Replimune Group, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549​

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934

(Amendment )

Filed by the Registrant ☒

Filed by a Party other than the Registrant ☐

Check the appropriate box:

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material under §240.14a-12

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REPLIMUNE GROUP, INC.

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(Name of Registrant as Specified In Its Charter)​

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)​

Payment of Filing Fee (Check the appropriate box):

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No fee required.

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Fee paid previously with preliminary materials.

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11

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Dear Stockholders:

On behalf of the Board of Directors of Replimune Group, Inc. (the “Company,” “we” or “Replimune”), I invite you to attend our 2025 Annual Meeting of Stockholders (the “Annual Meeting”), which will be held on Wednesday, September 3, 2025, at 11:30 a.m., Eastern Time. The Annual Meeting will be a completely virtual meeting of stockholders conducted via live webcast. You will be able to participate in the Annual Meeting, vote online during the Annual Meeting and submit your questions during the Annual Meeting by visitingwww.meetnow.global/MF6VJVT, but you will not be able to attend the Annual Meeting in person. A Notice of Internet Availability of Proxy Materials, which contains instructions on how to access online the proxy statement accompanying this letter (the “Proxy Statement”) and our Annual Report for the fiscal year ended March 31, 2025, is first being sent to stockholders on or about July 25, 2025. We urge you to carefully read our proxy materials, which provide important information about the Annual Meeting and will serve as your guide to the business that will be conducted at the Annual Meeting.

The matters to be voted upon at the Annual Meeting are listed in the Notice of 2025 Annual Meeting of Stockholders and are more fully described in the Proxy Statement.

All holders of record of our common stock at the close of business on July 16, 2025, the record date, are entitled to notice of and to vote at the Annual Meeting and any continuation, postponement, or adjournment thereof. Whether or not you participate in the Annual Meeting, it is important that your shares be represented and voted during the Annual Meeting. We therefore are soliciting proxies so that each stockholder has an opportunity to vote on the matters that are scheduled to come before the stockholders at the Annual Meeting. If you have previously received our Notice of Internet Availability of Proxy Materials, then instructions regarding how you can vote are contained therein. If you have received a proxy card, then instructions regarding how you can vote are contained on the proxy card. Submitting your vote via the Internet or by telephone or proxy card will not affect your right to vote electronically if you decide to virtually attend the Annual Meeting. If your shares are held in street name (held for your account by a broker or other nominee), you will receive instructions from your broker or other nominee explaining how to vote your shares. Whether or not you expect to attend the Annual Meeting virtually, we urge you to vote your shares as promptly as possible to ensure your representation and the presence of a quorum at the Annual Meeting.

Thank you for your continuing interest in the Company.

Sincerely,

/s/ SUSHIL PATEL

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Chief Executive Officer

July 25, 2025

NOTICE OF 2025 ANNUAL MEETING OF STOCKHOLDERS

The 2025 Annual Meeting of Stockholders (the “Annual Meeting”) of Replimune Group, Inc. (the “Company,” “we” or “Replimune”) will be held on Wednesday, September 3, 2025, at 11:30 a.m., Eastern Time. We have adopted a virtual format for the Annual Meeting, which will be conducted via live webcast. You will be able to attend the Annual Meeting online and submit your questions during the meeting by visitingwww.meetnow.global/MF6VJVT and entering your 15-digit control number included in your Notice of Internet Availability of Proxy Materials (the “Internet Notice”), on any proxy card you received or on the instructions that accompanied your proxy materials. The Annual Meeting will be held for the purpose of considering the following company-sponsored proposals:

to elect Philip Astley-Sparke, Kapil Dhingra, Michael Goller, Christy Oliger and Joseph Slattery as Class I members of the Company’s Board of Directors (each a “Class I director”), each to serve for a three-year term until the Company’s 2028 Annual Meeting of Stockholders and until his or her respective successor is duly elected and qualified;

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to ratify the selection of PricewaterhouseCoopers LLP as the independent registered public accounting firm for the Company for the fiscal year ending March 31, 2026;

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to approve, on a non-binding advisory basis, the compensation of the Company’s named executive officers for the fiscal year ended March 31, 2025; and

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to approve an amendment to the Company’s 2018 Omnibus Incentive Compensation Plan.

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We will also consider and act upon any other matters that properly come before the Annual Meeting or any continuation, adjournment or postponement thereof.

Our Board of Directors recommends that you vote “FOR” each of the nominees for Class I director (Proposal No. 1), “FOR” the ratification of the selection of PricewaterhouseCoopers LLP as the independent registered public accounting firm (Proposal No. 2), “FOR” the approval, on a non-binding advisory basis, of the compensation of the Company’s named executive officers for the fiscal year ended March 31, 2025 (Proposal No. 3); and “FOR” the approval of an amendment to the Company’s 2018 Omnibus Incentive Compensation Plan (Proposal No. 4).

Our Board of Directors has fixed the close of business on July 16, 2025 as the record date for determining stockholders entitled to notice of and to vote at the Annual Meeting. Therefore, each outstanding share of our common stock entitles the holder of record of such shares at the close of business on July 16, 2025 to receive notice of, and to vote at, the Annual Meeting or any continuation, adjournment or postponement thereof. A list of stockholders entitled to vote at the Annual Meeting will be available for examination during ordinary business hours for 10 days prior to the Annual Meeting at our principal executive offices at 500 Unicorn Park Drive, Suite 303, Woburn, MA 01801. This stockholder list will also be available for review online during the Annual Meeting. To participate in the Annual Meeting, including to vote via the Internet or telephone, you will need the 15-digit control number included in your Internet Notice, on any proxy card you received or on the instructions that accompanied your proxy materials.

Whether or not you expect to attend the Annual Meeting electronically, we urge you to vote your shares as promptly as possible to ensure your representation and the presence of a quorum at the Annual Meeting. If you choose to attend the Annual Meeting electronically, you may still vote your shares electronically at the Annual Meeting, even if you have previously voted or returned your proxy by any of the methods described in our proxy statement. If your shares are held in street name in a bank or brokerage account, please refer to the materials provided to you by your bank, broker or other nominee for voting instructions. Your proxy is revocable in accordance with the procedures set forth in our proxy statement.

All stockholders are extended a cordial invitation to virtually attend the Annual Meeting via live webcast.

By Order of the Board of Directors,

/s/ SUSHIL PATEL

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Chief Executive Officer

July 25, 2025