PTC Therapeutics, Inc. short interest in 2021

In 2021, PTC Therapeutics, Inc.'s disclosed short interest ran from 6.16% of shares outstanding on 15 Jan 2021 to 9.70% on 31 Dec 2021, a change of +3.54 percentage points. The year's high was 9.77% on 15 Dec 2021 and its low 5.88% on 12 Feb 2021, averaging 7.32% across 24 twice-monthly settlement dates. FINRA's days-to-cover figure peaked at 17.14 days on 15 Nov 2021. Full history: PTC Therapeutics, Inc..

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Plain

Short position data for PTC Therapeutics, Inc. short interest in 2021: FINRA, compiled by howshorted.com, settlement date 31 Dec 2021. https://howshorted.com/us/company/ptct/2021/

Wikipedia

<ref>{{cite web |title=PTC Therapeutics, Inc. short interest in 2021 short position data |url=https://howshorted.com/us/company/ptct/2021/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2021-12-31 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-ptc-therapeutics-inc-short-interest-in-2-2021-12-31,
  title        = {PTC Therapeutics, Inc. short interest in 2021 short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/ptct/2021/}},
  note         = {Data: FINRA, settlement date 31 Dec 2021; accessed 2026-10-13},
  year         = {2021}
}

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2021 in figures

Start of year: 6.16% (15 Jan 2021)
End of year: 9.70% (31 Dec 2021)
Change: +3.54 pp
High: 9.77% (15 Dec 2021)
Low: 5.88% (12 Feb 2021)
Average: 7.32%
Highest days to cover: 17.14 (15 Nov 2021)
SEC filings marked: 9

Every report in 2021

PTC Therapeutics, Inc. short interest in 2021
Settlement	Short interest	Days to cover	Filings since previous
15 Jan 2021	6.16%	9.36	results (8-K)
29 Jan 2021	6.00%	9.23
12 Feb 2021	5.88%	7.99
26 Feb 2021	6.99%	10.52	10-K filed, results (8-K)
15 Mar 2021	7.49%	10.16
31 Mar 2021	7.65%	8.87
15 Apr 2021	7.70%	14.18
30 Apr 2021	7.65%	8.81
14 May 2021	7.21%	6.97	10-Q filed, results (8-K)
28 May 2021	6.75%	11.99
15 Jun 2021	6.83%	11.76
30 Jun 2021	6.85%	9.74
15 Jul 2021	7.18%	15.68
30 Jul 2021	7.54%	13.06	10-Q filed, results (8-K)
13 Aug 2021	7.40%	16.92
31 Aug 2021	6.38%	9.58
15 Sep 2021	6.32%	14.02
30 Sep 2021	6.66%	7.35
15 Oct 2021	7.17%	14.38
29 Oct 2021	7.61%	9.90	10-Q filed, results (8-K)
15 Nov 2021	8.43%	17.14
30 Nov 2021	8.37%	7.49
15 Dec 2021	9.77%	13.40
31 Dec 2021	9.70%	12.87

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.