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PTC Therapeutics PTCT

US equityMarket cap rank #2043
$63.65 +$0.19 (+0.30%)
Market closed · Oct 5, 8:20 pm ET · Last extended-hours $63.65 0.00%
Open$63.42
Prev close$63.46
Day range$62.60 – $64.47
Volume1.04M
Market cap$5.31B
P/E (TTM)–
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Short interest11.67% of floatDays to cover 11.0 · as of 15 Sep 2026
Short-sale volume share16.2%5-day average of daily volume

Short-sale volume as % of daily volume

12%15%18%22%Sep '26Sep '26Oct '26

Reported short interest has fallen from 20.87% to 11.67% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 9,738,919 11.7% 11.0
31 Aug 2026 9,828,154 11.8% 12.1
14 Aug 2026 10,221,046 12.2% 10.8
31 Jul 2026 10,566,249 12.7% 7.5
15 Jul 2026 9,833,980 11.9% 4.8
30 Jun 2026 17,315,032 20.9% 5.4

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