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HowShorted

How shorted is Pulmonx Corporation? LUNG

#2,940most shorted US stockof 3,805 ranked stocks, more shorted than 22%

1.97%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.30
5 reports (~10 weeks)
−0.75
days to cover
2.51
Aggregate net short position time series for Pulmonx Corporation

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 Pulmonx Corporation 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 20262.50% 15 Jul 20262.47% 31 Jul 2026−0.03
29 Apr 20266.82% 15 Apr 20268.43% 30 Apr 2026+1.61
4 Mar 20268.04% 27 Feb 20268.00% 13 Mar 2026−0.04
12 Nov 20255.71% 31 Oct 20254.94% 14 Nov 2025−0.77
27 Oct 20253.48% 15 Oct 20255.71% 31 Oct 2025+2.23
30 Jul 20253.58% 15 Jul 20253.36% 31 Jul 2025−0.22
30 Apr 20252.94% 15 Apr 20253.87% 15 May 2025+0.93
19 Feb 20252.89% 14 Feb 20253.15% 28 Feb 2025+0.26

Fails to deliver

The SEC's fails-to-deliver figure for LUNG: 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
39,100
10 Sep 2026
Highest in window
53,992
11 Mar 2026
Days with a balance
53
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Pulmonx Corporation 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 54K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20261.97%−0.30
31 Aug 20262.27%−0.21
14 Aug 20262.48%+0.01
31 Jul 20262.47%−0.03
15 Jul 20262.50%−0.22
30 Jun 20262.72%−2.64
15 Jun 20265.36%−1.31
29 May 20266.67%+0.28
15 May 20266.39%−2.04
30 Apr 20268.43%+1.61
15 Apr 20266.82%−0.11
31 Mar 20266.93%−1.07
13 Mar 20268.00%−0.04
27 Feb 20268.04%+0.09
13 Feb 20267.95%+1.12
30 Jan 20266.83%+0.45
15 Jan 20266.38%−0.78
31 Dec 20257.16%−0.32
15 Dec 20257.48%+1.35
28 Nov 20256.13%+1.19
14 Nov 20254.94%−0.77
31 Oct 20255.71%+2.23
15 Oct 20253.48%−0.05
30 Sep 20253.53%−0.84
15 Sep 20254.37%+0.33
29 Aug 20254.04%+0.27
15 Aug 20253.77%+0.41
31 Jul 20253.36%−0.22
15 Jul 20253.58%+0.30
30 Jun 20253.28%−0.24
13 Jun 20253.52%+0.20
30 May 20253.32%−0.55
15 May 20253.87%+0.91
30 Apr 20252.96%+0.02
15 Apr 20252.94%−0.16
31 Mar 20253.10%+0.17
14 Mar 20252.93%−0.22
28 Feb 20253.15%+0.26
14 Feb 20252.89%−0.20
31 Jan 20253.09%−0.09
15 Jan 20253.18%+0.95
31 Dec 20242.23%+0.12
13 Dec 20242.11%+0.04
29 Nov 20242.07%−0.06
15 Nov 20242.13%−0.37
31 Oct 20242.50%−2.05
15 Oct 20244.55%+0.27
30 Sep 20244.28%−0.31
13 Sep 20244.59%+0.56
30 Aug 20244.03%+0.32
15 Aug 20243.71%−0.32
31 Jul 20244.03%+0.71
15 Jul 20243.32%+0.23
28 Jun 20243.09%−0.51
14 Jun 20243.60%−0.46
31 May 20244.06%+0.05
15 May 20244.01%+0.37
30 Apr 20243.64%−0.87
15 Apr 20244.51%+1.57
28 Mar 20242.94%+0.22
15 Mar 20242.72%−0.58
29 Feb 20243.30%+0.01
15 Feb 20243.29%−0.76
31 Jan 20244.05%−0.01
12 Jan 20244.06%+0.27
29 Dec 20233.79%+0.12
15 Dec 20233.67%−0.07
30 Nov 20233.74%+0.26
15 Nov 20233.48%+0.08
31 Oct 20233.40%+0.17
13 Oct 20233.23%−0.11
29 Sep 20233.34%+0.11
15 Sep 20233.23%−0.08
31 Aug 20233.31%−1.17
15 Aug 20234.48%−0.85
31 Jul 20235.33%+0.98
14 Jul 20234.35%−0.23
30 Jun 20234.58%−3.01
15 Jun 20237.59%+1.23
31 May 20236.36%−0.47
15 May 20236.83%−0.29
28 Apr 20237.12%−0.47
14 Apr 20237.59%−0.65
31 Mar 20238.24%+1.28
15 Mar 20236.96%+0.64
28 Feb 20236.32%−1.23
15 Feb 20237.55%−0.62
31 Jan 20238.17%+0.29
13 Jan 20237.88%+0.34
30 Dec 20227.54%−0.33
15 Dec 20227.87%+0.23
30 Nov 20227.64%+1.15
15 Nov 20226.49%−2.21
31 Oct 20228.70%−1.31
14 Oct 202210.01%+0.64
30 Sep 20229.37%+0.43
15 Sep 20228.94%+0.46
31 Aug 20228.48%+0.62
15 Aug 20227.86%−1.17
29 Jul 20229.03%+1.70
15 Jul 20227.33%−0.54
30 Jun 20227.87%+0.85
15 Jun 20227.02%−0.26
31 May 20227.28%−1.84
13 May 20229.12%+0.75
29 Apr 20228.37%+1.13
14 Apr 20227.24%−0.01
31 Mar 20227.25%−0.33
15 Mar 20227.58%−0.40
28 Feb 20227.98%+0.91
15 Feb 20227.07%+0.44
31 Jan 20226.63%+1.91
14 Jan 20224.72%+0.38
31 Dec 20214.34%−1.02
15 Dec 20215.36%+0.78
30 Nov 20214.58%+0.59
15 Nov 20213.99%−0.22
29 Oct 20214.21%+0.36
15 Oct 20213.85%−0.08
30 Sep 20213.93%+0.67
15 Sep 20213.26%−0.33
31 Aug 20213.59%+0.31
13 Aug 20213.28%+0.22
30 Jul 20213.06%+0.01
15 Jul 20213.05%−0.36
30 Jun 20213.41%+0.70
15 Jun 20212.71%+0.03
28 May 20212.68%−0.22
14 May 20212.90%+0.66
30 Apr 20212.24%−0.15
15 Apr 20212.39%−3.14
31 Mar 20215.53%+2.32
15 Mar 20213.21%+0.49
26 Feb 20212.72%+0.14
12 Feb 20212.58%−1.24
29 Jan 20213.82%−0.02
15 Jan 20213.84%−0.54
31 Dec 20204.38%+2.28
15 Dec 20202.10%+0.99
30 Nov 20201.11%+0.04
13 Nov 20201.07%+0.58
30 Oct 20200.49%–

Newest first. Scroll inside the table for earlier dates, back to 30 Oct 2020.

Frequently asked questions

How shorted is Pulmonx Corporation right now?
1.97% of Pulmonx Corporation's (LUNG) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,940th 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 LUNG'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 LUNG's days to cover?
2.51 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.