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Form 4 reporting owner · CIK 0001288952

SCHMERTZLER MICHAEL

10% owner and Director

Mr. Schmertzler has served as a member of our Board since 2001 and as Chair of our Board since 2004. Mr. Schmertzler served as a director of our UK subsidiary until February 2016. Since 2008, he has been an Adjunct Professor and Lecturer in Economics at Yale University and, from 2018 to 2025, a Visiting Professor at Yale NUS in Singapore. Mr. Schmertzler also serves as a Charter Trustee of Phillips Academy Andover. Mr. Schmertzler currently also serves as Executive Chairman of SHY Therapeutics, a private biotechnology company; as Executive Chairman of Berryville Holdings and Dispel LLC, private cyber-technology companies; and as a Director of AgNovos, a private biotechnology company. From 2001 to 2015, Mr.…

Biography from the company’s latest DEF 14A proxy statement

30Open-market trades
2Tickers
+16.1%Avg 90d after buys
+18.6%Avg 90d after sales

PTCT price and prints

PTCTCYTK

PTC THERAPEUTICS, INC. 22 open-market prints by this insider, 6/25/2013 – 9/17/2026. Triangles mark only their Form 4 purchases and sales. Full PTCT chart

PTCT adjusted close▲ buy▼ sale
4.1925.5346.8768.2189.552026-09-17 sell SCHMERTZLER MICHAEL2026-09-16 sell SCHMERTZLER MICHAEL2026-09-10 sell SCHMERTZLER MICHAEL2026-09-09 sell SCHMERTZLER MICHAEL2026-08-27 sell SCHMERTZLER MICHAEL2026-08-26 sell SCHMERTZLER MICHAEL2026-08-20 sell SCHMERTZLER MICHAEL2026-08-19 sell SCHMERTZLER MICHAEL2024-01-08 sell SCHMERTZLER MICHAEL2023-06-07 sell SCHMERTZLER MICHAEL2020-03-16 buy SCHMERTZLER MICHAEL2019-01-25 buy SCHMERTZLER MICHAEL2014-02-19 buy SCHMERTZLER MICHAEL2013-06-25 buy SCHMERTZLER MICHAEL2013-06-202026-09-18

PTCT trades

Clear
DateForm 4TickerPositionSideSharesValue90d180d
9/17/2026Form 4PTCT
10b5-1
DirectorSELL376$25.7K+17.9%hist+24.3%hist
9/17/2026Form 4PTCT
10b5-1
DirectorSELL9,624$652.8K+17.9%hist+24.3%hist
9/16/2026Form 4PTCT
10b5-1
DirectorSELL7,006$471.9K+17.9%hist+24.3%hist
9/16/2026Form 4PTCT
10b5-1
DirectorSELL2,994$199.3K+17.9%hist+24.3%hist
9/10/2026Form 4PTCT
10b5-1
DirectorSELL10,000$673.4K+17.9%hist+24.3%hist
9/9/2026Form 4PTCT
10b5-1
DirectorSELL572$39.3K+17.9%hist+24.3%hist
9/9/2026Form 4PTCT
10b5-1
DirectorSELL9,428$639.1K+17.9%hist+24.3%hist
8/27/2026Form 4PTCT
10b5-1
DirectorSELL11,890$850.7K+17.9%hist+24.3%hist
8/27/2026Form 4PTCT
10b5-1
DirectorSELL610$44.1K+17.9%hist+24.3%hist
8/26/2026Form 4PTCT
10b5-1
DirectorSELL6,874$500.0K+17.9%hist+24.3%hist
8/26/2026Form 4PTCT
10b5-1
DirectorSELL5,626$411.7K+17.9%hist+24.3%hist
8/20/2026Form 4PTCT
10b5-1
DirectorSELL9,419$666.7K+17.9%hist+24.3%hist
8/20/2026Form 4PTCT
10b5-1
DirectorSELL2,390$171.8K+17.9%hist+24.3%hist
8/20/2026Form 4PTCT
10b5-1
DirectorSELL691$50.4K+17.9%hist+24.3%hist
8/19/2026Form 4PTCT
10b5-1
DirectorSELL5,335$388.7K+17.9%hist+24.3%hist
8/19/2026Form 4PTCT
10b5-1
DirectorSELL7,165$527.8K+17.9%hist+24.3%hist
1/8/2024Form 4PTCT
10b5-1
DirectorSELL1,500$41.7K+10.4%−5.80%
6/7/2023Form 4PTCT
10b5-1
DirectorSELL1,000$44.9K+10.7%+42.5%
3/16/2020Form 4PTCTDirectorBUY10,000$324.8K+52.1%+50.5%
1/25/2019Form 4PTCTDirectorBUY66,225$2.00M+31.8%+54.6%
2/19/2014Form 4PTCT10% owner and DirectorBUY23,000$563.5K−47.7%+18.6%
6/25/2013Form 4PTCT10% owner and DirectorBUY533,333$8.00M+28.2%+4.96%

Chart uses split-adjusted closes from the first print through the latest available bar. Returns use the last close on or before the trade date and the first close on or after 90 and 180 calendar days. Sales are signed so a declining price is a positive result for the seller. Not investment advice.