X0609 4 2026-04-01 0 0001737953 Replimune Group, Inc. REPL 0001376491 Astley-Sparke Philip false C/O REPLIMUNE GROUP, INC. 500 UNICORN PARK DRIVE, SUITE 303 WOBURN MA 01801 1 0 0 0 0 Common Stock 2026-04-01 4 A 0 50000 0 A 1430071 D Stock Option (right to buy) 7.61 2026-04-01 4 A 0 75000 0 A 2036-04-01 Common Stock 75000 75000 D Represents shares of the Issuer's common stock issuable upon settlement of restricted stock units ("RSUs") granted to the Reporting Person. Each RSU represents a contingent right to receive one share of the Issuer's common stock. 25% of the RSUs will vest on May 15, 2027 and the remainder will vest in three approximately equal annual installments thereafter until May 15, 2030, subject to the Reporting Person's continuous service to the Issuer. 25% of the shares underlying this stock option vest on April 1, 2027, and the remainder of the shares underlying this stock option vest in 36 approximately equal monthly installments thereafter. This Form 4 is being filed late due to inadvertent administrative error. /s/ Shawn Glidden, attorney-in-fact 2026-04-07