X0508 4 2025-03-03 0001835597 PepGen Inc. PEPG 0001922546 Donnelly Noel 321 HARRISON AVE., 8TH FLOOR C/O PEPGEN INC. BOSTON MA 02118 1 Chief Financial Officer 0 Common Stock 2025-03-03 4 A 0 23283 0 A 24956 D Stock Option (Right to Buy) 2.81 2025-03-03 4 A 0 104250 0 A 2026-03-03 2035-03-02 Common Stock 104250 104250 D Consists of shares of Common Stock issuable under 23,283 restricted stock units ("RSUs"). Each RSU represents the right to receive one share of Common Stock upon vesting. These RSUs are scheduled to vest in equal annual installments over four years with the first installment vesting on March 3, 2026, subject to the Reporting Person's continued service or employment with the Company on each applicable vesting date. Includes of 23,283 shares of unvested RSUs. This option shall vest as follows: twenty-five percent (25%) on the one-year anniversary of the Grant Date and the remainder vesting in thirty-six (36) equal monthly installments, subject to the Reporting Person's continued service or employment with the Company on each applicable vesting date. /s/ Noel Donnelly 2025-03-05