be delivered in connection with sales of the Offered 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, to (i) amend the Registration Statement or any ADS Registration Statement in order that the Registration Statement will not include 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, (ii) amend or supplement the General Disclosure Package or the Prospectus in order that the General Disclosure Package or the Prospectus, as the case may be, will not include any 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 (iii) amend the Registration Statement or any ADS Registration Statement or amend or supplement the General Disclosure Package or the Prospectus, as the case may be, in order to comply with the requirements of the 1933 Act or the 1933 Act Regulations, the Company will promptly (A) give the Representatives notice of such event, (B) prepare any amendment or supplement as may be necessary to correct such statement or omission or to make the Registration Statement, any ADS Registration Statement, the General Disclosure Package or the Prospectus comply with such requirements and, a reasonable amount of time prior to any proposed filing or use, furnish the Representatives with copies of any such amendment or supplement and (C) file with the Commission any such amendment or supplement; provided that the Company shall not file or use any such amendment or supplement to which the Representatives or counsel for the Underwriters shall reasonably object. The Company will furnish to the Underwriters such number of copies of such amendment or supplement as the Underwriters may reasonably request. The Company has given the Representatives notice of any filings made pursuant to the 1934 Act or the 1934 Act Regulations within 48 hours prior to the Applicable Time; the Company will give the Representatives notice of its intention to make any such filing from the Applicable Time to the Closing Time and will furnish the Representatives with copies of any such documents a reasonable amount of time prior to such proposed filing, as the case may be, and will not file or use any such document to which the Representatives or counsel for the Underwriters shall reasonably object.

(c) Delivery of Registration Statements. The Company has furnished or will deliver to the Representatives and counsel for the Underwriters, without charge, signed copies of the Registration Statement, any ADS Registration Statement and the 1934 Act Registration Statement, each as originally filed and each amendment thereto (including exhibits filed therewith or incorporated by reference therein and documents incorporated or deemed incorporated by reference therein) and signed copies of all consents and certificates of experts, and will also deliver to the Representatives, without charge, a conformed copy of the Registration Statement as originally filed and each amendment thereto (without exhibits) for each of the Underwriters. The copies of the Registration Statement, any ADS Registration Statement, the 1934 Act Registration Statement and each amendment thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

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(d) Delivery of Prospectuses. The Company has delivered to each Underwriter, without charge, as many copies of each preliminary prospectus as such Underwriter reasonably requested, and the Company hereby consents to the use of such copies for purposes permitted by the 1933 Act. The Company will furnish to each Underwriter, without charge, during the period when a prospectus relating to the Offered Securities is (or, but for the exception afforded by Rule 172, would be) required to be delivered under the 1933 Act, such number of copies of the Prospectus (as amended or supplemented) as such Underwriter may reasonably request. The Prospectus and any amendments or supplements thereto furnished to the Underwriters will be identical to the electronically transmitted copies thereof filed with the Commission pursuant to EDGAR, except to the extent permitted by Regulation S-T.

(e) Blue Sky Qualifications. The Company will use commercially reasonable efforts, in cooperation with the Underwriters, to qualify the Offered Securities for offering and sale under the applicable securities laws of such states and other jurisdictions (domestic or foreign) as the Representatives may reasonably designate and to maintain such qualifications in effect so long as required to complete the distribution of the Offered Securities; provided, however, that the Company shall not be obligated to file any general consent to service of process or to qualify as a foreign corporation or as a dealer in securities in any jurisdiction in which it is not so qualified or to subject itself to taxation in respect of doing business in any jurisdiction in which it is not otherwise so subject.

(f) Rule 158. 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 to the Underwriters the benefits contemplated by, the last paragraph of Section 11(a) of the 1933 Act.

(g) Use of Proceeds. The Company will use the net proceeds received by it from the sale of the Offered Securities in all material respects in the manner specified in the Registration Statement, the General Disclosure Package and the Prospectus under the heading “Use of Proceeds.”

(h) Listing. The Company will use its reasonable best efforts to maintain the listing for ADSs issued and sold by the Company on Principal Market.

(i) Restriction on Sale of Securities. During a period of 60 days from the date of the Prospectus, the Company will not, without the prior written consent of the Representatives, (i) directly or indirectly, offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase or otherwise transfer or dispose of any ADSs or Ordinary Shares or any securities convertible into or exercisable or exchangeable for ADSs or Ordinary Shares or file any registration statement under the 1933 Act with respect to any of the foregoing, (ii) enter into any swap or any other agreement or any transaction that transfers, in whole or in part, directly or indirectly, the economic consequence of ownership of ADSs or Ordinary Shares, whether any such swap or transaction described in clause (i) or (ii) above is to be settled by delivery of ADSs or Ordinary Shares or such other securities, in cash or otherwise or (iii) publicly announce an intention to effect any such swap, agreement or other transaction described in clauses (i) and (ii). The foregoing sentence shall not apply to (A) the Offered Securities to be sold hereunder and the Underlying Shares to be deposited with the Depositary or its nominee in connection therewith; (B) any ADSs or Ordinary Shares issued by the Company or the Depositary under, or upon the exercise of any option, warrant, convertible note or other instrument, or contingent value right, in each case, outstanding on the date hereof and referred to in the Registration Statement, the General Disclosure Package and the Prospectus; (C) any ADSs or Ordinary Shares issued or options to purchase ADSs or Ordinary Shares or other awards granted pursuant to any existing director or employee benefit plan, stock ownership plan or dividend reinvestment plan of the Company referred to in the Registration Statement, the General Disclosure Package and the Prospectus; (D) any ADSs or Ordinary Shares issued in connection with any joint venture, commercial or collaborative relationship or the acquisition or license by the Company of the securities, business, property or other assets of another person or entity or pursuant to any employee benefit plan as assumed by the Company in connection with any such acquisition; provided that any ADSs and Ordinary Shares issued under this clause (D) shall not in the aggregate exceed five percent (5%) of the Company’s outstanding share capital immediately following the consummation of the offering or the Offered Securities contemplated by this Agreement, (E) the filing by

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the Company of any registration statement on Form S-8 or a successor form thereto or (F) the offer and sale of ADSs under the Company’s Open Market Sale Agreement^SM, dated as of May 15, 2024, by and between the Company and Jefferies.

(j) Reporting Requirements. The Company, during the period when a Prospectus relating to the Offered Securities is (or, but for the exception afforded by Rule 172, would be) required to be delivered under the 1933 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 1934 Act Regulations. Additionally, the Company shall report the use of proceeds from the issuance of the Offered Securities as may be required under Rule 463 under the 1933 Act.

(k) Issuer Free Writing Prospectuses. The Company agrees that, unless it obtains the prior written consent of the Representatives, it will not make any offer relating to the Offered Securities that would constitute an Issuer Free Writing Prospectus or that would otherwise constitute a “free writing prospectus,” or a portion thereof, required to be filed by the Company with the Commission or retained by the Company under Rule 433; provided that the Representatives will be deemed to have consented to the Issuer Free Writing Prospectuses listed on Schedule B-2 hereto and any “road show that is a written communication” within the meaning of Rule 433(d)(8)(i) that has been reviewed by the Representatives. The Company represents that it has treated or agrees that it will treat each such free writing prospectus consented to, or deemed consented to, by the Representatives as an “issuer free writing prospectus,” as defined in Rule 433, and that it has complied and will comply with the applicable requirements of Rule 433 with respect thereto, including timely filing with the Commission where required, legending and record keeping. 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, any preliminary prospectus or the 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 existing at that subsequent time, not misleading, the Company will promptly notify the Representatives 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.

(l) Deposit of Underlying Shares. The Deposit Agreement shall be in full force and effect and the Company and the Depositary shall have taken all actions to permit the deposit of underlying Ordinary Shares and the issuance of the ADSs in accordance with the Deposit Agreement.

(m) Emerging Growth Company Status. The Company will promptly notify the Representatives if the Company ceases to be an Emerging Growth Company at any time prior to the later of (i) completion of the distribution of the Offered Securities within the meaning of the 1933 Act and (ii) completion of the 60-day restricted period referred to in Section 3(i).

(n) Deductions or Withholdings. All sums payable by the Company under this Agreement shall be paid free and clear of and without deductions or withholdings for or on account of any and all present or future taxes, levies, imposts or duties, unless the deduction or withholding is required by applicable law, in which case the Company shall pay such additional amount as will result in the receipt by each Underwriter of the full amount that would have been received had no deduction or withholding been made, except to the extent of withholding or deduction for (i) any income, capital gains or franchise taxes that would not have been imposed but for a present or former connection between an Underwriter and the jurisdiction imposing such taxes or duties, other than as a result of this Agreement and the transactions contemplated hereunder, or (ii) taxes that would not have been imposed but for a failure to comply with a reasonable request in writing for indemnification, documentation or certification required in order to reduce or eliminate such withholding or deduction, other than as a result of any binding confidentiality or other legal obligations of any Underwriter.

(o) Treatment of Value Added Tax. The Company agrees that, if the performance by the Underwriters of any of their obligations under this Agreement shall represent for VAT purposes under any applicable law the making by the Underwriters of any supply of goods or services to the Company (to the

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extent applicable), the Company shall pay to the Underwriters, in addition to the amounts otherwise payable by the Company pursuant to this Agreement, an amount equal to the VAT chargeable on any such supply of goods and services provided that the Underwriters have issued the Company with an appropriate VAT invoice in respect of the supply to which the payment relates. Where a sum is paid or reimbursed to the Underwriters pursuant to this Agreement in respect of any cost, expense or other amount and that cost, expense or other amount includes an amount in respect of irrecoverable VAT (the “VAT Element”), then the Company, to the extent applicable, shall, in addition, pay an amount equal to the VAT Element to the Underwriters. For the purposes of this Agreement, “VAT” means value added tax as provided for in the Value Added Tax Act 1994 (“VATA”) and subordinate legislation made under VATA as amended, modified or re-enacted (whether before or after the date of this Agreement) and any similar sales, consumption, use or turnover tax whether within the United Kingdom or elsewhere in the world.

SECTION 4. PAYMENT OF EXPENSES.

(a) Expenses. The Company will pay or cause to be paid all expenses incidental to the performance of its obligations under this Agreement, including (i) the preparation, printing and filing of the Registration Statement (including financial statements and exhibits) each as originally filed and each amendment thereto, (ii) the preparation, printing and delivery to the Underwriters of copies of each preliminary prospectus, each Issuer Free Writing Prospectus and the Prospectus and any amendments or supplements thereto and any costs associated with electronic delivery of any of the foregoing by the Underwriters to investors, (iii) the preparation, issuance and delivery of the ADSs representing the Offered Securities to the Underwriters, including any Transfer Taxes payable upon the allotment, issuance or delivery of the Offered Securities to the Underwriters in the manner contemplated herein, (iv) the fees and disbursements of the Company’s counsel, accountants and other advisors, (v) the qualification of the Offered Securities (and if necessary, the Underlying Shares) under securities laws in accordance with the provisions of Section 3(e) hereof, including filing fees and the reasonable fees and disbursements of counsel for the Underwriters in connection therewith and in connection with the preparation of a “Blue Sky Survey” and any supplement thereto, (vi) the fees and expenses of any transfer agent, registrar, and/or depositary for the Offered Securities, (vii) the costs and expenses of the Company relating to investor presentations on any “road show” undertaken in connection with the marketing of the Offered Securities, including without limitation, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged by the Company in connection with the road show presentations, travel and lodging expenses of the representatives and officers of the Company and any such consultants, and the cost of aircraft and other transportation chartered in connection with the road show, (viii) the filing fees incident to, and the reasonable fees and disbursements of counsel to the Underwriters in connection with, the review by FINRA of the terms of the sale of the Offered Securities (which fees and expenses of counsel, together with the fees and expenses of counsel described in clause (v) above shall not exceed $25,000 in the aggregate) and (ix) the fees and expenses incurred in connection with the listing of the Offered Securities on the Principal Market.

(b) Termination of Agreement. If this Agreement is terminated by the Representatives in accordance with the provisions of Section 5, Section 9(a)(i), Section 9(a)(iii) or Section 10 hereof, the Company shall reimburse the Underwriters for all of their reasonably documented out-of-pocket expenses, including the reasonable fees and disbursements of counsel for the Underwriters.

SECTION 5. CONDITIONS OF UNDERWRITERS’ OBLIGATIONS. The obligations of the several Underwriters hereunder are subject to the accuracy of the representations and warranties of the Company contained herein or in certificates of any officer of the Company or any of its Subsidiaries delivered pursuant to the provisions hereof, to the performance by the Company of its covenants and other obligations hereunder, and to the following further conditions:

(a) Effectiveness of Registration Statement; Rule 430B Information. The Registration Statement, including any Rule 462(b) Registration Statement, and the ADS Registration Statements have become effective and, at the Closing Time, no stop order suspending the effectiveness of the Registration Statement, the ADS Registration Statements or any post-effective amendment thereto has been issued under the 1933 Act, no order preventing or suspending the use of any preliminary prospectus or the

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Prospectus has been issued and no proceedings for any of those purposes have been instituted or are pending or, to the Company’s knowledge, contemplated; and the Company has complied with each request (if any) from the Commission for additional information to the reasonable satisfaction of counsel to the Underwriters. The Prospectus shall have been filed with the Commission in the manner and within the time frame required by Rule 424(b) without reliance on Rule 424(b)(8) or a post-effective amendment providing such information shall have been filed with, and declared effective by, the Commission in accordance with the requirements of Rule 430B.

(b) Opinion of Counsel for Company. At the Closing Time, the Representatives shall have received the opinion and the negative assurance letter, each dated the Closing Time, of Mayer Brown LLP and Mayer Brown International LLP, U.S. counsel for the Company, together with the opinion of each of Carpmaels & Ransford LLP, Gill Jennings & Every LLP and Wolff IP, P.C., each special counsel for the Company with respect to intellectual property matters, and Latham & Watkins (London) LLP, English counsel for the Company, each substantially in the form as previously agreed with, and satisfactory to, counsel for the Representatives.

(c) Opinion of Counsel for Underwriters. At the Closing Time, the Representatives shall have received the opinion and the negative assurance letter, each dated the Closing Time, of Cooley LLP, counsel for the Underwriters, in substantially the form as previously agreed with, and satisfactory to, the Representatives. Such counsel may also state that, insofar as such opinions involve factual matters, they have relied, to the extent they deem proper, upon certificates of officers and other representatives of the Company and its Subsidiaries and certificates of public officials.

(d) Opinion of Counsel for Depositary. At the Closing Time, the Representatives shall have received the opinion, dated as of the Closing Time, of Patterson Belknap Webb & Tyler LLP, counsel for the Depositary, substantially in the form as previously agreed with, and satisfactory to, the Representatives.

(e) Officers’ Certificate. At the Closing Time, there shall not have been, since the date hereof or since the respective dates as of which information is most recently given in the Registration Statement, the General Disclosure Package or the Prospectus, any Material Adverse Effect, and the Representatives shall have received a certificate of the principal executive officer of the Company and of the principal financial officer of the Company, dated the Closing Time, to the effect that (i) there has been no such Material Adverse Effect, (ii) the representations and warranties of the Company in this Agreement 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 under the 1933 Act has been issued, no order preventing or suspending the use of any preliminary prospectus or the Prospectus has been issued and no proceedings for any of those purposes have been instituted or are pending or, to their knowledge, contemplated.

(f) Depositary’s Certificate. The Depositary shall have furnished or caused to be furnished to the Underwriters a certificate satisfactory to the Representatives of one of its authorized officers with respect to the deposit with it of the Underlying Shares, the issuance of the ADSs evidencing the Underlying Shares pursuant to the Deposit Agreement and other such other customary matters related thereto as the Representatives may reasonably request.

(g) Accountants’ Comfort Letter. At the time of the execution of this Agreement, the Representatives shall have received from PricewaterhouseCoopers LLP a letter, dated such date, in form and substance satisfactory to the Representatives, 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 and certain financial information of the Company contained in the Registration Statement, the General Disclosure Package and the Prospectus.

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(h) Bring-down Comfort Letter. At the Closing Time, the Representatives shall have received from PricewaterhouseCoopers LLP a letter, dated as of the Closing Time, to the effect that they reaffirm the statements made in the letter furnished pursuant to subsection (g) of this Section, except that the specified date referred to shall be a date not more than three business days prior to the Closing Time.

(i) Effective Deposit Agreement. The Deposit Agreement shall be in full force and effect.

(j) No Objection. FINRA has confirmed that it has not raised any objection with respect to the fairness and reasonableness of the underwriting terms and arrangements relating to the offering of the Offered Securities.

(k) Lock-up Agreements. At the date of this Agreement, the Representatives shall have received an agreement substantially in the form of Exhibit A hereto signed by all of the Company’s directors and officers.

(l) Chief Financial Officer’s Certificate. On the date of this Agreement and at the Closing Time, if necessary, the Representatives shall have received from the Company a certificate of its principal financial officer with respect to certain financial data contained in the General Disclosure Package and the Prospectus.

(m) Additional Documents. At the Closing Time, counsel for the Underwriters shall have been furnished with such other documents and opinions as they may reasonably require for the purpose of enabling them to pass upon the allotment and issuance of the Offered 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 in connection with the allotment and issuance of the Offered Securities as herein contemplated shall be reasonably satisfactory in form and substance to the Representatives and counsel for the Underwriters.

(n) Termination of Agreement. If any condition specified in this Section shall not have been fulfilled when and as required to be fulfilled, this Agreement may be terminated by the Representatives by notice to the Company at any time at or prior to Closing Time, and such termination shall be without liability of any party to any other party except as provided in Section 4(b) and except that Sections 1, 4(b), 6, 7, 8, 13, 14, 15 and 16 shall survive any such termination and remain in full force and effect.

SECTION 6. INDEMNIFICATION.

(a) Indemnification of Underwriters. The Company agrees to indemnify and hold harmless each Underwriter, its affiliates (as such term is defined in Rule 501(b) under the 1933 Act (each, an “Affiliate”)), its officers and employees and each person, if any, who controls any Underwriter within the meaning of the 1933 Act or the 1934 Act as follows:

(i) 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 any information deemed to be a part thereof pursuant to Rule 430B, 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 (A) in any preliminary prospectus, any Issuer Free Writing Prospectus, the General Disclosure Package or the Prospectus (or any amendment or supplement thereto), or (B) in any materials or information provided to investors by, or on behalf of, the Company in connection with the marketing of the offering of the Offered Securities (“Marketing Materials”), including any roadshow or investor presentations made to investors by the Company (whether in person or electronically), or the omission or alleged omission in any preliminary prospectus, any Issuer Free Writing Prospectus, the General Disclosure Package, the Prospectus (or any amendment or supplement thereto) or in any Marketing Materials 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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(ii) 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 of 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) below) any such settlement is effected with the written consent of the Company;

(iii) against any and all expense whatsoever as incurred (including the reasonable fees and disbursements of counsel chosen by the Representatives) reasonably incurred and documented 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 (i) or (ii) above; and

(iv) against any Transfer Taxes, and any interest and penalties, that are payable by or on behalf of the Underwriters in connection with (i) the issuance and delivery of the Underlying Shares in the manner contemplated by this Agreement; (ii) the issuance, delivery and sale of the Offered Securities (or the ADRs evidencing such Offered Securities) to or for the account of the Underwriters in the manner contemplated by this Agreement; (iii) sale and delivery by the Underwriters of the Offered Securities (or the ADRs evidencing such Offered Securities) to the initial purchasers thereof in the manner contemplated by this Agreement; or (iv) the execution and delivery of this Agreement or the Deposit Agreement (and the Company will pay any of the foregoing Transfer Taxes, interest and penalties as provided in this clause (iv));

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 the Registration Statement (or any amendment thereto), including any information deemed to be a part thereof pursuant to Rule 430B, the General Disclosure Package or the Prospectus (or any amendment or supplement thereto) in reliance upon and in conformity with the Underwriter Information.

(b) Indemnification of Company, Directors and Officers. Each Underwriter severally agrees to indemnify and hold harmless the Company, its directors, each of its officers who signed the Registration Statement, and each person, if any, who controls the Company within the meaning of the 1933 Act or the 1934 Act, against any and all loss, liability, claim, damage and expense described in the indemnity contained in subsection (a) of this Section, 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 any information deemed to be a part thereof pursuant to Rule 430B, the General Disclosure Package or the Prospectus (or any amendment or supplement thereto) in reliance upon and in conformity with the Underwriter Information.

(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) above, counsel to the indemnified parties shall be selected by the Representatives, and, in the case of parties indemnified pursuant to Section 6(b) above, counsel to the indemnified parties shall be selected by the Company. 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 indemnifying parties be liable for the 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

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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 reasonable 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)(ii) 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.

SECTION 7. 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, on the one hand, and the Underwriters, on the other hand, from the offering of the Offered Securities pursuant to this 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, on the one hand, and of 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, on the one hand, and the Underwriters, on the other hand, in connection with the offering of the Offered Securities pursuant to this Agreement shall be deemed to be in the same respective proportions as the total net proceeds from the offering of the Offered Securities pursuant to this Agreement (before deducting expenses) received by the Company, on the one hand, and the total underwriting discount received by the Underwriters, on the other hand, in each case as set forth on the cover of the Prospectus, bear to the aggregate offering price of the Offered Securities as set forth on the cover of the Prospectus.

The relative fault of the Company, 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 by the Underwriters and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

The Company 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 underwriting discounts and commissions received by such Underwriter in connection with the Offered Securities underwritten by it and distributed to the public.

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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 and each Underwriter’s Affiliates and selling agents shall have the same rights to contribution as such Underwriter, and each director of the Company, each officer of the Company who signed the Registration Statement, and each person, if any, who controls the Company 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. The Underwriters’ respective obligations to contribute pursuant to this Section 7 are several in proportion to the number of Offered Securities set forth opposite their respective names in Schedule A hereto and not joint.

SECTION 8. REPRESENTATIONS, WARRANTIES AND AGREEMENTS TO SURVIVE. All representations, warranties and agreements contained in this Agreement or in certificates of officers of the Company or any of its Subsidiaries submitted pursuant hereto, shall remain operative and in full force and effect regardless of (i) any investigation made by or on behalf of any Underwriter or its Affiliates or selling agents, any person controlling any Underwriter, its officers or directors or any person controlling the Company and (ii) delivery of and payment for the Offered Securities.

SECTION 9. TERMINATION OF AGREEMENT.

(a) Termination. The Representatives may terminate this Agreement, by written notice to the Company, at any time at or prior to the Closing Time (i) if there has been, in the reasonable judgment of the Representatives, since the time of execution of this Agreement or since the respective dates as of which information is given in the Registration Statement, the General Disclosure Package or the Prospectus, any material adverse change in the condition, financial or otherwise, or in the earnings, business affairs or business prospects of the Company and its Subsidiaries considered as one enterprise, whether or not arising in the ordinary course of business, or (ii) if there has occurred any material adverse change in the financial markets in the United States, the United Kingdom or the international financial markets, 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 the effect of which is such as to make it, in the reasonable judgment of the Representatives, impracticable or inadvisable to proceed with the completion of the offering or to enforce contracts for the sale of the Offered Securities, or (iii) if trading in any securities of the Company has been suspended or materially limited by the Commission or the Principal Market, or (iv) if trading generally on the Principal 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 any of said exchanges or markets or by order of the Commission, FINRA or any other governmental authority, or (v) a material disruption has occurred in commercial banking or securities settlement or clearance services in the United States, in the United Kingdom or with respect to Clearstream or Euroclear systems in Europe, or (vi) if a banking moratorium has been declared by either Federal or New York authorities or authorities in the United Kingdom.

(b) Liabilities. If this Agreement is terminated pursuant to this Section, such termination shall be without liability of any party to any other party except as provided in Section 4 hereof, and provided further that Sections 1, 4(b), 6, 7, 8, 14, 15 and 16 shall survive such termination and remain in full force and effect.

SECTION 10. DEFAULT BY ONE OR MORE OF THE UNDERWRITERS. This section will apply only if more than one Underwriter is listed in Schedule A hereto. In such case, if one or more of the Underwriters shall fail at the Closing Time to subscribe for the Offered Securities which it or for which they are obligated to subscribe under this Agreement (the “Defaulted Securities”), the Representatives 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 subscribe for 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 Representatives shall not have completed such arrangements within such 24-hour period, then:

(i) if the number of Defaulted Securities does not exceed 10% of the number of Securities to be purchased on such date, each of 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 hereunder bear to the underwriting obligations of all non-defaulting Underwriters, or

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(ii) if the number of Defaulted Securities exceeds 10% of the number of Offered Securities to be purchased on such date, this Agreement shall terminate without liability on the part of any non-defaulting Underwriter.

No action taken pursuant to this Section shall relieve any defaulting Underwriter from liability in respect of its default.

In the event of any such default which does not result in a termination of this Agreement, either the (i) Representatives or (ii) the Company shall have the right to postpone Closing Time for a period not exceeding seven days in order to effect any required changes in the Registration Statement, the General Disclosure Package or the Prospectus or in any other documents or arrangements. As used herein, the term “Underwriter” includes any person substituted for an Underwriter under this Section 10.

SECTION 11. 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 Jefferies LLC at 520 Madison Avenue, New York, NY 10022, attention of General Counsel, Leerink Partners LLC at 1301 Avenue of the Americas, 12th Floor, New York, NY 10019, attention of Stuart R. Nayman, and Cantor Fitzgerald & Co. at 110 East 59th Street New York, NY 10022, attention General Counsel, with a copy (which shall not constitute notice) to Cooley LLP, 51 Hudson Yards, New York, New York 10001, attention of Eric Blanchard and Daniel Goldberg. Notices to the Company shall be directed to Mereo BioPharma Group plc at One Cavendish Place, 4th Floor, London W1G 0QF United Kingdom, attention of Charles Sermon, with a copy (which shall not constitute notice) to Mayer Brown LLP at 1221 Avenue of the Americas, New York, New York 10020, attention of David Bakst.

SECTION 12. NO ADVISORY OR FIDUCIARY RELATIONSHIP. The Company acknowledges and agrees that (a) the purchase and sale of the Offered Securities pursuant to this Agreement, including the determination of the offering price of the Offered Securities and any related discounts and commissions, is an arm’s-length commercial transaction between the Company, on the one hand, and the several Underwriters, on the other hand, (b) in connection with the offering of the Offered Securities and the process leading thereto, each Underwriter is and has been acting solely as a principal and is not the agent or fiduciary of the Company, any of its Subsidiaries or their respective stockholders, creditors, employees or any other party, (c) no Underwriter has assumed or will assume an advisory or fiduciary responsibility in favor of the Company with respect to the offering of the Offered Securities or the process leading thereto (irrespective of whether such Underwriter has advised or is currently advising the Company or any of its Subsidiaries on other matters) and no Underwriter has any obligation to the Company with respect to the offering of the Offered Securities except the obligations expressly set forth in this Agreement, (d) the Underwriters and their respective affiliates may be engaged in a broad range of transactions that involve interests that differ from those of the Company and (e) the Underwriters have not provided any legal, accounting, regulatory or tax advice with respect to the offering of the Offered Securities and the Company has consulted its own respective legal, accounting, regulatory and tax advisors to the extent it deemed appropriate.

SECTION 13. 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.

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(b) In the event that any Underwriter that is a Covered Entity and becomes subject to, 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.

(c) For purposes of this Section 13, (i) “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); (ii) “Covered Entity” means any of the following: (A) a “covered entity” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 252.82(b); (B) a “covered bank” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 47.3(b); or (C) a “covered FSI” as that term is defined in, and interpreted in accordance with, 12 C.F.R. § 382.2(b); (iii) “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; and (iv) “U.S. Special Resolution Regime” means each of (A) the Federal Deposit Insurance Act and the regulations promulgated thereunder and (B) Title II of the Dodd-Frank Wall Street Reform and Consumer Protection Act and the regulations promulgated thereunder.

SECTION 14. PARTIES. This Agreement shall each inure to the benefit of and be binding upon the Underwriters and the Company and their respective successors. Nothing expressed or mentioned in this Agreement is intended or shall be construed to give any person, firm or corporation, other than the Underwriters and the Company and their respective successors and the controlling persons and officers and directors referred to in Sections 6 and 7 and their heirs and legal representatives, any legal or equitable right, remedy or claim under or in respect of this Agreement or any provision herein contained. This Agreement and all conditions and provisions hereof are intended to be for the sole and exclusive benefit of the Underwriters and the Company 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 Securities from any Underwriter shall be deemed to be a successor by reason merely of such purchase.

SECTION 15. WAIVER OF TRIAL BY JURY. The Company (on its behalf and, to the extent permitted by applicable law, on behalf of its affiliates) and each of the Underwriters hereby irrevocably waives, to the fullest extent permitted by applicable law, any and all right to trial by jury in any legal proceeding arising out of or relating to this Agreement or the transactions contemplated hereby.

SECTION 16. GOVERNING LAW. THIS AGREEMENT AND ANY CLAIM, CONTROVERSY OR DISPUTE ARISING UNDER OR RELATED TO THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF, THE STATE OF NEW YORK WITHOUT REGARD TO ITS CHOICE OF LAW PROVISIONS.

SECTION 17. CONSENT TO JURISDICTION; WAIVER OF IMMUNITY. Any legal suit, action or proceeding arising out of or based upon this Agreement or the transactions contemplated hereby (“Related Proceedings”) shall be instituted in (i) the federal courts of the United States of America located in the City and County of New York, Borough of Manhattan or (ii) the courts of the State of New York located in the City and County of New York, Borough of Manhattan (collectively, the “Specified Courts”), and each party irrevocably submits to the exclusive jurisdiction (except for proceedings instituted in regard to the enforcement of a judgment of any such court (a “Related Judgment”), as to which such jurisdiction is non-exclusive) of such courts in any such suit, action or proceeding. Service of any process, summons, notice or document by mail to such party’s address set forth above shall be effective service of process for any suit, action or other proceeding brought in any such court. The parties irrevocably and unconditionally waive any objection to the laying of venue of any suit, action or other proceeding in the Specified Courts and irrevocably and unconditionally waive and agree not to plead or claim in any such court that any such suit, action or other proceeding brought in any such court has been brought in an inconvenient forum. The Company irrevocably appoints Mereo US Holdings Inc. as its agent to receive service of process or other legal summons for purposes of any such suit, action or proceeding that may be instituted in any state or federal court in the City and County of New York. With respect to any Related Proceeding, each party irrevocably waives, to

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the fullest extent permitted by applicable law, all immunity (whether on the basis of sovereignty or otherwise) from jurisdiction, service of process, attachment (both before and after judgment) and execution to which it might otherwise be entitled in the Specified Courts, and with respect to any Related Judgment, each party waives any such immunity in the Specified Courts or any other court of competent jurisdiction, and will not raise or claim or cause to be pleaded any such immunity at or in respect of any such Related Proceeding or Related Judgment, including, without limitation, any immunity pursuant to the United States Foreign Sovereign Immunities Act of 1976, as amended.

SECTION 18. JUDGMENT CURRENCY. The obligations of the Company pursuant to this Agreement in respect of any sum due to any Underwriter shall, notwithstanding any judgment in a currency other than U.S. dollars, not be discharged until the first business day following receipt by such Underwriter of any sum adjudged to be so due in such other currency on which (and only to the extent that) such Underwriter may in accordance with normal banking procedures purchase U.S. dollars with such other currency. If the U.S. dollars so purchased are less than the sum originally due to such Underwriter hereunder, the Company agrees, as a separate obligation and notwithstanding any such judgment, to indemnify such Underwriter against such loss. If the U.S. dollars so purchased are greater than the sum originally due to such Underwriter hereunder, such Underwriter agrees to pay to the Company an amount equal to the excess of the dollars so purchased over the sum originally due to such Underwriter hereunder.

SECTION 19. TIME. TIME SHALL BE OF THE ESSENCE OF THIS AGREEMENT. EXCEPT AS OTHERWISE SET FORTH HEREIN, SPECIFIED TIMES OF DAY REFER TO NEW YORK CITY TIME.

SECTION 20. PARTIAL UNENFORCEABILITY. The invalidity or unenforceability of any Section, paragraph or provision of this Agreement shall not affect the validity or enforceability of any other Section, paragraph or provision hereof. If any Section, paragraph or provision of this Agreement is for any reason determined to be invalid or unenforceable, there shall be deemed to be made such minor changes (and only such minor changes) as are necessary to make it valid and enforceable.

SECTION 21. COUNTERPARTS. This Agreement may be executed in any number of counterparts (which may include counterparts delivered by any standard form of telecommunication), each of which shall be deemed to be an original, but all such counterparts shall together constitute one and the same 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.

SECTION 22. EFFECT OF HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof.

SECTION 23. ENTIRE AGREEMENT. This Agreement supersedes all prior agreements and understandings (whether written or oral) between the Company and the Underwriters, or any of them, with respect to the subject matter hereof.

[SIGNATURE PAGES FOLLOW]

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If the foregoing is in accordance with your understanding of our agreement, please sign and return to the Company a counterpart hereof, whereupon this instrument, along with all counterparts, will become a binding agreement among the Underwriters and the Company in accordance with its terms.

CONFIRMED AND ACCEPTED

As of the date first above written:

JEFFERIES LLC

LEERINK PARTNERS LLC

CANTOR FITZGERALD & CO

For themselves and on behalf of

the several Underwriters listed in

Schedule A hereto.

JEFFERIES LLC

LEERINK PARTNERS LLC

CANTOR FITZGERALD & CO.

[SIGNATURE PAGE TO UNDERWRITING AGREEMENT]

SCHEDULE A

The offering price per ADS shall be $3.99.

The subscription price per ADS to be paid by the several Underwriters shall be $3.7506.

SCHEDULE B-1

PRICING TERMS

SCHEDULE B-2

FREE WRITING PROSPECTUSES

None

FORM OF LOCK-UP AGREEMENT

June 13, 2024

Jefferies LLC

Leerink Partners LLC

Cantor Fitzgerald & Co.

as Representatives of the several Underwriters (as defined below)

c/o Jefferies LLC

520 Madison Avenue

New York, New York 10022

c/o Leerink Partners LLC

1301 Avenue of the Americas, 12th Floor

New York, New York 10019

c/o Cantor Fitzgerald & Co.

110 East 59th Street

New York, New York 10022

Re: Proposed Public Offering by Mereo BioPharma Group plc

Ladies and Gentlemen:

The undersigned, in its capacity as a securityholder, officer and/or director of Mereo BioPharma Group plc, a public limited company incorporated under the laws of England and Wales with registered number 09481161 (the “Company”), understands that the Company proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) with Jefferies LLC (“Jefferies”), Leerink Partners LLC (“Leerink Partners”) and Cantor Fitzgerald & Co. (“Cantor” and together with Jefferies and Leerink Partners, the “Representatives”), providing for the public offering (the “Public Offering”) of ordinary shares of the Company, nominal value £0.003 each (“Ordinary Shares”), to be delivered in the form of American Depositary Shares (“ADSs”), each representing five Ordinary Shares. The ADSs to be offered in the Public Offering are referred to herein as the “Securities.”

The “Lock-Up Period” as used herein refers to the period beginning on the date hereof and ending on the date that is 90 days from the date of the Prospectus (as such term is defined in the Underwriting Agreement).

In recognition of the benefit that the Public Offering will confer upon the undersigned as a securityholder, an officer and/or a director of the Company, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned agrees with each underwriter to be named in the Underwriting Agreement (collectively, the “Underwriters”) that, during the Lock-Up Period, the undersigned will not, without the prior written consent of the Representatives, on behalf of the Underwriters, directly or indirectly, (i) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant for the sale of, or otherwise dispose of or transfer any ADSs or Ordinary Shares or any securities convertible into or exchangeable or exercisable for ADSs or Ordinary Shares, in each case whether now owned or hereafter acquired by the undersigned or with respect to which the undersigned has or hereafter acquires the power of disposition (collectively, the “Lock-Up Securities”), or exercise any right with respect to the registration of any of the Lock-Up Securities, or file or cause to be filed any registration statement in connection therewith, under the U.S. Securities Act of 1933, as amended, (ii) enter into any swap or any other agreement or any transaction that transfers, in whole or in part, directly or indirectly, the economic consequence of ownership of the Lock-Up Securities, whether any such swap or transaction is to be settled by delivery of ADSs, Ordinary Shares or other securities, in cash or otherwise or (iii) publicly announce any intention to do any of the foregoing.

Notwithstanding the foregoing, and subject to the conditions below, the undersigned may transfer Lock-Up Securities without the prior written consent of the Representatives, provided that (1) except with respect to a transfer described in any of clauses (iii), (v), and (vii), the Representatives receive a signed lock-up agreement for the balance of the Lock-Up Period from each donee, trustee, distributee, or transferee, as the case may be, with respect to the Lock-Up Securities that have been transferred, (2) any such transfer shall not involve a disposition for value (3) the undersigned does not voluntarily effect any public filing or report regarding such transfers prior to the expiration of the Lock-Up Period and with respect to a transfer described in any of clauses (iii) and (v), no public disclosure or filing under the Exchange Act of 1934, as amended (the “Exchange Act”) by any party to the transfer (donor, donee, transferor or transferee) shall be required reporting a reduction in beneficial ownership of Lock-Up Securities in connection with such transfer:

Furthermore, no provision in this Agreement shall be deemed to restrict or prohibit (1) the transfer of the undersigned’s Lock-Up Securities to the Company in connection with the termination of the undersigned’s services to the Company, provided that no filing by any party under the Exchange Act or other public announcement shall be required or shall be made voluntarily in connection with such transfer prior to the expiration of the Lock-Up Period; (2) the award to, and the receipt, exercise or exchange by, the undersigned of any option or warrant to acquire any ADSs or Ordinary Shares or options to purchase ADSs or Ordinary Shares, provided that any exercise or exchange is done for cash or on a “cashless” or “net exercise” basis, pursuant to any share option, share bonus or other share plan or arrangement; provided, however, that the underlying ADSs or Ordinary Shares shall be subject to the restrictions on transfer set forth in this Agreement; (3) the transfer of Lock-Up Securities pursuant to a bona fide third-party tender offer for 100% of the Company’s outstanding share capital or a merger, consolidation or other similar transaction made to all holders of the Company’s Ordinary Shares involving a Change of Control (as defined below) of the Company, including, without limitation, the entering into any lock-up, voting or similar agreement or irrevocable undertaking pursuant to which the undersigned may agree to transfer, sell, tender or otherwise dispose of Lock-Up Securities in connection with such transaction, or vote any Lock-Up Securities in favor of any such transaction; provided, however, that in the event that such tender offer, merger, consolidation or other such transaction is not completed, Lock-Up Securities held by the undersigned that have not been transferred in accordance with the above provisions shall remain subject to the restrictions on transfer set forth in this Agreement during the Lock-Up Period; and (4) the conversion into Ordinary Shares of a convertible security of the Company outstanding on the date hereof, provided that any such Ordinary Shares received upon such conversion shall be subject to the

restrictions on transfer set forth in this Agreement. For purposes of this Agreement, “Change of Control” shall mean the transfer (whether by tender offer, merger, consolidation or other similar transaction), in one transactions or a series of related transactions, to a person or group of affiliated persons (other than an Underwriter pursuant to the Public Offering), of the Company’s voting securities if, after such transfer, such person or group of affiliated persons would hold greater than 50% of the outstanding voting securities of the Company (or the surviving entity), provided that, for the avoidance of doubt, the Public Offering shall not constitute a Change of Control.

Notwithstanding anything herein to the contrary, nothing herein shall prevent the undersigned from establishing a 10b5-1 trading plan that complies with Rule 10b5-1 under the Exchange Act (“10b5-1 Trading Plan”) or from amending an existing 10b5-1 Trading Plan so long as there are no sales of Lock-Up Securities under any such 10b5-1 Trading Plan during the Lock-Up Period; and provided that, the establishment of a 10b5-1 Trading Plan or the amendment of a 10b5-1 Trading Plan during the Lock-Up Period, in either case, providing for sales of Ordinary Shares or ADSs, shall only be permitted to the extent a public announcement or filing under the Exchange Act (or its foreign equivalent), if any, is required from or voluntarily made by or on behalf of the undersigned or the Company regarding the establishment of such plan, such announcement or filing shall include a statement to the effect that no transfer of Ordinary Shares or ADSs may be made under such plan during the Lock-Up Period.

The undersigned also agrees and consents to the entry of stop transfer instructions with the Company’s transfer agent and registrar against the transfer of the Lock-Up Securities except in compliance with the foregoing restrictions.

The undersigned confirms that the undersigned has not, and has no knowledge that any immediate family has, directly or indirectly, taken any action designed to or that might reasonably be expected to cause or result in the stabilization or manipulation of the price of any security of the Company to facilitate the sale of the Securities. The undersigned will not, and will cause any immediate family not to take, directly or indirectly, any such action.

The undersigned acknowledges and agrees that the underwriters have not provided any recommendation or investment advice nor have the underwriters solicited any action from the undersigned with respect to the Public Offering and the undersigned has consulted their own legal, accounting, financial, regulatory and tax advisors to the extent deemed appropriate. The undersigned further acknowledges and agrees that, although the Underwriters may provide certain Regulation Best Interest and Form CRS disclosures or other related documentation to the undersigned in connection with the Public Offering, the Underwriters are not making a recommendation to the undersigned to participate in the Public Offering or sell any Shares at the price determined in the Public Offering, and nothing set forth in such disclosures or documentation is intended to suggest that any Underwriter is making such a recommendation.

Whether or not the Public Offering occurs as currently contemplated or at all depends on market conditions and other factors. The Public Offering will only be made pursuant to the Underwriting Agreement, the terms of which are subject to negotiation between the Company and the underwriters.

This Agreement shall automatically terminate, and the undersigned shall be released from the undersigned’s obligations hereunder, upon the earliest to occur, if any, of (i) prior to the execution of the Underwriting Agreement, the Company advises the Representatives in writing that it has determined not to proceed with the Public Offering; (ii) the Company files an application to withdraw the registration statement related to the Public Offering; (iii) the Underwriting Agreement is executed but is terminated prior to the closing of the Public Offering (other than the provisions thereof which survive termination), or (iv) June 28, 2024, in the event that the Underwriting Agreement has not been executed by such date.

This Agreement may be delivered via facsimile, electronic mail (including pdf or any electronic signature complying with the U.S. federal ESIGN Act of 2000, e.g., www.docusign.com or www.echosign.com) or other transmission method and any copy so delivered shall be deemed to have been duly and validly delivered and be valid and effective for all purposes.

This Agreement shall be governed by, and construed in accordance with, the laws of the State of New York without regard to the conflict of laws principles thereof.

[SIGNATURE PAGE FOLLOWS]

[Signature Page To Lock-Up Agreement]

Exhibit 5.1

Mereo BioPharma Group plc

4^th Floor

One Cavendish Place

London W1G 0QF

United Kingdom

We have acted as English legal advisers to the Company, a public limited company incorporated in England and Wales, in connection with an offering of 12,531,000 American Depositary Shares (the “ADSs”) each representing five (5) ordinary shares of £0.003 each in the capital of the Company (“Ordinary Shares”) (the “Offering”).

In connection with the preparation and filing of a registration statement on Form S-3 to which this opinion letter is attached as an exhibit (such registration statement, as amended, including the documents incorporated by reference therein, the “Registration Statement”) with the United States Securities and Exchange Commission (the “SEC”) pursuant to the United States Securities Act of 1933, as amended (the “Securities Act”), we have been asked to provide an opinion on certain matters, as set out below. We have taken instructions in this regard solely from the Company.

In this letter:

For the purpose of issuing this letter, we have examined such matters of fact and questions of law as we have considered appropriate. We have reviewed only the following documents and conducted only the following enquiries and searches:

Latham & Watkins is the business name of Latham & Watkins (London) LLP, a registered limited liability partnership organised under the laws of New York and authorised and regulated by the Solicitors Regulation Authority (SRA No. 203820). A list of the names of the partners of Latham & Watkins (London) LLP is open to inspection at its principal place of business, 99 Bishopsgate, London EC2M 3XF, and such persons are either solicitors, registered foreign lawyers, or managers authorised by the SRA. We are affiliated with the firm Latham & Watkins LLP, a limited liability partnership organised under the laws of Delaware.

(together, the “2023 Shareholder Resolutions”);

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This letter, the opinion given in it, and any non-contractual obligations arising out of or in connection with this letter and/or the opinion given in it, are governed by, and shall be construed in accordance with, English law, and relate only to English law as applied by the English courts as at today’s date. In particular:

The opinion given in this letter is given on the basis of each of the assumptions set out in Schedule 1 (Assumptions) and is subject to each of the reservations set out in Schedule 2 (Reservations) to this letter. The opinion given in this letter is strictly limited to the matters stated in paragraph 2 (Opinion) below and does not extend, and should not be read as extending, by implication or otherwise, to any other matters.

Subject to paragraph 1 (Introduction) and the other matters set out in this letter and its Schedules, and subject further to the following:

it is our opinion that the Ordinary Shares were duly and validly authorised and issued, fully paid or credited as fully paid (subject to the receipt of valid consideration by the Company for the issue thereof), and are not subject to any call for payment of further capital.

We express no opinion as to any agreement, instrument or other document other than as specified in this letter or as to any liability to tax which may arise or be suffered as a result of or in connection with the Offering.

This letter only applies to those facts and circumstances which exist as at today’s date and we assume no obligation or responsibility to update or supplement this letter to reflect any facts or circumstances which may subsequently come to our attention, any changes in laws which may occur after today, or to inform the addressee of any change in circumstances happening after the date of this letter which would alter our opinion.

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This letter is addressed to you solely for your benefit in connection with the Registration Statement. We consent to the filing of this letter as an exhibit to the Registration Statement. In giving such 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 or the rules and regulations thereunder.

This letter may not be relied upon by you for any other purpose, and, other than as set out in this paragraph 4, may not be furnished to, or assigned to or relied upon by, any other person, firm or entity for any purpose (including, without limitation, by any person, firm or other entity that acquires Ordinary Shares from the Company), without our prior written consent, which may be granted or withheld in our discretion.

Sincerely

/s/LATHAM & WATKINS

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SCHEDULE 1

ASSUMPTIONS

The opinion in this letter has been given on the basis of the following assumptions:

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the Company or all or any of its assets (or any analogous proceedings in any jurisdiction) and the Company is not unable to pay its debts as they fall due within the meaning of section 123 of the Insolvency Act 1986 and will not become unable to pay its debts within the meaning of that section as a result of any of the transactions contemplated herein, is not insolvent and has not been dissolved or declared bankrupt (although the Searches gave no indication that any winding-up, dissolution, moratorium or administration order, application or filing or appointment of a liquidator, receiver, administrator, administrative receiver, monitor or similar officer has been made with respect to the Company) and such actions and steps had not been taken as at the Allotment Date.

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SCHEDULE 2

RESERVATIONS

The opinion in this letter is subject to the following reservations:

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Exhibit 99.1

Mereo BioPharma Announces Pricing of $50 Million Underwritten Registered Direct Offering of American Depository Shares, Priced At-the-Market

London, June 14, 2024 - Mereo BioPharma Group plc (NASDAQ: MREO) (“Mereo” or the “Company”), a clinical-stage biopharmaceutical company focused on rare diseases, today announced the pricing of an underwritten offering of 12,531,300 of its American Depositary Shares (“ADSs”). Each ADS is being sold at a price of $3.99 per ADS in an underwritten registered direct offering priced at-the-market under Nasdaq rules. The gross proceeds from the offering, before deducting underwriting discounts and commissions and offering expenses, are expected to be approximately $50.0 million. Each ADS represents five ordinary shares of Mereo. The net proceeds of this offering are expected to be used to fund the setrusumab program, including supply and pre-launch activities in Europe, and for working capital and other general corporate purposes. The offering is expected to close on or about June 17, 2024, subject to the satisfaction of customary closing conditions.

Participants in the offering include new investors Frazier Life Sciences, Deerfield Management, and Perceptive Advisors, and existing Mereo shareholders, including Rubric Capital Management, Rock Springs Capital, and Janus Henderson Investors along with other leading healthcare-focused institutional investors.

Jefferies, Leerink Partners and Cantor are acting as joint book-running managers for the offering.

A shelf registration statement on Form S-3 (File No. 333-279433) relating to the offering of the ADSs described above was declared effective by the Securities and Exchange Commission (“SEC”) on May 22, 2024. The offering is being made only by means of a prospectus supplement and the accompanying prospectus that form a part of the registration statement. A final prospectus supplement relating to and describing the terms of the offering will be filed with the SEC and will be available on the SEC’s website at www.sec.gov. When available, copies of the final prospectus supplement and accompanying prospectus relating to these securities may also be obtained by sending a request to: Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, New York, NY 10022, by telephone at (877) 821-7388, or by email at prospectus_department@jefferies.com; Leerink Partners LLC, Attention: Syndicate Department, 53 State Street, 40th Floor, Boston, MA 02109, by telephone at (800) 808-7525, ext. 6105 or by email at syndicate@leerink.com; or Cantor Fitzgerald & Co., Attention: Capital Markets, 110 East 59^th Street, 6th Floor, New York, New York 10022, or by email at prospectus@cantor.com.

This press release does not constitute an offer to sell or a solicitation of an offer to buy any of these securities, nor will there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale is not permitted.

About Mereo BioPharma

Mereo BioPharma is a biopharmaceutical company focused on the development of innovative therapeutics for rare diseases. The Company has two rare disease product candidates, setrusumab for the treatment of osteogenesis imperfecta (OI) and alvelestat primarily for the

treatment of severe alpha-1 antitrypsin deficiency-associated lung disease (AATD-LD). The Company’s partner, Ultragenyx Pharmaceutical, Inc., has completed enrollment in the Phase 3 portion of a pivotal Phase 2/3 pediatric study in young adults (5 to 25 years old) for setrusumab in OI and in the Phase 3 study in pediatric patients (2 to <7 years old) in the first half of 2024. The partnership with Ultragenyx includes potential additional milestone payments of up to $245 million and royalties to Mereo on commercial sales in Ultragenyx territories. Mereo has retained EU and UK commercial rights and will pay Ultragenyx royalties on commercial sales in those territories. Setrusumab has received orphan designation for osteogenesis imperfecta from the EMA and FDA, PRIME designation from the EMA and has pediatric disease designation from the FDA. Alvelestat has received U.S. Orphan Drug Designation for the treatment of AATD and Fast Track designation from the FDA. Following results from ASTRAEUS and ATALANTa in AATD-lung disease, the Company has aligned with the FDA and the EMA on the primary endpoints for a Phase 3 pivotal study which if successful could enable full approval in both the U.S. and Europe.

Forward-Looking Statements

This press release contains “forward-looking statements” that involve substantial risks and uncertainties. All statements other than statements of historical fact contained herein are forward-looking statements within the meaning of Section 27A of the United States Securities Act of 1933, as amended, and Section 21E of the United States Securities Exchange Act of 1934, as amended. Forward-looking statements usually relate to future events and anticipated revenues, earnings, cash flows or other aspects of our operations or operating results. Forward-looking statements are often identified by the words “believe,” “expect,” “anticipate,” “plan,” “intend,” “foresee,” “should,” “would,” “could,” “may,” “estimate,” “outlook” and similar expressions, including the negative thereof. The absence of these words, however, does not mean that the statements are not forward-looking. These forward-looking statements are based on the Company’s current expectations, beliefs and assumptions concerning future developments and business conditions and their potential effect on the Company. While management believes that these forward-looking statements are reasonable as and when made, there can be no assurance that future developments affecting the Company will be those that it anticipates.

All of the Company’s forward-looking statements involve known and unknown risks and uncertainties some of which are significant or beyond its control and assumptions that could cause actual results to differ materially from the Company’s historical experience and its present expectations or projections. Such risks and uncertainties include, among others, the uncertainties inherent in the clinical development process; the Company’s reliance on third parties to conduct and provide funding for its clinical trials; the Company’s dependence on enrollment of patients in its clinical trials; and the Company’s dependence on its key executives. You should carefully consider the foregoing factors and the other risks and uncertainties that affect the Company’s business, including those described in the “Risk Factors” section of its Annual Report on Form 10-K, as well as discussions of potential risks, uncertainties, and other important factors in the Company’s subsequent filings with the Securities and Exchange Commission. The Company wishes to caution you not to place undue reliance on any forward-

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looking statements, which speak only as of the date hereof. The Company undertakes no obligation to publicly update or revise any of our forward-looking statements after the date they are made, whether as a result of new information, future events or otherwise, except to the extent required by law.

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