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HowShorted

How shorted is Penumbra, Inc.? PEN

#1,819most shorted US stockof 3,805 ranked stocks, more shorted than 52%

4.58%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.18
5 reports (~10 weeks)
−0.60
days to cover
7.18
Aggregate net short position time series for Penumbra, 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 Penumbra, 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 20265.39% 15 Jul 20264.66% 31 Jul 2026−0.73
6 May 20264.82% 30 Apr 20264.87% 15 May 2026+0.05
25 Feb 20264.75% 13 Feb 20264.76% 27 Feb 2026+0.01
15 Jan 20264.37% 31 Dec 20254.09% 30 Jan 2026−0.28
5 Nov 20254.65% 31 Oct 20254.31% 14 Nov 2025−0.34
29 Jul 20254.69% 15 Jul 20253.89% 31 Jul 2025−0.80
23 Apr 20254.06% 15 Apr 20253.98% 30 Apr 2025−0.08
18 Feb 20254.36% 14 Feb 20253.52% 28 Feb 2025−0.84

Fails to deliver

The SEC's fails-to-deliver figure for PEN: 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
1
10 Sep 2026
Highest in window
89,305
16 Jan 2026
Days with a balance
74
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Penumbra, 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 89K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20264.58%+0.18
31 Aug 20264.40%−0.22
14 Aug 20264.62%−0.04
31 Jul 20264.66%−0.73
15 Jul 20265.39%+0.21
30 Jun 20265.18%+0.13
15 Jun 20265.05%+0.18
29 May 20264.87%0.00
15 May 20264.87%+0.05
30 Apr 20264.82%−0.29
15 Apr 20265.11%−1.10
31 Mar 20266.21%+0.96
13 Mar 20265.25%+0.49
27 Feb 20264.76%+0.01
13 Feb 20264.75%+0.66
30 Jan 20264.09%−0.31
15 Jan 20264.40%+0.03
31 Dec 20254.37%+0.27
15 Dec 20254.10%+0.23
28 Nov 20253.87%−0.44
14 Nov 20254.31%−0.34
31 Oct 20254.65%+0.20
15 Oct 20254.45%+0.31
30 Sep 20254.14%−0.93
15 Sep 20255.07%+0.48
29 Aug 20254.59%+0.41
15 Aug 20254.18%+0.29
31 Jul 20253.89%−0.80
15 Jul 20254.69%−0.21
30 Jun 20254.90%+0.97
13 Jun 20253.93%+0.59
30 May 20253.34%−0.56
15 May 20253.90%−0.08
30 Apr 20253.98%−0.08
15 Apr 20254.06%+0.20
31 Mar 20253.86%+0.68
14 Mar 20253.18%−0.34
28 Feb 20253.52%−0.84
14 Feb 20254.36%+0.62
31 Jan 20253.74%−1.14
15 Jan 20254.88%+0.09
31 Dec 20244.79%+0.14
13 Dec 20244.65%−0.17
29 Nov 20244.82%−0.19
15 Nov 20245.01%−0.87
31 Oct 20245.88%−0.95
15 Oct 20246.83%+1.02
30 Sep 20245.81%−0.96
13 Sep 20246.77%+0.54
30 Aug 20246.23%−0.86
15 Aug 20247.09%+1.20
31 Jul 20245.89%−0.58
15 Jul 20246.47%−0.01
28 Jun 20246.48%+0.35
14 Jun 20246.13%+0.42
31 May 20245.71%+0.72
15 May 20244.99%−0.50
30 Apr 20245.49%+0.47
15 Apr 20245.02%+0.04
28 Mar 20244.98%−0.11
15 Mar 20245.09%−0.01
29 Feb 20245.10%−0.54
15 Feb 20245.64%+0.01
31 Jan 20245.63%+0.23
12 Jan 20245.40%−0.12
29 Dec 20235.52%−0.33
15 Dec 20235.85%−0.12
30 Nov 20235.97%−0.52
15 Nov 20236.49%+0.29
31 Oct 20236.20%+0.03
13 Oct 20236.17%+0.32
29 Sep 20235.85%+0.03
15 Sep 20235.82%+0.09
31 Aug 20235.73%+0.17
15 Aug 20235.56%−1.32
31 Jul 20236.88%−1.50
14 Jul 20238.38%−0.81
30 Jun 20239.19%−0.18
15 Jun 20239.37%+0.47
31 May 20238.90%−0.03
15 May 20238.93%−1.21
28 Apr 202310.14%−0.07
14 Apr 202310.21%−0.44
31 Mar 202310.65%+0.13
15 Mar 202310.52%−0.42
28 Feb 202310.94%+0.42
15 Feb 202310.52%+0.44
31 Jan 202310.08%+0.22
13 Jan 20239.86%−0.08
30 Dec 20229.94%+0.52
15 Dec 20229.42%+0.78
30 Nov 20228.64%+0.47
15 Nov 20228.17%+0.79
31 Oct 20227.38%+1.13
14 Oct 20226.25%+0.12
30 Sep 20226.13%+0.37
15 Sep 20225.76%+0.25
31 Aug 20225.51%+0.10
15 Aug 20225.41%+0.02
29 Jul 20225.39%−0.54
15 Jul 20225.93%−0.01
30 Jun 20225.94%+1.08
15 Jun 20224.86%+0.78
31 May 20224.08%+0.11
13 May 20223.97%−0.44
29 Apr 20224.41%−0.22
14 Apr 20224.63%+0.06
31 Mar 20224.57%+0.03
15 Mar 20224.54%+0.10
28 Feb 20224.44%+0.06
15 Feb 20224.38%+0.06
31 Jan 20224.32%−0.20
14 Jan 20224.52%−0.13
31 Dec 20214.65%−0.35
15 Dec 20215.00%+0.88
30 Nov 20214.12%+0.05
15 Nov 20214.07%−0.65
29 Oct 20214.72%−0.28
15 Oct 20215.00%+0.26
30 Sep 20214.74%+0.31
15 Sep 20214.43%−0.09
31 Aug 20214.52%−0.04
13 Aug 20214.56%−0.16
30 Jul 20214.72%+0.08
15 Jul 20214.64%−0.09
30 Jun 20214.73%−0.53
15 Jun 20215.26%−0.40
28 May 20215.66%−0.56
14 May 20216.22%−0.92
30 Apr 20217.14%−0.32
15 Apr 20217.46%−0.17
31 Mar 20217.63%−0.26
15 Mar 20217.89%−0.49
26 Feb 20218.38%−0.73
12 Feb 20219.11%−0.97
29 Jan 202110.08%−6.60
15 Jan 202116.68%+0.36
31 Dec 202016.32%+0.96
15 Dec 202015.36%+2.89
30 Nov 202012.47%−0.18
13 Nov 202012.65%−0.05
30 Oct 202012.70%−0.46
15 Oct 202013.16%+2.65
30 Sep 202010.51%+1.84
15 Sep 20208.67%+0.87
31 Aug 20207.80%+1.23
14 Aug 20206.57%−0.63
31 Jul 20207.20%−0.73
15 Jul 20207.93%−0.50
30 Jun 20208.43%+0.45
15 Jun 20207.98%−0.70
29 May 20208.68%+0.07
15 May 20208.61%−0.10
30 Apr 20208.71%−0.45
15 Apr 20209.16%+0.10
31 Mar 20209.06%−0.65
13 Mar 20209.71%−1.48
28 Feb 202011.19%+0.38
14 Feb 202010.81%−0.50
31 Jan 202011.31%−0.05
15 Jan 202011.36%−0.53
31 Dec 201911.89%−0.29
13 Dec 201912.18%−0.44
29 Nov 201912.62%−1.45
15 Nov 201914.07%−1.77
31 Oct 201915.84%−2.62
15 Oct 201918.46%+0.15
30 Sep 201918.31%+1.91
13 Sep 201916.40%+1.61
30 Aug 201914.79%+1.46
15 Aug 201913.33%+1.08
31 Jul 201912.25%−2.32
15 Jul 201914.57%+0.88
28 Jun 201913.69%−0.90
14 Jun 201914.59%−0.72
31 May 201915.31%−0.18
15 May 201915.49%−0.24
30 Apr 201915.73%+2.67
15 Apr 201913.06%+0.52
29 Mar 201912.54%+0.71
15 Mar 201911.83%+3.28
28 Feb 20198.55%−0.53
15 Feb 20199.08%−0.13
31 Jan 20199.21%+0.27
15 Jan 20198.94%−1.64
31 Dec 201810.58%+0.57
14 Dec 201810.01%+1.21
30 Nov 20188.80%−0.23
15 Nov 20189.03%+1.86
31 Oct 20187.17%+0.63
15 Oct 20186.54%+0.84
28 Sep 20185.70%−0.30
14 Sep 20186.00%+0.43
31 Aug 20185.57%−0.04
15 Aug 20185.61%−0.51
31 Jul 20186.12%+0.12
13 Jul 20186.00%+0.79
29 Jun 20185.21%−0.19
15 Jun 20185.40%−0.21
31 May 20185.61%−0.33
15 May 20185.94%−0.07
30 Apr 20186.01%−0.31
13 Apr 20186.32%−0.23
29 Mar 20186.55%−0.84
15 Mar 20187.39%−0.79
28 Feb 20188.18%−0.41
15 Feb 20188.59%+0.34
31 Jan 20188.25%+1.17
12 Jan 20187.08%+0.33
29 Dec 20176.75%–

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

Frequently asked questions

How shorted is Penumbra, Inc. right now?
4.58% of Penumbra, Inc.'s (PEN) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,819th 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 PEN'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 PEN's days to cover?
7.18 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.