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HowShorted

How shorted is Impinj, Inc.? PI

#681most shorted US stockof 3,805 ranked stocks, more shorted than 82%

9.92%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.97
5 reports (~10 weeks)
−1.03
days to cover
7.93
Aggregate net short position time series for Impinj, 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 Impinj, 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
29 Jul 202611.00% 15 Jul 20269.82% 31 Jul 2026−1.18
29 Apr 202610.17% 15 Apr 202610.02% 30 Apr 2026−0.15
5 Feb 20268.41% 30 Jan 20269.10% 13 Feb 2026+0.69
13 Jan 20268.78% 31 Dec 20258.72% 15 Jan 2026−0.06
29 Oct 202510.73% 15 Oct 20258.52% 31 Oct 2025−2.21
30 Jul 20259.82% 15 Jul 202511.98% 31 Jul 2025+2.16
23 Apr 202511.22% 15 Apr 202511.10% 30 Apr 2025−0.12
5 Feb 202515.74% 31 Jan 202512.55% 14 Feb 2025−3.19

Fails to deliver

The SEC's fails-to-deliver figure for PI: 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
1,278
9 Sep 2026
Highest in window
50,463
3 Jun 2026
Days with a balance
70
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Impinj, 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 50K shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20269.92%+0.97
31 Aug 20268.95%−0.72
14 Aug 20269.67%−0.15
31 Jul 20269.82%−1.18
15 Jul 202611.00%+0.05
30 Jun 202610.95%−0.27
15 Jun 202611.22%+0.54
29 May 202610.68%+1.17
15 May 20269.51%−0.51
30 Apr 202610.02%−0.15
15 Apr 202610.17%−0.05
31 Mar 202610.22%+0.29
13 Mar 20269.93%+0.08
27 Feb 20269.85%+0.75
13 Feb 20269.10%+0.69
30 Jan 20268.41%−0.31
15 Jan 20268.72%−0.06
31 Dec 20258.78%−0.61
15 Dec 20259.39%−0.49
28 Nov 20259.88%+1.33
14 Nov 20258.55%+0.03
31 Oct 20258.52%−2.21
15 Oct 202510.73%−0.02
30 Sep 202510.75%−0.57
15 Sep 202511.32%−1.96
29 Aug 202513.28%+0.13
15 Aug 202513.15%+1.17
31 Jul 202511.98%+2.16
15 Jul 20259.82%−0.24
30 Jun 202510.06%−1.95
13 Jun 202512.01%−0.63
30 May 202512.64%+0.10
15 May 202512.54%+1.44
30 Apr 202511.10%−0.12
15 Apr 202511.22%−1.49
31 Mar 202512.71%+0.10
14 Mar 202512.61%+0.28
28 Feb 202512.33%−0.22
14 Feb 202512.55%−3.19
31 Jan 202515.74%+0.78
15 Jan 202514.96%+0.14
31 Dec 202414.82%+1.45
13 Dec 202413.37%+1.63
29 Nov 202411.74%+0.37
15 Nov 202411.37%+0.28
31 Oct 202411.09%−2.70
15 Oct 202413.79%+0.19
30 Sep 202413.60%+2.66
13 Sep 202410.94%+1.18
30 Aug 20249.76%−0.27
15 Aug 202410.03%+0.55
31 Jul 20249.48%+0.14
15 Jul 20249.34%−1.33
28 Jun 202410.67%−0.23
14 Jun 202410.90%−0.36
31 May 202411.26%−0.56
15 May 202411.82%−0.87
30 Apr 202412.69%+0.78
15 Apr 202411.91%−0.35
28 Mar 202412.26%+0.26
15 Mar 202412.00%−0.01
29 Feb 202412.01%+0.06
15 Feb 202411.95%−2.10
31 Jan 202414.05%−0.03
12 Jan 202414.08%−0.05
29 Dec 202314.13%−0.85
15 Dec 202314.98%+0.14
30 Nov 202314.84%+0.39
15 Nov 202314.45%+0.37
31 Oct 202314.08%+2.38
13 Oct 202311.70%−0.19
29 Sep 202311.89%+0.50
15 Sep 202311.39%+0.95
31 Aug 202310.44%−0.18
15 Aug 202310.62%−1.23
31 Jul 202311.85%−0.46
14 Jul 202312.31%−1.22
30 Jun 202313.53%+0.63
15 Jun 202312.90%−0.99
31 May 202313.89%+2.35
15 May 202311.54%−1.45
28 Apr 202312.99%+0.52
14 Apr 202312.47%−1.22
31 Mar 202313.69%−0.08
15 Mar 202313.77%+1.45
28 Feb 202312.32%+0.70
15 Feb 202311.62%+0.44
31 Jan 202311.18%+2.12
13 Jan 20239.06%+0.30
30 Dec 20228.76%+0.68
15 Dec 20228.08%+0.78
30 Nov 20227.30%−0.74
15 Nov 20228.04%−0.35
31 Oct 20228.39%−0.20
14 Oct 20228.59%−0.03
30 Sep 20228.62%+0.63
15 Sep 20227.99%+0.54
31 Aug 20227.45%−0.61
15 Aug 20228.06%+0.08
29 Jul 20227.98%−1.27
15 Jul 20229.25%−1.80
30 Jun 202211.05%−0.17
15 Jun 202211.22%−1.84
31 May 202213.06%−0.73
13 May 202213.79%+5.72
29 Apr 20228.07%+0.32
14 Apr 20227.75%+0.54
31 Mar 20227.21%−0.35
15 Mar 20227.56%−1.20
28 Feb 20228.76%+1.42
15 Feb 20227.34%+0.33
31 Jan 20227.01%−0.29
14 Jan 20227.30%−0.10
31 Dec 20217.40%+0.33
15 Dec 20217.07%+1.76
30 Nov 20215.31%+0.14
15 Nov 20215.17%−1.43
29 Oct 20216.60%−0.38
15 Oct 20216.98%−1.31
30 Sep 20218.29%+0.10
15 Sep 20218.19%−0.29
31 Aug 20218.48%+0.13
13 Aug 20218.35%+0.13
30 Jul 20218.22%+0.12
15 Jul 20218.10%+0.15
30 Jun 20217.95%−0.57
15 Jun 20218.52%−0.64
28 May 20219.16%−1.67
14 May 202110.83%+0.80
30 Apr 202110.03%−0.72
15 Apr 202110.75%−1.42
31 Mar 202112.17%−0.31
15 Mar 202112.48%+0.20
26 Feb 202112.28%−0.03
12 Feb 202112.31%+1.88
29 Jan 202110.43%−1.19
15 Jan 202111.62%−0.38
31 Dec 202012.00%+0.58
15 Dec 202011.42%−0.92
30 Nov 202012.34%−0.09
13 Nov 202012.43%+0.39
30 Oct 202012.04%−0.59
15 Oct 202012.63%−0.18
30 Sep 202012.81%−1.09
15 Sep 202013.90%−0.47
31 Aug 202014.37%−0.17
14 Aug 202014.54%+2.50
31 Jul 202012.04%−0.29
15 Jul 202012.33%−0.11
30 Jun 202012.44%+0.27
15 Jun 202012.17%−1.18
29 May 202013.35%−0.97
15 May 202014.32%−0.05
30 Apr 202014.37%+0.21
15 Apr 202014.16%−1.12
31 Mar 202015.28%−1.49
13 Mar 202016.77%+0.91
28 Feb 202015.86%+0.67
14 Feb 202015.19%−0.70
31 Jan 202015.89%−3.32
15 Jan 202019.21%+2.62
31 Dec 201916.59%+0.99
13 Dec 201915.60%+1.67
29 Nov 201913.93%−1.15
15 Nov 201915.08%+0.38
31 Oct 201914.70%+0.06
15 Oct 201914.64%–

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

Frequently asked questions

How shorted is Impinj, Inc. right now?
9.92% of Impinj, Inc.'s (PI) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 681st 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 PI'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 PI's days to cover?
7.93 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.