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HowShorted

How shorted is PTC Therapeutics, Inc.? PTCT

#512most shorted US stockof 3,805 ranked stocks, more shorted than 86%

11.67%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.11
5 reports (~10 weeks)
−9.90
days to cover
11.03
Aggregate net short position time series for PTC Therapeutics, Inc.

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for PTC Therapeutics, Inc. days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
30 Jul 202612.25% 15 Jul 202612.66% 31 Jul 2026+0.41
7 May 202612.15% 30 Apr 202612.76% 15 May 2026+0.61
19 Feb 202611.95% 13 Feb 202611.98% 27 Feb 2026+0.03
12 Jan 202613.34% 31 Dec 202512.82% 15 Jan 2026−0.52
4 Nov 202510.50% 31 Oct 202511.73% 14 Nov 2025+1.23
7 Aug 20257.59% 31 Jul 20258.18% 15 Aug 2025+0.59
6 May 20256.49% 30 Apr 20256.52% 15 May 2025+0.03
27 Feb 20254.79% 14 Feb 20254.91% 28 Feb 2025+0.12

Fails to deliver

The SEC's fails-to-deliver figure for PTCT: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
22
11 Sep 2026
Highest in window
375,002
28 Jul 2026
Days with a balance
64
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for PTC Therapeutics, Inc. fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 375K shares.

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

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202611.67%−0.11
31 Aug 202611.78%−0.47
14 Aug 202612.25%−0.41
31 Jul 202612.66%+0.41
15 Jul 202612.25%−9.32
30 Jun 202621.57%+6.89
15 Jun 202614.68%+1.39
29 May 202613.29%+0.53
15 May 202612.76%+0.61
30 Apr 202612.15%+1.50
15 Apr 202610.65%−1.12
31 Mar 202611.77%+0.75
13 Mar 202611.02%−0.96
27 Feb 202611.98%+0.03
13 Feb 202611.95%−0.61
30 Jan 202612.56%−0.26
15 Jan 202612.82%−0.52
31 Dec 202513.34%−0.91
15 Dec 202514.25%−1.77
28 Nov 202516.02%+4.29
14 Nov 202511.73%+1.23
31 Oct 202510.50%+0.66
15 Oct 20259.84%+0.86
30 Sep 20258.98%−0.20
15 Sep 20259.18%+0.82
29 Aug 20258.36%+0.18
15 Aug 20258.18%+0.59
31 Jul 20257.59%+0.31
15 Jul 20257.28%−0.29
30 Jun 20257.57%+1.17
13 Jun 20256.40%+0.40
30 May 20256.00%−0.52
15 May 20256.52%+0.03
30 Apr 20256.49%−0.61
15 Apr 20257.10%+0.07
31 Mar 20257.03%+1.45
14 Mar 20255.58%+0.67
28 Feb 20254.91%+0.12
14 Feb 20254.79%−0.61
31 Jan 20255.40%−0.10
15 Jan 20255.50%+0.05
31 Dec 20245.45%−0.50
13 Dec 20245.95%−0.01
29 Nov 20245.96%−0.10
15 Nov 20246.06%−0.29
31 Oct 20246.35%+0.29
15 Oct 20246.06%+0.51
30 Sep 20245.55%−1.24
13 Sep 20246.79%−0.52
30 Aug 20247.31%−0.42
15 Aug 20247.73%+0.25
31 Jul 20247.48%−0.29
15 Jul 20247.77%+0.47
28 Jun 20247.30%−2.29
14 Jun 20249.59%−0.17
31 May 20249.76%−1.87
15 May 202411.63%−1.31
30 Apr 202412.94%−0.58
15 Apr 202413.52%−0.08
28 Mar 202413.60%−0.83
15 Mar 202414.43%−0.68
29 Feb 202415.11%+1.35
15 Feb 202413.76%−0.87
31 Jan 202414.63%+1.41
12 Jan 202413.22%+0.26
29 Dec 202312.96%+0.74
15 Dec 202312.22%+0.44
30 Nov 202311.78%+1.07
15 Nov 202310.71%+0.93
31 Oct 20239.78%+0.46
13 Oct 20239.32%−1.31
29 Sep 202310.63%+0.84
15 Sep 20239.79%−0.03
31 Aug 20239.82%+0.25
15 Aug 20239.57%+0.07
31 Jul 20239.50%−0.55
14 Jul 202310.05%−0.34
30 Jun 202310.39%+0.27
15 Jun 202310.12%+1.57
31 May 20238.55%+1.24
15 May 20237.31%+0.28
28 Apr 20237.03%−0.26
14 Apr 20237.29%−0.19
31 Mar 20237.48%−0.10
15 Mar 20237.58%+0.63
28 Feb 20236.95%+0.02
15 Feb 20236.93%−1.14
31 Jan 20238.07%+1.48
13 Jan 20236.59%−0.62
30 Dec 20227.21%+0.74
15 Dec 20226.47%+0.21
30 Nov 20226.26%−0.33
15 Nov 20226.59%−0.10
31 Oct 20226.69%+0.09
14 Oct 20226.60%−0.43
30 Sep 20227.03%−0.58
15 Sep 20227.61%+0.56
31 Aug 20227.05%−0.12
15 Aug 20227.17%−0.09
29 Jul 20227.26%−0.64
15 Jul 20227.90%+0.83
30 Jun 20227.07%−0.81
15 Jun 20227.88%+0.26
31 May 20227.62%+0.13
13 May 20227.49%−1.07
29 Apr 20228.56%+0.63
14 Apr 20227.93%+0.33
31 Mar 20227.60%−0.01
15 Mar 20227.61%0.00
28 Feb 20227.61%+0.22
15 Feb 20227.39%+0.40
31 Jan 20226.99%−1.95
14 Jan 20228.94%−0.76
31 Dec 20219.70%−0.07
15 Dec 20219.77%+1.40
30 Nov 20218.37%−0.06
15 Nov 20218.43%+0.82
29 Oct 20217.61%+0.44
15 Oct 20217.17%+0.51
30 Sep 20216.66%+0.34
15 Sep 20216.32%−0.06
31 Aug 20216.38%−1.02
13 Aug 20217.40%−0.14
30 Jul 20217.54%+0.36
15 Jul 20217.18%+0.33
30 Jun 20216.85%+0.02
15 Jun 20216.83%+0.08
28 May 20216.75%−0.46
14 May 20217.21%−0.44
30 Apr 20217.65%−0.05
15 Apr 20217.70%+0.05
31 Mar 20217.65%+0.16
15 Mar 20217.49%+0.50
26 Feb 20216.99%+1.11
12 Feb 20215.88%−0.12
29 Jan 20216.00%−0.16
15 Jan 20216.16%−0.76
31 Dec 20206.92%−0.28
15 Dec 20207.20%+0.37
30 Nov 20206.83%−0.04
13 Nov 20206.87%+0.26
30 Oct 20206.61%−0.77
15 Oct 20207.38%−0.26
30 Sep 20207.64%+0.31
15 Sep 20207.33%−1.09
31 Aug 20208.42%−0.86
14 Aug 20209.28%+1.11
31 Jul 20208.17%−0.53
15 Jul 20208.70%+0.35
30 Jun 20208.35%+0.58
15 Jun 20207.77%+0.77
29 May 20207.00%−0.10
15 May 20207.10%+0.69
30 Apr 20206.41%−0.64
15 Apr 20207.05%−0.25
31 Mar 20207.30%+0.75
13 Mar 20206.55%+0.48
28 Feb 20206.07%+0.43
14 Feb 20205.64%+0.04
31 Jan 20205.60%+0.17
15 Jan 20205.43%−0.23
31 Dec 20195.66%+0.51
13 Dec 20195.15%−0.21
29 Nov 20195.36%−0.76
15 Nov 20196.12%−2.91
31 Oct 20199.03%+0.12
15 Oct 20198.91%+0.41
30 Sep 20198.50%+1.65
13 Sep 20196.85%+0.21
30 Aug 20196.64%+0.02
15 Aug 20196.62%+0.14
31 Jul 20196.48%−0.38
15 Jul 20196.86%−0.41
28 Jun 20197.27%−1.29
14 Jun 20198.56%+0.09
31 May 20198.47%+0.20
15 May 20198.27%+0.49
30 Apr 20197.78%−1.22
15 Apr 20199.00%−0.65
29 Mar 20199.65%+0.42
15 Mar 20199.23%−2.13
28 Feb 201911.36%+0.78
15 Feb 201910.58%+0.05
31 Jan 201910.53%+1.71
15 Jan 20198.82%+1.18
31 Dec 20187.64%−0.02
14 Dec 20187.66%−0.77
30 Nov 20188.43%+0.21
15 Nov 20188.22%+0.14
31 Oct 20188.08%−0.61
15 Oct 20188.69%+0.74
28 Sep 20187.95%+0.44
14 Sep 20187.51%+0.20
31 Aug 20187.31%+0.36
15 Aug 20186.95%−0.45
31 Jul 20187.40%−0.32
13 Jul 20187.72%+0.15
29 Jun 20187.57%−1.49
15 Jun 20189.06%+0.44
31 May 20188.62%+0.30
15 May 20188.32%−0.98
30 Apr 20189.30%−0.89
13 Apr 201810.19%−3.02
29 Mar 201813.21%−1.55
15 Mar 201814.76%+0.07
28 Feb 201814.69%−1.07
15 Feb 201815.76%−0.42
31 Jan 201816.18%+0.41
12 Jan 201815.77%−0.09
29 Dec 201715.86%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is PTC Therapeutics, Inc. right now?
11.67% of PTC Therapeutics, Inc.'s (PTCT) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 512th most shorted US stock, out of 3,805 we rank.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this PTCT's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is PTCT's days to cover?
11.03 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.