8-K current report · filed Sep 21, 2026

PTC THERAPEUTICS, INC. (PTCT) 8-K Current Report: September 21, 2026

Item 7.01Item 8.01Item EX-99.1PTCT overview

Short answer

PTC THERAPEUTICS, INC. (PTCT) filed an 8-K current report with the SEC on September 21, 2026 reporting Item 7.01 (Regulation FD Disclosure), Item 8.01 (Other Events), Item EX-99.1 (Exhibit EX-99.1). PTC completed acquisition of ST-920 from Sangamo, a BLA-stage one-time AAV gene therapy candidate for Fabry disease.

PTC THERAPEUTICS, INC. 8-K event analysis

AI summary of each reported item and its exhibits

Item 7.01 · Regulation FD Disclosure

  • PTC completed acquisition of ST-920 from Sangamo, a BLA-stage one-time AAV gene therapy candidate for Fabry disease
  • Asset-stage acquisition adds a potentially near-commercial rare-disease therapy to PTC’s pipeline
  • Press release furnished as Exhibit 99.1 contains transaction details and strategic implications

Item 8.01 · Other Events

  • Acquisition completed September 21, 2026, expanding PTC Therapeutics’ development portfolio
  • Rolling U.S. BLA submission for ST-920 expected in fourth quarter 2026
  • Accelerated approval application supported by 52-week Phase 1/2 STAAR renal-function and safety data
  • Planned regulatory filings outside the United States broaden ST-920’s commercial opportunity

Item EX-99.1 · Exhibit EX-99.1

  • Acquisition of ST-920 from Sangamo completed, adding a BLA-stage Fabry disease gene therapy to PTC’s rare-disease portfolio
  • Rolling FDA BLA submission targeting completion in Q4 2026, with accelerated approval potential
  • One-time AAV therapy could reduce dependence on chronic enzyme replacement therapy if durability and safety translate commercially
  • FDA designations include Orphan Drug, Fast Track and RMAT, supporting regulatory engagement but not approval
  • Key risks: BLA completion, regulatory approval, reimbursement, commercialization and potential ST-920 milestone payments

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