X0508 4 2026-02-18 0001070081 PTC THERAPEUTICS, INC. PTCT 0001578850 Almstead Neil Gregory C/O PTC THERAPEUTICS, INC. 500 WARREN CORPORATE CENTER DRIVE WARREN NJ 07059 false true false false CHIEF TECHNICAL OPS OFFICER 1 Common Stock 2026-02-18 4 S 0 3056 69.36 D 112140 D Common Stock 2026-02-18 4 S 0 65 69.36 D 6726 I By Spouse Represents shares automatically sold pursuant to an irrevocable sell to cover election entered into upon acceptance of the grant to satisfy tax withholding obligations in connection with the vesting of 4,750 RSUs from a February 15, 2024 grant of 19,000 RSUs and the vesting of 3,000 RSUs from a February 15, 2024 grant of 6,000 RSUs. Represents shares automatically sold pursuant to an irrevocable sell to cover election entered into upon acceptance of the grant to satisfy tax withholding obligations in connection with the vesting of 217 RSUs from a February 15, 2024 grant of 870 RSUs. /s/ Avraham S. Adler, Attorney-in-Fact 2026-02-20