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HowShorted

How shorted is SELLAS Life Sciences Group, Inc.? SLS

#24most shorted US stockof 3,805 ranked stocks, more shorted than 99%

29.25%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.57
5 reports (~10 weeks)
−6.00
days to cover
8.60
Aggregate net short position time series for SELLAS Life Sciences Group, 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 SELLAS Life Sciences Group, 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
11 Aug 202630.61% 31 Jul 202627.91% 14 Aug 2026−2.70
27 Jul 202630.78% 15 Jul 202630.61% 31 Jul 2026−0.17
12 May 202631.82% 30 Apr 202631.78% 15 May 2026−0.04
19 Mar 202632.15% 13 Mar 202629.81% 31 Mar 2026−2.34
8 Jan 202634.70% 31 Dec 202529.52% 15 Jan 2026−5.18
12 Nov 202527.51% 31 Oct 202522.32% 14 Nov 2025−5.19
12 Aug 202529.07% 31 Jul 202527.69% 15 Aug 2025−1.38
13 May 20258.49% 30 Apr 20259.64% 15 May 2025+1.15

Fails to deliver

The SEC's fails-to-deliver figure for SLS: 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
990
14 Sep 2026
Highest in window
6,232,314
2 Jan 2026
Days with a balance
203
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for SELLAS Life Sciences Group, 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 6.2M shares.

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

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202629.25%+0.57
31 Aug 202628.68%+0.77
14 Aug 202627.91%−2.70
31 Jul 202630.61%−0.17
15 Jul 202630.78%−4.47
30 Jun 202635.25%−0.03
15 Jun 202635.28%+1.31
29 May 202633.97%+2.19
15 May 202631.78%−0.04
30 Apr 202631.82%+0.28
15 Apr 202631.54%+1.73
31 Mar 202629.81%−2.34
13 Mar 202632.15%−2.34
27 Feb 202634.49%+2.16
13 Feb 202632.33%+3.31
30 Jan 202629.02%−0.50
15 Jan 202629.52%−5.18
31 Dec 202534.70%+6.29
15 Dec 202528.41%+5.06
28 Nov 202523.35%+1.03
14 Nov 202522.32%−5.19
31 Oct 202527.51%+3.68
15 Oct 202523.83%+1.94
30 Sep 202521.89%+2.05
15 Sep 202519.84%−8.03
29 Aug 202527.87%+0.18
15 Aug 202527.69%−1.38
31 Jul 202529.07%−1.46
15 Jul 202530.53%+3.72
30 Jun 202526.81%+6.01
13 Jun 202520.80%+7.35
30 May 202513.45%+3.81
15 May 20259.64%+1.15
30 Apr 20258.49%−0.07
15 Apr 20258.56%−0.44
31 Mar 20259.00%−2.15
14 Mar 202511.15%+0.06
28 Feb 202511.09%−1.20
14 Feb 202512.29%−1.64
31 Jan 202513.93%+1.14
15 Jan 202512.79%+1.46
31 Dec 202411.33%+0.74
13 Dec 202410.59%−2.27
29 Nov 202412.86%+0.41
15 Nov 202412.45%−0.94
31 Oct 202413.39%+3.93
15 Oct 20249.46%−3.25
30 Sep 202412.71%+0.02
13 Sep 202412.69%−0.08
30 Aug 202412.77%+0.77
15 Aug 202412.00%−6.93
31 Jul 202418.93%+1.65
15 Jul 202417.28%+1.53
28 Jun 202415.75%+2.33
14 Jun 202413.42%−0.17
31 May 202413.59%+0.70
15 May 202412.89%+0.46
30 Apr 202412.43%+2.36
15 Apr 202410.07%+0.70
28 Mar 20249.37%−6.79
15 Mar 202416.16%+2.08
29 Feb 202414.08%+1.96
15 Feb 202412.12%+2.40
31 Jan 20249.72%−2.39
12 Jan 202412.11%−2.64
29 Dec 202314.75%+0.23
15 Dec 202314.52%+0.14
30 Nov 202314.38%+0.09
15 Nov 202314.29%+3.53
31 Oct 202310.76%+3.57
13 Oct 20237.19%+3.36
29 Sep 20233.83%+0.23
15 Sep 20233.60%−0.38
31 Aug 20233.98%−0.02
15 Aug 20234.00%−0.17
31 Jul 20234.17%+0.11
14 Jul 20234.06%−0.04
30 Jun 20234.10%+0.15
15 Jun 20233.95%−0.26
31 May 20234.21%−0.22
15 May 20234.43%+0.18
28 Apr 20234.25%+0.09
14 Apr 20234.16%+0.28
31 Mar 20233.88%−0.42
15 Mar 20234.30%−1.95
28 Feb 20236.25%+0.44
15 Feb 20235.81%+0.12
31 Jan 20235.69%−0.15
13 Jan 20235.84%−0.17
30 Dec 20226.01%+0.05
15 Dec 20225.96%+0.06
30 Nov 20225.90%+0.29
15 Nov 20225.61%+0.76
31 Oct 20224.85%+0.85
14 Oct 20224.00%−0.04
30 Sep 20224.04%−0.02
15 Sep 20224.06%0.00
31 Aug 20224.06%−0.26
15 Aug 20224.32%−0.95
29 Jul 20225.27%−0.13
15 Jul 20225.40%−0.23
30 Jun 20225.63%−0.01
15 Jun 20225.64%+0.31
31 May 20225.33%−0.60
13 May 20225.93%+0.47
29 Apr 20225.46%−0.30
14 Apr 20225.76%−0.55
31 Mar 20226.31%+0.01
15 Mar 20226.30%+0.08
28 Feb 20226.22%−0.07
15 Feb 20226.29%+0.08
31 Jan 20226.21%+0.83
14 Jan 20225.38%+0.49
31 Dec 20214.89%−0.12
15 Dec 20215.01%+0.44
30 Nov 20214.57%+0.48
15 Nov 20214.09%−0.15
29 Oct 20214.24%−1.20
15 Oct 20215.44%+0.22
30 Sep 20215.22%+0.35
15 Sep 20214.87%−0.81
31 Aug 20215.68%−1.73
13 Aug 20217.41%−0.39
30 Jul 20217.80%+0.29
15 Jul 20217.51%+1.70
30 Jun 20215.81%+1.24
15 Jun 20214.57%−0.56
28 May 20215.13%−0.91
14 May 20216.04%+0.07
30 Apr 20215.97%−0.26
15 Apr 20216.23%+1.04
31 Mar 20215.19%−3.82
15 Mar 20219.01%+0.50
26 Feb 20218.51%−1.64
12 Feb 202110.15%+0.50
29 Jan 20219.65%+2.93
15 Jan 20216.72%−1.23
31 Dec 20207.95%−5.36
15 Dec 202013.31%+7.46
30 Nov 20205.85%+1.98
13 Nov 20203.87%−0.49
30 Oct 20204.36%0.00
15 Oct 20204.36%−0.07
30 Sep 20204.43%+1.28
15 Sep 20203.15%+1.58
31 Aug 20201.57%+0.17
14 Aug 20201.40%−1.54
31 Jul 20202.94%−0.15
15 Jul 20203.09%+0.61
30 Jun 20202.48%−0.33
15 Jun 20202.81%−0.59
29 May 20203.40%−0.51
15 May 20203.91%+0.65
30 Apr 20203.26%−0.15
15 Apr 20203.41%−0.91
31 Mar 20204.32%−1.09
13 Mar 20205.41%+4.85
31 Oct 20190.56%−0.81
15 Oct 20191.37%−5.91
29 Dec 20177.28%–

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

Frequently asked questions

How shorted is SELLAS Life Sciences Group, Inc. right now?
29.25% of SELLAS Life Sciences Group, Inc.'s (SLS) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 24th 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 SLS'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 SLS's days to cover?
8.60 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.