X0508 4 2026-01-08 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 2026-01-08 4 S 0 881 76.45 D 115196 D Common Stock 2026-01-08 4 S 0 59 76.45 D 6791 I By Spouse Represents shares automatically sold pursuant to an irrevocable sell to cover election to satisfy tax withholding obligations in connection with the vesting of 3,600 RSUs from a January 7, 2022 grant of 14,400 RSUs. Represents shares automatically sold pursuant to an irrevocable sell to cover election to satisfy tax withholding obligations in connection with the vesting of 195 RSUs from a January 7, 2022 grant of 780 RSUs. /s/ Avraham S. Adler, Attorney-in-Fact 2026-01-12