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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): July 30, 2026

REPLIMUNE GROUP, INC.

(Exact name of registrant as specified in its charter)

Delaware |  | 001-38596 |  | 82-2082553
(State or other jurisdiction of incorporation) |  | (Commission File Number) |  | (IRS Employer Identification Number)

500 Unicorn Park Drive

Suite 303

Woburn, MA 01801

(Address of principal executive offices, including Zip Code)

Registrant’s telephone number, including area code: (781) 222-9600

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

| ¨ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

| ¨ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

| ¨ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

| ¨ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class |  | Trading Symbol(s) |  | Name of each exchange on which registered
Common Stock, par value $0.001 per share |  | REPL |  | The Nasdaq Stock Market LLC (Nasdaq Global Select Market)

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 7.01 | Regulation FD Disclosure.

On July 30, 2026, Replimune Group, Inc. (the “Company”) will attend a meeting with the U.S. Food and Drug Administration's (“FDA”) Cellular, Tissue, and Gene Therapies Advisory Committee to discuss the Company’s Biologics License Application (“BLA”) resubmission for RP1 (vusolimogene oderparepvec) in combination with nivolumab for the treatment of advanced melanoma. The Company has made available a copy of the presentation slides to be presented at the meeting. The presentation is furnished as Exhibit 99.1 to this Current Report on Form 8-K. The Company undertakes no obligation to update, supplement or amend the materials attached hereto.

The information contained in this Item 7.01 and in the accompanying Exhibit 99.1 shall not be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing, unless expressly incorporated by specific reference to such filing. The information in this Item 7.01 and the accompanying Exhibit 99.1 shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended.

Item 9.01 | Financial Statements and Exhibits.

Exhibit No. |  | Description
99.1 |  | Company Presentation dated July 30, 2026
104 |  | Cover page interactive data file (formatted as Inline XBRL)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| REPLIMUNE GROUP, INC.
Date: July 30, 2026 | By: | /s/ Sushil Patel
|  | Sushil Patel
|  | Chief Executive Officer