PTC Therapeutics, Inc. short interest in 2026

In 2026, PTC Therapeutics, Inc.'s disclosed short interest ran from 12.82% of shares outstanding on 15 Jan 2026 to 11.67% on 15 Sep 2026, a change of -1.15 percentage points. The year's high was 21.57% on 30 Jun 2026 and its low 10.65% on 15 Apr 2026, averaging 12.81% across 17 twice-monthly settlement dates. FINRA's days-to-cover figure peaked at 12.13 days on 31 Aug 2026. Full history: PTC Therapeutics, Inc..

Cite this page

Plain

Short position data for PTC Therapeutics, Inc. short interest in 2026: FINRA, compiled by howshorted.com, settlement date 15 Sep 2026. https://howshorted.com/us/company/ptct/2026/

Wikipedia

<ref>{{cite web |title=PTC Therapeutics, Inc. short interest in 2026 short position data |url=https://howshorted.com/us/company/ptct/2026/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2026-09-15 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-ptc-therapeutics-inc-short-interest-in-2-2026-09-15,
  title        = {PTC Therapeutics, Inc. short interest in 2026 short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/ptct/2026/}},
  note         = {Data: FINRA, settlement date 15 Sep 2026; accessed 2026-10-13},
  year         = {2026}
}

By year: 2018 · 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

2026 in figures

Start of year: 12.82% (15 Jan 2026)
End of year: 11.67% (15 Sep 2026)
Change: -1.15 pp
High: 21.57% (30 Jun 2026)
Low: 10.65% (15 Apr 2026)
Average: 12.81%
Highest days to cover: 12.13 (31 Aug 2026)
SEC filings marked: 7

Every report in 2026

PTC Therapeutics, Inc. short interest in 2026
Settlement	Short interest	Days to cover	Filings since previous
15 Jan 2026	12.82%	6.24	results (8-K)
30 Jan 2026	12.56%	9.35
13 Feb 2026	11.95%	8.99
27 Feb 2026	11.98%	8.13	10-K filed, results (8-K)
13 Mar 2026	11.02%	6.96
31 Mar 2026	11.77%	8.41
15 Apr 2026	10.65%	10.61
30 Apr 2026	12.15%	7.44
15 May 2026	12.76%	5.99	10-Q filed, results (8-K)
29 May 2026	13.29%	11.08
15 Jun 2026	14.68%	7.82
30 Jun 2026	21.57%	5.36
15 Jul 2026	12.25%	4.75
31 Jul 2026	12.66%	7.52	10-Q filed, results (8-K)
14 Aug 2026	12.25%	10.82
31 Aug 2026	11.78%	12.13
15 Sep 2026	11.67%	11.03

About this data

US short interest data: FINRA (finra.org), shown as reported shares short divided by SEC-reported shares outstanding for each settlement date. FINRA® is a registered trademark of the Financial Industry Regulatory Authority, Inc. This site is not affiliated with or endorsed by FINRA or the SEC; displayed for personal reference, bulk redistribution is not permitted (see terms). Nothing here is investment advice. Method: methodology.