Exhibit 99.1 PTC Therapeutics Provides Corporate Update and Reports Second Quarter 2025 Financial Results – European and FDA approval of Sephience™ (sepiapterin) with broad labeling for PKU – – Global launch underway in Europe and U.S. – – Total Q2 Revenue of $179M – WARREN, N.J., August 7, 2025 – PTC Therapeutics, Inc., (NASDAQ: PTCT) today announced a corporate update and financial results for the second quarter ended June 30, 2025. "We had another strong quarter highlighted by the first approvals of Seph ...