James G. McArthur - 01 Mar 2026 Form 4 Insider Report for PepGen Inc. (PEPG)

Role: President and CEO, Director
Signature: /s/ Noel Donnelly, as attorney-in-fact
Issuer symbol: PEPG
Transactions as of: 01 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 02 Mar 2026, 16:59:31 UTC
Previous filing: 18 Dec 2025
Next filing: 06 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
McArthur James G	President and CEO, Director	321 HARRISON AVE., 8TH FLOOR, C/O PEPGEN INC., BOSTON	/s/ Noel Donnelly, as attorney-in-fact	02 Mar 2026	0001763307

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PEPG	Common Stock	Award	$0	+187,688	+165%	$0.000000	301,601	01 Mar 2026	Direct	F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	PEPG	Stock Option (Right to Buy)	Award	$0	+731,250		$0.000000	731,250	01 Mar 2026	Common Stock	731,250	$6.22	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Consists of 187,688 restricted stock units ("RSUs"), each representing the contingent right to receive one share of Common Stock upon vesting. The RSUs vest in equal annual installments over four years, with the first installment vesting on March 1, 2027, subject to the Reporting Person's continued service to the Issuer on each such vesting date.
F2	This option shall vest and become exercisable as follows: 25% of the shares on the one-year anniversary of the Grant Date, with the remaining 75% vesting and becoming exercisable in 36 equal monthly installments thereafter, subject to the Reporting Person's continued service to the Issuer on each such vesting date.