X0508 4 2026-01-06 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 2026-01-06 4 S 0 1279 76.95 D 117103 D Common Stock 2026-01-06 4 S 0 54 76.95 D 6902 I By Spouse Common Stock 2026-01-07 4 S 0 1026 77.48 D 116077 D Common Stock 2026-01-07 4 S 0 52 77.48 D 6850 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 January 3, 2025 grant of 19,000 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 178 RSUs from a January 3, 2025 grant of 715 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 4,250 RSUs from a January 5, 2023 grant of 17,000 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 177 RSUs from a January 5, 2023 grant of 710 RSUs. /s/ Avraham S. Adler, Attorney-in-Fact 2026-01-08