Joseph Vittiglio - 08 Dec 2025 Form 4 Insider Report for PepGen Inc. (PEPG)

Role: Chief Business & Legal Officer
Signature: /s/ Noel Donnelly, as attorney-in-fact
Issuer symbol: PEPG
Transactions as of: 08 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 10 Dec 2025, 17:08:57 UTC
Previous filing: 03 Jun 2025
Next filing: 02 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Vittiglio Joseph	Chief Business & Legal Officer	C/O PEPGEN INC., 321 HARRISON AVE, 8TH FLOOR, BOSTON	/s/ Noel Donnelly, as attorney-in-fact	10 Dec 2025	0001551776

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PEPG	Common Stock	Award	$0	+35,000		$0.000000	35,000	08 Dec 2025	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	+160,000		$0.000000	160,000	08 Dec 2025	Common Stock	160,000	$5.59	Direct	F2

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

Explanation of Responses:

Id	Content
F1	Consists of shares of Common Stock issuable under 35,000 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 December 8, 2026, subject to the Reporting Person's continued service or employment with the Company on each applicable vesting date.
F2	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.

Content

Consists of shares of Common Stock issuable under 35,000 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 December 8, 2026, subject to the Reporting Person's continued service or employment with the Company on each applicable vesting date.

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.