PepGen (NASDAQ: PEPG) appoints Joseph Vittiglio as Chief Business and Legal Officer

Rhea-AI Filing Summary

PepGen Inc. reported that on December 8, 2025 it appointed Joseph Vittiglio, Esq. as its Chief Business and Legal Officer. This new executive role combines responsibility for the company's business functions with oversight of legal affairs, adding depth to its leadership team. The company also furnished a related press release as Exhibit 99.1 providing additional detail on the appointment.

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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): December 08, 2025

PepGen Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware			001-41374	85-3819886
(State or Other Jurisdiction of Incorporation)			(Commission File Number)	(IRS Employer Identification No.)
321 Harrison Avenue 8th Floor
Boston, Massachusetts				02118
(Address of Principal Executive Offices)				(Zip Code)

Registrant’s Telephone Number, Including Area Code: (781) 797-0979

(Former Name or Former Address, if Changed Since Last Report)

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 $0.0001 per share		PEPG		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 8.01 Other Events.

On December 8, 2025, PepGen Inc. (the “Company”) announced the appointment of Joseph Vittiglio, Esq., as the Company’s Chief Business and Legal Officer. A copy of the press release issued in connection with this announcement is being furnished as Exhibit 99.1 to this Current Report on Form 8-K.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits:

Exhibit Number	Description
99.1	Press release issued by PepGen Inc. on December 8, 2025
104	Cover Page Interactive Data Filed (embedded within the Inline XBRL document)

SIGNATURES

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

			PEPGEN INC.
Date:	Decemer 8, 2025	By:	/s/ Noel Donnelly
			Noel Donnelly, Chief Financial Officer

FAQ

What did PepGen Inc. (PEPG) disclose in this current report?

PepGen Inc. disclosed that it appointed Joseph Vittiglio, Esq. as its Chief Business and Legal Officer and furnished a related press release as Exhibit 99.1.

Who was appointed to a new leadership role at PepGen Inc. (PEPG)?

PepGen Inc. appointed Joseph Vittiglio, Esq. as the company's Chief Business and Legal Officer on December 8, 2025.

What is Joseph Vittiglio's new position at PepGen Inc. (PEPG)?

Joseph Vittiglio, Esq. will serve as Chief Business and Legal Officer, a role that covers both business operations and legal matters for PepGen Inc.

When did PepGen Inc. (PEPG) announce the appointment of Joseph Vittiglio?

The company announced the appointment of Joseph Vittiglio, Esq. as Chief Business and Legal Officer on December 8, 2025.

What exhibits are included with this PepGen Inc. (PEPG) filing?

The filing includes Exhibit 99.1, a press release issued by PepGen Inc. on December 8, 2025, and Exhibit 104, the cover page interactive data file embedded within the Inline XBRL document.

Where is PepGen Inc. (PEPG) listed and what is its trading symbol?

PepGen Inc.'s common stock trades on the Nasdaq Global Select Market under the trading symbol PEPG.