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HowShorted

How shorted is Insmed Incorporated? INSM

#1,693most shorted US stockof 3,805 ranked stocks, more shorted than 55%

4.95%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.29
5 reports (~10 weeks)
−2.45
days to cover
5.27
Aggregate net short position time series for Insmed Incorporated

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 Insmed Incorporated 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
6 Aug 20265.20% 31 Jul 20264.99% 14 Aug 2026−0.21
7 May 20266.82% 30 Apr 20268.12% 15 May 2026+1.30
19 Feb 20265.33% 13 Feb 20265.23% 27 Feb 2026−0.10
30 Oct 20254.49% 15 Oct 20253.77% 31 Oct 2025−0.72
7 Aug 20255.24% 31 Jul 20254.97% 15 Aug 2025−0.27
8 May 20258.72% 30 Apr 20259.04% 15 May 2025+0.32
20 Feb 20257.99% 14 Feb 20258.07% 28 Feb 2025+0.08
31 Oct 20247.97% 15 Oct 20246.76% 15 Nov 2024−1.21

Fails to deliver

The SEC's fails-to-deliver figure for INSM: 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
152
3 Sep 2026
Highest in window
139,933
20 Apr 2026
Days with a balance
64
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Insmed Incorporated 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 140K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20264.95%−0.29
31 Aug 20265.24%+0.25
14 Aug 20264.99%−0.21
31 Jul 20265.20%−0.16
15 Jul 20265.36%−2.04
30 Jun 20267.40%−1.20
15 Jun 20268.60%−0.23
29 May 20268.83%+0.71
15 May 20268.12%+1.30
30 Apr 20266.82%+0.39
15 Apr 20266.43%+0.05
31 Mar 20266.38%+1.72
13 Mar 20264.66%−0.57
27 Feb 20265.23%−0.10
13 Feb 20265.33%−0.16
30 Jan 20265.49%−0.08
15 Jan 20265.57%+0.40
31 Dec 20255.17%+0.98
15 Dec 20254.19%−0.44
28 Nov 20254.63%+0.44
14 Nov 20254.19%+0.42
31 Oct 20253.77%−0.72
15 Oct 20254.49%−0.59
30 Sep 20255.08%+0.08
15 Sep 20255.00%0.00
29 Aug 20255.00%+0.03
15 Aug 20254.97%−0.27
31 Jul 20255.24%−0.08
15 Jul 20255.32%−0.06
30 Jun 20255.38%−1.02
13 Jun 20256.40%−3.19
30 May 20259.59%+0.55
15 May 20259.04%+0.32
30 Apr 20258.72%+0.37
15 Apr 20258.35%+0.34
31 Mar 20258.01%+0.02
14 Mar 20257.99%−0.08
28 Feb 20258.07%+0.08
14 Feb 20257.99%−0.14
31 Jan 20258.13%−0.30
15 Jan 20258.43%−0.20
31 Dec 20248.63%+1.36
13 Dec 20247.27%+0.22
29 Nov 20247.05%+0.29
15 Nov 20246.76%−0.98
31 Oct 20247.74%−0.23
15 Oct 20247.97%+0.29
30 Sep 20247.68%+0.57
13 Sep 20247.11%−0.01
30 Aug 20247.12%−0.74
15 Aug 20247.86%−1.36
31 Jul 20249.22%−0.79
15 Jul 202410.01%+1.38
28 Jun 20248.63%+0.85
14 Jun 20247.78%+0.47
31 May 20247.31%+0.63
15 May 20246.68%+0.72
30 Apr 20245.96%−0.61
15 Apr 20246.57%+0.25
28 Mar 20246.32%+0.14
15 Mar 20246.18%+0.19
29 Feb 20245.99%−0.46
15 Feb 20246.45%−0.82
31 Jan 20247.27%+0.62
12 Jan 20246.65%−0.57
29 Dec 20237.22%−1.26
15 Dec 20238.48%0.00
30 Nov 20238.48%−1.42
15 Nov 20239.90%−0.90
31 Oct 202310.80%+1.33
13 Oct 20239.47%+0.57
29 Sep 20238.90%−0.61
15 Sep 20239.51%+0.86
31 Aug 20238.65%+0.92
15 Aug 20237.73%+0.64
31 Jul 20237.09%+0.02
14 Jul 20237.07%+0.50
30 Jun 20236.57%−0.31
15 Jun 20236.88%+0.27
31 May 20236.61%−0.18
15 May 20236.79%+0.06
28 Apr 20236.73%−0.59
14 Apr 20237.32%−0.53
31 Mar 20237.85%−0.30
15 Mar 20238.15%+0.46
28 Feb 20237.69%−0.20
15 Feb 20237.89%−0.54
31 Jan 20238.43%+0.48
13 Jan 20237.95%+0.06
30 Dec 20227.89%+1.09
15 Dec 20226.80%+0.98
30 Nov 20225.82%+0.33
15 Nov 20225.49%−0.24
31 Oct 20225.73%−1.48
14 Oct 20227.21%+0.03
30 Sep 20227.18%+0.48
15 Sep 20226.70%+1.24
31 Aug 20225.46%−0.18
15 Aug 20225.64%−0.38
29 Jul 20226.02%−1.56
15 Jul 20227.58%−1.60
30 Jun 20229.18%−0.39
15 Jun 20229.57%+0.44
31 May 20229.13%−0.08
13 May 20229.21%−0.29
29 Apr 20229.50%+0.08
14 Apr 20229.42%+0.86
31 Mar 20228.56%+0.11
15 Mar 20228.45%−0.18
28 Feb 20228.63%+0.25
15 Feb 20228.38%+0.65
31 Jan 20227.73%+1.77
14 Jan 20225.96%−0.02
31 Dec 20215.98%−0.28
15 Dec 20216.26%+0.22
30 Nov 20216.04%−0.02
15 Nov 20216.06%−0.24
29 Oct 20216.30%−1.67
15 Oct 20217.97%+0.31
30 Sep 20217.66%+0.12
15 Sep 20217.54%−1.42
31 Aug 20218.96%+0.59
13 Aug 20218.37%−0.46
30 Jul 20218.83%+1.00
15 Jul 20217.83%−0.12
30 Jun 20217.95%+0.06
15 Jun 20217.89%+0.42
28 May 20217.47%−0.47
14 May 20217.94%+0.40
30 Apr 20217.54%−1.04
15 Apr 20218.58%−0.05
31 Mar 20218.63%+0.21
15 Mar 20218.42%+0.53
26 Feb 20217.89%+0.02
12 Feb 20217.87%−0.42
29 Jan 20218.29%−0.62
15 Jan 20218.91%−0.09
31 Dec 20209.00%−0.41
15 Dec 20209.41%−0.78
30 Nov 202010.19%−1.10
13 Nov 202011.29%+0.62
30 Oct 202010.67%−0.89
15 Oct 202011.56%+0.44
30 Sep 202011.12%−0.31
15 Sep 202011.43%−0.02
31 Aug 202011.45%−0.79
14 Aug 202012.24%−2.40
31 Jul 202014.64%−0.57
15 Jul 202015.21%−0.42
30 Jun 202015.63%+0.46
15 Jun 202015.17%+0.10
29 May 202015.07%+0.38
15 May 202014.69%−1.01
30 Apr 202015.70%+0.62
15 Apr 202015.08%+1.64
31 Mar 202013.44%+1.16
13 Mar 202012.28%−0.50
28 Feb 202012.78%−0.25
14 Feb 202013.03%−0.12
31 Jan 202013.15%−1.33
15 Jan 202014.48%−1.36
31 Dec 201915.84%−1.55
13 Dec 201917.39%−1.13
29 Nov 201918.52%+0.67
15 Nov 201917.85%−0.42
31 Oct 201918.27%−0.82
15 Oct 201919.09%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2019.

Frequently asked questions

How shorted is Insmed Incorporated right now?
4.95% of Insmed Incorporated's (INSM) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,693rd 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 INSM'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 INSM's days to cover?
5.27 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.