X0508 4 2026-02-19 0001070081 PTC THERAPEUTICS, INC. PTCT 0001578852 Boulding Mark Elliott C/O PTC THERAPEUTICS, INC. 500 WARREN CORPORATE CENTER DRIVE WARREN NJ 07059 false true false false EXEC. VP AND CLO 1 Common Stock 2026-02-19 4 S 0 588 68.54 D 107643 D Common Stock 2026-02-19 4 S 0 1629 69.82 D 106014 D Common Stock 2026-02-19 4 S 0 212 68.54 D 105802 D Common Stock 2026-02-19 4 S 0 590 69.82 D 105212 D This transaction was effected pursuant to a written Rule 10b5-1 plan adopted by the Reporting Person on December 4, 2024. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $67.99 to $68.93 per share. The Reporting Person hereby undertakes, upon request by the SEC staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $69.52 to $70.18 per share. The Reporting Person hereby undertakes, upon request by the SEC staff, the issuer or a security holder of the issuer, to provide full information regarding the number of shares sold at each separate price. /s/ Avraham S. Adler, Attorney-in-Fact 2026-02-23