X0508 4 2026-01-08 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 2026-01-08 4 S 0 2482 76.56 D 115177 D Common Stock 2026-01-08 4 S 0 265 77.07 D 114912 D Common Stock 2026-01-08 4 S 0 1286 76.45 D 113626 D Common Stock 2026-01-09 4 S 0 1521 77.46 D 112105 D Common Stock 2026-01-09 4 S 0 686 78.71 D 111419 D Common Stock 2026-01-09 4 S 0 107 79.52 D 111312 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 $75.95 to $76.92 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 $76.99 to $77.23 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. 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. This price represents the weighted average price of sale transactions that were executed in multiple trades at prices ranging from $77.12 to $78.08 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 $78.23 to $79.21 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 $79.35 to $79.60 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 2026-01-12