ALTG-A Alta Equipment Group Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 3)*

Alta Equipment Group Inc.

(Name of Issuer)

Common stock, $0.0001 par value

(Title of Class of Securities)

02128L106

(CUSIP Number)

Mill Road Capital III, L.P.

Attn: Thomas E. Lynch

328 Pemberwick Road

Greenwich, CT 06831

203-987-3500

With a copy to:

Peter M. Rosenblum, Esq.

Foley Hoag LLP

155 Seaport Blvd.

Boston, MA 02210

617-832-1000

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

January 19, 2024

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.  ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See §240.13d-7 for other parties to whom copies are sent.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

This Amendment No. 3 to the joint statement on Schedule 13D with respect to the common stock, par value $0.0001 (the “Common Stock”), of Alta Equipment Group Inc., a Delaware corporation (the “Issuer”), filed by Thomas E. Lynch, Mill Road Capital III GP LLC, a Cayman Islands limited liability company, and Mill Road Capital III, L.P., a Cayman Islands exempted limited partnership (collectively, the “Reporting Persons”) on May 19, 2023, as amended by Amendment No. 1 on Schedule 13D with respect to the Common Stock filed by the Reporting Persons on October 5, 2023, and as amended by Amendment No. 2 on Schedule 13D with respect to the Common Stock filed by the Reporting Persons on December 22, 2023 (such joint statement, as so amended and as amended herein, the “Schedule 13D”), amends the Schedule 13D as follows:

(b) The business address of Mr. Lynch, Mr. Jacobs, Mr. Petito and Mr. Yanagi, and the address of the principal business and the principal office of the Fund and the GP, is 334 Pemberwick Road, Second Floor, Greenwich, CT 06831.

2. Item 3 of the Schedule 13D shall hereby be amended and restated in full as follows:

The Reporting Persons have acquired beneficial ownership of an aggregate of 2,733,865 shares of Common Stock for $33,956,043.16 using working capital from the Fund and the proceeds of margin loans under margin loan facilities maintained in the ordinary course of business by the Fund with a broker on customary terms and conditions. The purchase price of shares acquired pursuant to the assignment of Put Options (as defined in Item 6) is not reduced by the premium received by the Reporting Persons upon sale of the Put Options.

(a, b) The percentages of beneficial ownership reported in this Item 5, and on each Reporting Person’s cover page to this Schedule 13D, are based on a total of 32,368,112 shares of Common Stock issued and outstanding as of November 6, 2023, as reported in the Issuer’s quarterly report on Form 10-Q for the fiscal quarter ended September 30, 2023. All of the share numbers reported herein are as of January 23, 2024, unless otherwise indicated. Each Reporting Person’s cover page to this Schedule 13D for is incorporated by reference into this Item 5(a, b).

The Fund directly holds, and thus has sole voting and dispositive power over, 2,733,865 shares of Common Stock. The GP, as sole general partner of the Fund, also has sole authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares on behalf of the Fund, and Mr. Lynch has shared authority to vote (or direct the vote of), and to dispose (or direct the disposal) of, these shares in his capacity as Chairman and Management Committee Director of the GP. Accordingly, each of the

Reporting Persons beneficially owns 2,733,865 shares of Common Stock, or approximately 8.4% of the outstanding shares of Common Stock, and the Reporting Persons beneficially own, in the aggregate, 2,733,865 shares of Common Stock, or approximately 8.4% of the outstanding shares of Common Stock.

(c) Except as otherwise described in this Schedule 13D, no Reporting Person, other than the Fund as set forth in the table below, effected any transaction in the Common Stock since December 22, 2023 (the date of the filing of Amendment No. 2 to the Schedule 13D):

Except as otherwise described in this Schedule 13D, the above-listed transactions were conducted in the ordinary course of business on the open market for cash, and the purchase prices do not reflect brokerage commissions paid.

In addition, since December 22, 2023, the Fund sold the Put Options described in Item 6, which is incorporated by reference into this Item 5(c).

The table below lists the standard American-style, exchange-traded put options (“Put Options”) sold by the Fund since December 22, 2023 (the date of the filing of Amendment No. 2 to the Schedule 13D) that are outstanding as of January 23, 2024. Each of the below listed transactions was conducted in the ordinary course of business on the open market for cash, and the sale prices do not reflect brokerage commissions paid.

Each Put Option gives the holder the right (but not the obligation) to sell to the Fund and require the Fund to purchase, on or before the expiration date, the number of underlying shares of Common Stock, at a purchase price per share equal to the strike price. If a Put Option is assigned (exercised) on or before its expiration date, the Fund must purchase the shares of Common Stock underlying such Put Option in exchange for the aggregate exercise price.

Except as otherwise described in this Schedule 13D, including the Exhibits attached hereto, there are no contracts, arrangements, understandings or relationships (legal or otherwise) among the Reporting Persons, or between the Reporting Persons and any third party, with respect to any securities of the Issuer, including, but not limited to, those involving the transfer or voting of securities, finder’s fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or losses, or the giving or withholding of proxies.

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Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.