X0508 4 2026-02-18 0001070081 PTC THERAPEUTICS, INC. PTCT 0001808968 Klein Matthew B. C/O PTC THERAPEUTICS, INC. 500 WARREN CORPORATE CENTER DRIVE WARREN NJ 07059 true true false false CHIEF EXECUTIVE OFFICER 1 Common Stock 2026-02-18 4 S 0 7371 69.36 D 387082 D 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 17,500 RSUs from a February 15, 2025 grant of 70,000 RSUs. /s/ Avraham S. Adler, Attorney-in-Fact 2026-02-20