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HowShorted

How shorted was Tourmaline Bio, Inc.? TRML

Tourmaline Bio, Inc. left the US market in 2025. This page is a frozen archive of its reported short interest, ending 15 Oct 2025. The ticker TRML no longer refers to this company and may since have been reassigned.
3.15%
of shares outstanding reported short · settlement date 15 Oct 2025
vs previous report
−0.67
5 reports (~10 weeks)
−7.09
days to cover
1.81
Aggregate net short position time series for Tourmaline 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 Tourmaline 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 202510.24% 31 Jul 20259.75% 15 Aug 2025−0.49
2 May 202512.43% 30 Apr 202512.71% 15 May 2025+0.28
13 Mar 202513.35% 28 Feb 202513.28% 14 Mar 2025−0.07
7 Nov 20246.07% 31 Oct 20246.48% 15 Nov 2024+0.41
8 Aug 20248.32% 31 Jul 20248.44% 15 Aug 2024+0.12
13 May 202412.12% 30 Apr 20249.55% 15 May 2024−2.57
19 Mar 20242.59% 15 Mar 20245.78% 28 Mar 2024+3.19
24 Jan 20241.97% 12 Jan 20242.28% 31 Jan 2024+0.31
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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Oct 20253.15%−0.67
30 Sep 20253.82%−2.54
15 Sep 20256.36%−3.97
29 Aug 202510.33%+0.58
15 Aug 20259.75%−0.49
31 Jul 202510.24%−1.50
15 Jul 202511.74%+0.29
30 Jun 202511.45%+0.11
13 Jun 202511.34%−0.67
30 May 202512.01%−0.70
15 May 202512.71%+0.28
30 Apr 202512.43%+0.51
15 Apr 202511.92%−0.65
31 Mar 202512.57%−0.71
14 Mar 202513.28%−0.07
28 Feb 202513.35%+1.16
14 Feb 202512.19%+1.64
31 Jan 202510.55%+1.47
15 Jan 20259.08%+0.97
31 Dec 20248.11%+1.70
13 Dec 20246.41%+0.03
29 Nov 20246.38%−0.10
15 Nov 20246.48%+0.41
31 Oct 20246.07%+0.15
15 Oct 20245.92%−1.47
30 Sep 20247.39%−0.31
13 Sep 20247.70%−0.63
30 Aug 20248.33%−0.11
15 Aug 20248.44%+0.12
31 Jul 20248.32%+0.17
15 Jul 20248.15%+2.18
28 Jun 20245.97%−4.34
14 Jun 202410.31%−0.85
31 May 202411.16%+1.61
15 May 20249.55%−2.57
30 Apr 202412.12%+5.16
15 Apr 20246.96%+1.18
28 Mar 20245.78%+3.19
15 Mar 20242.59%−1.24
29 Feb 20243.83%+0.47
15 Feb 20243.36%+1.08
31 Jan 20242.28%+0.31
12 Jan 20241.97%+1.47
13 Oct 20230.50%−0.30
29 Sep 20230.80%−0.59
15 Sep 20231.39%+0.27
31 Aug 20231.12%+0.47
15 Aug 20230.65%−1.62
15 Jun 20232.27%+0.09
31 May 20232.18%+0.34
15 May 20231.84%−0.03
28 Apr 20231.87%−0.35
14 Apr 20232.22%+0.16
31 Mar 20232.06%+0.41
15 Mar 20231.65%−3.59
15 Feb 20235.24%+0.08
31 Jan 20235.16%+0.52
13 Jan 20234.64%+1.62
30 Dec 20223.02%+0.91
15 Dec 20222.11%+0.28
30 Nov 20221.83%+0.14
15 Nov 20221.69%+0.31
31 Oct 20221.38%+0.02
14 Oct 20221.36%+0.10
30 Sep 20221.26%−0.16
15 Sep 20221.42%+0.02
31 Aug 20221.40%−0.20
15 Aug 20221.60%−0.13
29 Jul 20221.73%−0.89
15 Jul 20222.62%+0.16
30 Jun 20222.46%−0.18
15 Jun 20222.64%−0.14
31 May 20222.78%+0.01
13 May 20222.77%+0.02
29 Apr 20222.75%+0.01
14 Apr 20222.74%−0.07
31 Mar 20222.81%−0.04
15 Mar 20222.85%+0.07
28 Feb 20222.78%−0.04
15 Feb 20222.82%+0.09
31 Jan 20222.73%−0.77
14 Jan 20223.50%+0.04
31 Dec 20213.46%+0.82
15 Dec 20212.64%+0.17
30 Nov 20212.47%+0.10
15 Nov 20212.37%+0.42
29 Oct 20211.95%−0.01
15 Oct 20211.96%−0.03
30 Sep 20211.99%+0.10
15 Sep 20211.89%−0.08
31 Aug 20211.97%+0.28
13 Aug 20211.69%+0.07
30 Jul 20211.62%−0.07
15 Jul 20211.69%–

Newest first. Scroll inside the table for earlier dates, back to 15 Jul 2021.

Frequently asked questions

How shorted was Tourmaline Bio, Inc.?
Tourmaline Bio, Inc. left the US market in 2025. Its final reported figure was 3.15% of shares outstanding for settlement date 15 Oct 2025, per FINRA's consolidated short interest report; this page preserves its full history.
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 TRML'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 TRML's days to cover?
1.81 days for settlement date 15 Oct 2025: 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.