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HowShorted

How shorted is Gossamer Bio, Inc.? GOSS

16.90%
of shares outstanding reported short · settlement date 31 Aug 2026
vs previous report
−0.85
5 reports (~10 weeks)
−7.05
days to cover
2.79
Aggregate net short position time series for Gossamer Bio, 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 Gossamer Bio, 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
13 Aug 202640.47% 31 Jul 202617.75% 14 Aug 2026−22.72
27 Jul 202631.18% 15 Jul 202640.47% 31 Jul 2026+9.29
18 May 202617.40% 15 May 202626.76% 29 May 2026+9.36
17 Mar 202615.60% 13 Mar 202615.98% 31 Mar 2026+0.38
5 Nov 202510.77% 31 Oct 202510.55% 14 Nov 2025−0.22
5 Aug 20258.24% 31 Jul 20259.02% 15 Aug 2025+0.78
15 May 20254.43% 30 Apr 20254.88% 30 May 2025+0.45
13 Mar 20252.47% 28 Feb 20252.53% 14 Mar 2025+0.06

Fails to deliver

The SEC's fails-to-deliver figure for GOSS: 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.

Latest balance
6,311
14 Sep 2026
Highest in window
18,391,665
21 Jul 2026
Days with a balance
130
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Gossamer Bio, 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 18M shares.

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Sector: Healthcare · By year: 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
31 Aug 202616.90%−0.85
14 Aug 202617.75%−22.72
31 Jul 202640.47%+9.29
15 Jul 202631.18%+8.30
30 Jun 202622.88%−1.07
15 Jun 202623.95%−2.81
29 May 202626.76%+9.36
15 May 202617.40%+0.35
30 Apr 202617.05%−0.08
15 Apr 202617.13%+1.15
31 Mar 202615.98%+0.38
13 Mar 202615.60%+0.60
27 Feb 202615.00%+1.57
13 Feb 202613.43%+1.86
30 Jan 202611.57%+0.67
15 Jan 202610.90%+0.48
31 Dec 202510.42%+1.64
15 Dec 20258.78%−1.35
28 Nov 202510.13%−0.42
14 Nov 202510.55%−0.22
31 Oct 202510.77%−1.00
15 Oct 202511.77%−0.28
30 Sep 202512.05%+1.50
15 Sep 202510.55%+0.85
29 Aug 20259.70%+0.68
15 Aug 20259.02%+0.78
31 Jul 20258.24%+0.27
15 Jul 20257.97%+0.53
30 Jun 20257.44%+2.57
13 Jun 20254.87%−0.01
30 May 20254.88%+0.24
15 May 20254.64%+0.21
30 Apr 20254.43%+0.39
15 Apr 20254.04%+0.53
31 Mar 20253.51%+0.98
14 Mar 20252.53%+0.06
28 Feb 20252.47%−0.05
14 Feb 20252.52%−0.04
31 Jan 20252.56%−0.20
15 Jan 20252.76%+0.06
31 Dec 20242.70%−0.40
13 Dec 20243.10%+0.29
29 Nov 20242.81%−0.07
15 Nov 20242.88%+0.09
31 Oct 20242.79%−0.28
15 Oct 20243.07%−0.36
30 Sep 20243.43%−0.35
13 Sep 20243.78%−0.24
30 Aug 20244.02%−0.22
15 Aug 20244.24%−0.01
31 Jul 20244.25%+0.19
15 Jul 20244.06%−0.20
28 Jun 20244.26%−0.15
14 Jun 20244.41%−1.43
31 May 20245.84%+0.28
15 May 20245.56%−0.13
30 Apr 20245.69%+0.76
15 Apr 20244.93%+0.16
28 Mar 20244.77%−0.14
15 Mar 20244.91%−1.43
29 Feb 20246.34%−0.45
15 Feb 20246.79%−0.63
31 Jan 20247.42%−0.28
12 Jan 20247.70%−0.09
29 Dec 20237.79%−0.56
15 Dec 20238.35%−1.67
30 Nov 202310.02%+0.19
15 Nov 20239.83%+0.94
31 Oct 20238.89%−1.51
13 Oct 202310.40%−0.18
29 Sep 202310.58%+1.63
15 Sep 20238.95%+0.17
31 Aug 20238.78%−0.30
15 Aug 20239.08%−12.01
31 Jul 202321.09%+5.72
14 Jul 202315.37%+0.33
30 Jun 202315.04%−1.99
15 Jun 202317.03%+1.05
31 May 202315.98%−0.54
15 May 202316.52%−0.62
28 Apr 202317.14%−0.89
14 Apr 202318.03%+0.07
31 Mar 202317.96%−7.85
15 Mar 202325.81%−2.37
28 Feb 202328.18%+1.46
15 Feb 202326.72%−0.12
31 Jan 202326.84%−1.92
13 Jan 202328.76%+0.30
30 Dec 202228.46%+13.21
15 Dec 202215.25%−7.48
30 Nov 202222.73%+2.48
15 Nov 202220.25%+0.16
31 Oct 202220.09%+1.29
14 Oct 202218.80%+0.31
30 Sep 202218.49%+0.81
15 Sep 202217.68%+0.52
31 Aug 202217.16%+0.69
15 Aug 202216.47%−2.35
29 Jul 202218.82%+1.30
15 Jul 202217.52%+2.15
30 Jun 202215.37%−0.31
15 Jun 202215.68%+1.14
31 May 202214.54%−0.37
13 May 202214.91%+1.26
29 Apr 202213.65%−1.42
14 Apr 202215.07%−0.41
31 Mar 202215.48%−0.29
15 Mar 202215.77%−0.13
28 Feb 202215.90%−0.35
15 Feb 202216.25%+0.12
31 Jan 202216.13%+1.38
14 Jan 202214.75%+0.41
31 Dec 202114.34%+1.05
15 Dec 202113.29%+0.17
30 Nov 202113.12%−0.04
15 Nov 202113.16%+1.17
29 Oct 202111.99%+0.10
15 Oct 202111.89%−0.30
30 Sep 202112.19%−0.52
15 Sep 202112.71%−0.44
31 Aug 202113.15%−0.73
13 Aug 202113.88%−0.73
30 Jul 202114.61%+1.15
15 Jul 202113.46%+0.42
30 Jun 202113.04%−0.82
15 Jun 202113.86%+0.16
28 May 202113.70%−0.11
14 May 202113.81%−0.53
30 Apr 202114.34%−0.48
15 Apr 202114.82%+0.18
31 Mar 202114.64%+3.55
15 Mar 202111.09%+0.65
26 Feb 202110.44%+0.36
12 Feb 202110.08%+1.59
29 Jan 20218.49%−1.45
15 Jan 20219.94%−0.45
31 Dec 202010.39%+0.26
15 Dec 202010.13%−0.90
30 Nov 202011.03%+0.44
13 Nov 202010.59%−2.64
30 Oct 202013.23%−0.51
15 Oct 202013.74%+0.74
30 Sep 202013.00%+2.26
15 Sep 202010.74%+0.07
31 Aug 202010.67%−0.07
14 Aug 202010.74%−1.12
31 Jul 202011.86%+1.02
15 Jul 202010.84%+2.09
30 Jun 20208.75%+0.17
15 Jun 20208.58%−0.24
29 May 20208.82%+2.01
15 May 20206.81%−0.31
30 Apr 20207.12%−0.45
15 Apr 20207.57%+0.14
31 Mar 20207.43%−0.21
13 Mar 20207.64%−0.18
28 Feb 20207.82%−0.24
14 Feb 20208.06%−0.40
31 Jan 20208.46%+1.06
15 Jan 20207.40%+0.76
31 Dec 20196.64%+1.16
13 Dec 20195.48%−0.15
29 Nov 20195.63%−0.64
15 Nov 20196.27%−0.48
31 Oct 20196.75%−0.67
15 Oct 20197.42%–

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

Frequently asked questions

How shorted is Gossamer Bio, Inc. right now?
16.90% of Gossamer Bio, Inc.'s (GOSS) shares outstanding were reported short for settlement date 31 Aug 2026, per FINRA's consolidated short interest report.
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 GOSS'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 GOSS's days to cover?
2.79 days for settlement date 31 Aug 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.