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HowShorted

How shorted is ASSEMBLY BIOSCIENCES, INC.? ASMB

#641most shorted US stockof 3,805 ranked stocks, more shorted than 83%

10.29%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.12
5 reports (~10 weeks)
−4.89
days to cover
6.26
Aggregate net short position time series for ASSEMBLY BIOSCIENCES, 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 ASSEMBLY BIOSCIENCES, 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
7 May 20269.82% 30 Apr 20269.73% 15 May 2026−0.09
19 Mar 20269.59% 13 Mar 20269.66% 31 Mar 2026+0.07
10 Nov 202516.81% 31 Oct 20258.26% 14 Nov 2025−8.55
6 Aug 20250.39% 31 Jul 20256.92% 15 Aug 2025+6.53
8 May 20250.18% 30 Apr 20250.35% 15 May 2025+0.17
20 Mar 20250.28% 14 Mar 20250.23% 31 Mar 2025−0.05
7 Nov 20240.13% 31 Oct 20240.18% 15 Nov 2024+0.05
8 Aug 20240.22% 31 Jul 20240.16% 15 Aug 2024−0.06

Fails to deliver

The SEC's fails-to-deliver figure for ASMB: 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
2,727
31 Aug 2026
Highest in window
333,324
20 Oct 2025
Days with a balance
46
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for ASSEMBLY BIOSCIENCES, 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 333K shares.

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Sector: Healthcare · By year: 2018 · 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202610.29%−0.12
31 Aug 202610.41%−0.96
14 Aug 202611.37%−3.36
31 Jul 202614.73%+0.15
15 Jul 202614.58%−0.60
30 Jun 202615.18%+3.42
15 Jun 202611.76%+1.14
29 May 202610.62%+0.89
15 May 20269.73%−0.09
30 Apr 20269.82%+0.17
15 Apr 20269.65%−0.01
31 Mar 20269.66%+0.07
13 Mar 20269.59%+0.24
27 Feb 20269.35%−0.04
13 Feb 20269.39%−0.33
30 Jan 20269.72%−0.18
15 Jan 20269.90%+0.14
31 Dec 20259.76%+1.13
15 Dec 20258.63%+0.48
28 Nov 20258.15%−0.11
14 Nov 20258.26%−8.55
31 Oct 202516.81%−3.19
15 Oct 202520.00%+2.37
30 Sep 202517.63%+3.73
15 Sep 202513.90%+2.02
29 Aug 202511.88%+4.96
15 Aug 20256.92%+6.53
31 Jul 20250.39%−0.02
15 Jul 20250.41%0.00
30 Jun 20250.41%+0.19
13 Jun 20250.22%+0.03
30 May 20250.19%−0.16
15 May 20250.35%+0.17
30 Apr 20250.18%−0.07
15 Apr 20250.25%+0.02
31 Mar 20250.23%−0.05
14 Mar 20250.28%−0.04
28 Feb 20250.32%+0.05
14 Feb 20250.27%+0.05
31 Jan 20250.22%−0.01
15 Jan 20250.23%+0.02
31 Dec 20240.21%0.00
13 Dec 20240.21%−0.04
29 Nov 20240.25%+0.07
15 Nov 20240.18%+0.05
31 Oct 20240.13%−0.13
15 Oct 20240.26%−0.02
30 Sep 20240.28%−0.08
13 Sep 20240.36%+0.11
30 Aug 20240.25%+0.09
15 Aug 20240.16%−0.06
31 Jul 20240.22%−0.04
15 Jul 20240.26%−0.08
28 Jun 20240.34%+0.05
14 Jun 20240.29%−0.04
31 May 20240.33%−0.06
15 May 20240.39%−0.06
30 Apr 20240.45%−0.11
15 Apr 20240.56%−0.22
28 Mar 20240.78%+0.24
31 Jan 20240.54%−0.15
12 Jan 20240.69%+0.38
29 Dec 20230.31%−0.08
15 Dec 20230.39%−0.41
30 Nov 20230.80%−0.19
15 Nov 20230.99%−0.21
31 Oct 20231.20%+0.94
13 Oct 20230.26%0.00
29 Sep 20230.26%−0.01
15 Sep 20230.27%+0.03
31 Aug 20230.24%−0.06
15 Aug 20230.30%−0.06
31 Jul 20230.36%+0.04
14 Jul 20230.32%+0.01
30 Jun 20230.31%−0.26
15 Jun 20230.57%+0.02
31 May 20230.55%+0.24
15 May 20230.31%−0.02
28 Apr 20230.33%−0.25
14 Apr 20230.58%+0.26
31 Mar 20230.32%−1.85
30 Nov 20222.17%−0.44
15 Nov 20222.61%−0.30
31 Oct 20222.91%−0.16
14 Oct 20223.07%+0.18
30 Sep 20222.89%+0.09
15 Sep 20222.80%−0.12
31 Aug 20222.92%+0.29
15 Aug 20222.63%+0.01
29 Jul 20222.62%−0.06
15 Jul 20222.68%+0.80
30 Jun 20221.88%−0.41
15 Jun 20222.29%−0.08
31 May 20222.37%−0.40
13 May 20222.77%−0.23
29 Apr 20223.00%+0.01
14 Apr 20222.99%−0.02
31 Mar 20223.01%+0.42
15 Mar 20222.59%+0.13
28 Feb 20222.46%+0.05
15 Feb 20222.41%−0.40
31 Jan 20222.81%+0.24
14 Jan 20222.57%+0.18
31 Dec 20212.39%−0.34
15 Dec 20212.73%−0.52
30 Nov 20213.25%+0.58
15 Nov 20212.67%−0.45
29 Oct 20213.12%+0.60
15 Oct 20212.52%−0.71
30 Sep 20213.23%−0.29
15 Sep 20213.52%−0.07
31 Aug 20213.59%−2.60
13 Aug 20216.19%−0.99
30 Jul 20217.18%−3.28
15 Jul 202110.46%−1.43
30 Jun 202111.89%−0.83
15 Jun 202112.72%+1.03
28 May 202111.69%+0.56
14 May 202111.13%−3.60
30 Apr 202114.73%+2.54
15 Apr 202112.19%−0.61
31 Mar 202112.80%+1.70
15 Mar 202111.10%−0.61
26 Feb 202111.71%+4.17
12 Feb 20217.54%+0.32
29 Jan 20217.22%−0.66
15 Jan 20217.88%−0.38
31 Dec 20208.26%−0.81
15 Dec 20209.07%+0.01
30 Nov 20209.06%+0.36
13 Nov 20208.70%−3.80
30 Oct 202012.50%+0.62
15 Oct 202011.88%+0.15
30 Sep 202011.73%+0.49
15 Sep 202011.24%−0.10
31 Aug 202011.34%+0.02
14 Aug 202011.32%−0.22
31 Jul 202011.54%−0.26
15 Jul 202011.80%+0.64
30 Jun 202011.16%+1.59
15 Jun 20209.57%+0.05
29 May 20209.52%−0.02
15 May 20209.54%+0.11
30 Apr 20209.43%+0.94
15 Apr 20208.49%+0.94
31 Mar 20207.55%+0.68
13 Mar 20206.87%−1.85
28 Feb 20208.72%−0.05
14 Feb 20208.77%−0.06
31 Jan 20208.83%−0.02
15 Jan 20208.85%+0.65
31 Dec 20198.20%−1.86
13 Dec 201910.06%+0.23
29 Nov 20199.83%−0.49
15 Nov 201910.32%+8.78
15 Oct 20191.54%+0.06
30 Sep 20191.48%−0.37
13 Sep 20191.85%−0.26
30 Aug 20192.11%−0.15
15 Aug 20192.26%−0.03
31 Jul 20192.29%−0.41
15 Jul 20192.70%−0.80
28 Jun 20193.50%−1.43
14 Jun 20194.93%−0.68
31 May 20195.61%+0.07
15 May 20195.54%+0.03
30 Apr 20195.51%−3.83
15 Apr 20199.34%+0.79
29 Mar 20198.55%+1.33
15 Mar 20197.22%−0.41
28 Feb 20197.63%+1.01
15 Feb 20196.62%+1.33
31 Jan 20195.29%+1.57
15 Jan 20193.72%+0.62
31 Dec 20183.10%+0.12
14 Dec 20182.98%−0.11
30 Nov 20183.09%−0.49
15 Nov 20183.58%+0.31
31 Oct 20183.27%+0.06
15 Oct 20183.21%−0.54
28 Sep 20183.75%+1.54
14 Sep 20182.21%+0.34
31 Aug 20181.87%−0.09
15 Aug 20181.96%−0.16
31 Jul 20182.12%−0.83
13 Jul 20182.95%−1.17
29 Jun 20184.12%+0.74
15 Jun 20183.38%−0.01
31 May 20183.39%−0.15
15 May 20183.54%+0.70
30 Apr 20182.84%+0.36
13 Apr 20182.48%+0.51
29 Mar 20181.97%+0.21
15 Mar 20181.76%−1.34
28 Feb 20183.10%−0.35
15 Feb 20183.45%+0.41
31 Jan 20183.04%+1.13
12 Jan 20181.91%−0.15
29 Dec 20172.06%–

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

Frequently asked questions

How shorted is ASSEMBLY BIOSCIENCES, INC. right now?
10.29% of ASSEMBLY BIOSCIENCES, INC.'s (ASMB) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 641st 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 ASMB'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 ASMB's days to cover?
6.26 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.