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HowShorted

How shorted is Inspire Medical Systems, Inc.? INSP

#367most shorted US stockof 3,805 ranked stocks, more shorted than 90%

13.59%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.94
5 reports (~10 weeks)
−2.70
days to cover
4.94
Aggregate net short position time series for Inspire Medical Systems, 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 Inspire Medical Systems, 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
3 Aug 202613.56% 31 Jul 202615.13% 14 Aug 2026+1.57
4 May 202611.06% 30 Apr 202612.78% 15 May 2026+1.72
11 Feb 202613.31% 30 Jan 202613.79% 13 Feb 2026+0.48
12 Jan 202610.01% 31 Dec 202510.16% 15 Jan 2026+0.15
3 Nov 202511.37% 31 Oct 202512.63% 14 Nov 2025+1.26
4 Aug 20258.49% 31 Jul 20257.75% 15 Aug 2025−0.74
5 May 20259.72% 30 Apr 202510.86% 15 May 2025+1.14
10 Feb 20258.41% 31 Jan 20259.78% 14 Feb 2025+1.37

Fails to deliver

The SEC's fails-to-deliver figure for INSP: 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
13,400
24 Aug 2026
Highest in window
60,000
28 Apr 2026
Days with a balance
50
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Inspire Medical Systems, 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 60K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202613.59%+0.94
31 Aug 202612.65%−2.48
14 Aug 202615.13%+1.57
31 Jul 202613.56%−1.52
15 Jul 202615.08%−1.21
30 Jun 202616.29%+3.83
15 Jun 202612.46%−0.37
29 May 202612.83%+0.05
15 May 202612.78%+1.72
30 Apr 202611.06%+0.96
15 Apr 202610.10%−1.10
31 Mar 202611.20%−1.28
13 Mar 202612.48%−0.66
27 Feb 202613.14%−0.65
13 Feb 202613.79%+0.48
30 Jan 202613.31%+3.15
15 Jan 202610.16%+0.15
31 Dec 202510.01%−1.92
15 Dec 202511.93%−0.05
28 Nov 202511.98%−0.65
14 Nov 202512.63%+1.26
31 Oct 202511.37%+1.80
15 Oct 20259.57%+0.61
30 Sep 20258.96%+0.11
15 Sep 20258.85%+0.91
29 Aug 20257.94%+0.19
15 Aug 20257.75%−0.74
31 Jul 20258.49%−2.67
15 Jul 202511.16%+0.02
30 Jun 202511.14%−0.38
13 Jun 202511.52%+0.66
30 May 202510.86%0.00
15 May 202510.86%+1.14
30 Apr 20259.72%+0.77
15 Apr 20258.95%−0.90
31 Mar 20259.85%+0.08
14 Mar 20259.77%−0.81
28 Feb 202510.58%+0.80
14 Feb 20259.78%+1.37
31 Jan 20258.41%+0.79
15 Jan 20257.62%−0.29
31 Dec 20247.91%+0.17
13 Dec 20247.74%+1.08
29 Nov 20246.66%−0.82
15 Nov 20247.48%+0.96
31 Oct 20246.52%+0.11
15 Oct 20246.41%−0.29
30 Sep 20246.70%+2.64
13 Sep 20244.06%−0.31
30 Aug 20244.37%+0.10
15 Aug 20244.27%+0.24
31 Jul 20244.03%−0.83
15 Jul 20244.86%−0.58
28 Jun 20245.44%−0.58
14 Jun 20246.02%−0.56
31 May 20246.58%+0.34
15 May 20246.24%−1.53
30 Apr 20247.77%−0.05
15 Apr 20247.82%+0.79
28 Mar 20247.03%+0.72
15 Mar 20246.31%+0.40
29 Feb 20245.91%−0.06
15 Feb 20245.97%+0.66
31 Jan 20245.31%+0.68
12 Jan 20244.63%+0.36
29 Dec 20234.27%+0.49
15 Dec 20233.78%+0.31
30 Nov 20233.47%−1.00
15 Nov 20234.47%+0.42
31 Oct 20234.05%+0.05
13 Oct 20234.00%−0.29
29 Sep 20234.29%+0.27
15 Sep 20234.02%+0.50
31 Aug 20233.52%−0.09
15 Aug 20233.61%+1.05
31 Jul 20232.56%−0.37
14 Jul 20232.93%−0.15
30 Jun 20233.08%−1.43
15 Jun 20234.51%−0.02
31 May 20234.53%+0.50
15 May 20234.03%−0.27
28 Apr 20234.30%−0.48
14 Apr 20234.78%+0.43
31 Mar 20234.35%+0.90
15 Mar 20233.45%−0.08
28 Feb 20233.53%−0.68
15 Feb 20234.21%+0.45
31 Jan 20233.76%+0.18
13 Jan 20233.58%+0.37
30 Dec 20223.21%+0.14
15 Dec 20223.07%−0.83
30 Nov 20223.90%−0.33
15 Nov 20224.23%+0.04
31 Oct 20224.19%−0.73
14 Oct 20224.92%+0.38
30 Sep 20224.54%+0.42
15 Sep 20224.12%−0.74
31 Aug 20224.86%−0.36
15 Aug 20225.22%+0.12
29 Jul 20225.10%+0.07
15 Jul 20225.03%+0.01
30 Jun 20225.02%−0.17
15 Jun 20225.19%−0.14
31 May 20225.33%+0.35
13 May 20224.98%+0.30
29 Apr 20224.68%−0.20
14 Apr 20224.88%+0.31
31 Mar 20224.57%+0.40
15 Mar 20224.17%+0.05
28 Feb 20224.12%−0.08
15 Feb 20224.20%+0.02
31 Jan 20224.18%+0.73
14 Jan 20223.45%+0.37
31 Dec 20213.08%+0.30
15 Dec 20212.78%+0.77
30 Nov 20212.01%−0.29
15 Nov 20212.30%−0.58
29 Oct 20212.88%+0.05
15 Oct 20212.83%−0.16
30 Sep 20212.99%−0.30
15 Sep 20213.29%−0.54
31 Aug 20213.83%+0.58
13 Aug 20213.25%−0.81
30 Jul 20214.06%+0.89
15 Jul 20213.17%+0.17
30 Jun 20213.00%−0.01
15 Jun 20213.01%+0.38
28 May 20212.63%+0.17
14 May 20212.46%−0.06
30 Apr 20212.52%−0.13
15 Apr 20212.65%−0.01
31 Mar 20212.66%−0.33
15 Mar 20212.99%−0.05
26 Feb 20213.04%−0.03
12 Feb 20213.07%+0.17
29 Jan 20212.90%+0.12
15 Jan 20212.78%−0.13
31 Dec 20202.91%+0.11
15 Dec 20202.80%−0.17
30 Nov 20202.97%−1.24
13 Nov 20204.21%−0.90
30 Oct 20205.11%−0.63
15 Oct 20205.74%−0.76
30 Sep 20206.50%+0.96
15 Sep 20205.54%−0.17
31 Aug 20205.71%−0.90
14 Aug 20206.61%−0.48
31 Jul 20207.09%−0.58
15 Jul 20207.67%−1.05
30 Jun 20208.72%+1.72
15 Jun 20207.00%−0.35
29 May 20207.35%−0.93
15 May 20208.28%+0.78
30 Apr 20207.50%−3.10
15 Apr 202010.60%+2.15
31 Mar 20208.45%+1.38
13 Mar 20207.07%+0.94
28 Feb 20206.13%+1.45
14 Feb 20204.68%+0.16
31 Jan 20204.52%−1.59
15 Jan 20206.11%+0.99
31 Dec 20195.12%+0.42
13 Dec 20194.70%−0.13
29 Nov 20194.83%−0.69
15 Nov 20195.52%−0.50
31 Oct 20196.02%+1.00
15 Oct 20195.02%–

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

Frequently asked questions

How shorted is Inspire Medical Systems, Inc. right now?
13.59% of Inspire Medical Systems, Inc.'s (INSP) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 367th 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 INSP'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 INSP's days to cover?
4.94 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.