Commitments and Contingencies	3 Months Ended
Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	7. Commitments and Contingencies Legal proceedings From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of its business activities. The Company accrues a liability for such matters when it is probable that future expenditures will be made and that such expenditures can be reasonably estimated. On June 9, 2025, a putative shareholder class action captioned Johnny Karam v. PepGen Inc., et al. was filed in the United States District Court for the Eastern District of New York, naming the Company and its Chief Executive Officer and Chief Financial Officer as defendants. On November 18, 2025, the parties filed a stipulation of voluntary dismissal of the action. Separately, by a letter received by the Company on September 29, 2025, a putative shareholder of the Company made a purported shareholder demand based on substantially the same allegations as those set forth in the above-mentioned putative class action suit. On December 1, 2025, the demanding shareholder withdrew the demand. The Company is not party to any other litigation and does not have contingency reserves established for any litigation liabilities. Other The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to the agreements, the Company agrees to indemnify, hold harmless, and to reimburse the indemnified party for losses suffered or incurred by the indemnified party, including in connection with any U.S. patent or any copyright or other intellectual property infringement claim by any third-party with respect to the Company’s products. Further, the Company indemnifies its directors and officers who are, or were, serving at the Company’s request in such capacities. The Company’s maximum exposure under these arrangements is unknown as of December 31, 2025. The Company does not anticipate recognizing any significant losses relating to these arrangements. The term of these indemnification agreements is generally perpetual any time after execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements may be unlimited. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

7. Commitments and Contingencies

Legal proceedings

From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of its business activities. The Company accrues a liability for such matters when it is probable that future expenditures will be made and that such expenditures can be reasonably estimated.

On June 9, 2025, a putative shareholder class action captioned Johnny Karam v. PepGen Inc., et al. was filed in the United States District Court for the Eastern District of New York, naming the Company and its Chief Executive Officer and Chief Financial Officer as defendants. On November 18, 2025, the parties filed a stipulation of voluntary dismissal of the action. Separately, by a letter received by the Company on September 29, 2025, a putative shareholder of the Company made a purported shareholder demand based on substantially the same allegations as those set forth in the above-mentioned putative class action suit. On December 1, 2025, the demanding shareholder withdrew the demand.

The Company is not party to any other litigation and does not have contingency reserves established for any litigation liabilities.

Other

The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to the agreements, the Company agrees to indemnify, hold harmless, and to reimburse the indemnified party for losses suffered or incurred by the indemnified party, including in connection with any U.S. patent or any copyright or other intellectual property infringement claim by any third-party with respect to the Company’s products. Further, the Company indemnifies its directors and officers who are, or were, serving at the Company’s request in such capacities. The Company’s maximum exposure under these arrangements is unknown as of December 31, 2025. The Company does not anticipate recognizing any significant losses relating to these arrangements. The term of these indemnification agreements is generally perpetual any time after execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements may be unlimited. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements.