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HowShorted

How shorted is Acumen Pharmaceuticals, Inc.? ABOS

#2,100most shorted US stockof 3,805 ranked stocks, more shorted than 44%

3.88%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.49
5 reports (~10 weeks)
+0.02
days to cover
8.16
Aggregate net short position time series for Acumen Pharmaceuticals, 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 Acumen Pharmaceuticals, 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
12 Aug 20264.66% 31 Jul 20264.46% 14 Aug 2026−0.20
12 May 20262.32% 30 Apr 20262.42% 15 May 2026+0.10
26 Mar 20261.70% 13 Mar 20261.46% 31 Mar 2026−0.24
12 Nov 20252.27% 31 Oct 20252.18% 14 Nov 2025−0.09
12 Aug 20252.31% 31 Jul 20252.28% 15 Aug 2025−0.03
13 May 20252.89% 30 Apr 20253.10% 15 May 2025+0.21
27 Mar 20252.96% 14 Mar 20252.73% 31 Mar 2025−0.23
12 Nov 20242.41% 31 Oct 20242.44% 15 Nov 2024+0.03

Fails to deliver

The SEC's fails-to-deliver figure for ABOS: 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
52
8 Sep 2026
Highest in window
12,263
28 Jan 2026
Days with a balance
26
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Acumen Pharmaceuticals, 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 12K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20263.88%−0.49
31 Aug 20264.37%−0.09
14 Aug 20264.46%−0.20
31 Jul 20264.66%+0.76
15 Jul 20263.90%+0.04
30 Jun 20263.86%+1.25
15 Jun 20262.61%−0.01
29 May 20262.62%+0.20
15 May 20262.42%+0.10
30 Apr 20262.32%+0.18
15 Apr 20262.14%+0.68
31 Mar 20261.46%−0.24
13 Mar 20261.70%+0.11
27 Feb 20261.59%+0.03
13 Feb 20261.56%+0.07
30 Jan 20261.49%+0.50
15 Jan 20260.99%+0.08
31 Dec 20250.91%−0.03
15 Dec 20250.94%−0.01
28 Nov 20250.95%−1.23
14 Nov 20252.18%−0.09
31 Oct 20252.27%+0.07
15 Oct 20252.20%+0.03
30 Sep 20252.17%−0.07
15 Sep 20252.24%−0.08
29 Aug 20252.32%+0.04
15 Aug 20252.28%−0.03
31 Jul 20252.31%−0.18
15 Jul 20252.49%−0.33
30 Jun 20252.82%−1.60
13 Jun 20254.42%+0.22
30 May 20254.20%+1.10
15 May 20253.10%+0.21
30 Apr 20252.89%−0.01
15 Apr 20252.90%+0.17
31 Mar 20252.73%−0.23
14 Mar 20252.96%−0.03
28 Feb 20252.99%+0.09
14 Feb 20252.90%−0.16
31 Jan 20253.06%+0.02
15 Jan 20253.04%+0.45
31 Dec 20242.59%+0.22
13 Dec 20242.37%+0.06
29 Nov 20242.31%−0.13
15 Nov 20242.44%+0.03
31 Oct 20242.41%+0.30
15 Oct 20242.11%−0.49
30 Sep 20242.60%−0.22
13 Sep 20242.82%0.00
30 Aug 20242.82%−0.26
15 Aug 20243.08%−0.03
31 Jul 20243.11%+0.35
15 Jul 20242.76%+1.11
28 Jun 20241.65%+0.47
14 Jun 20241.18%0.00
31 May 20241.18%−0.18
15 May 20241.36%−0.18
30 Apr 20241.54%−0.21
15 Apr 20241.75%−0.31
28 Mar 20242.06%+0.30
15 Mar 20241.76%+0.42
29 Feb 20241.34%+0.17
15 Feb 20241.17%−0.09
31 Jan 20241.26%+0.05
12 Jan 20241.21%+0.42
29 Dec 20230.79%−0.26
15 Dec 20231.05%+0.12
30 Nov 20230.93%+0.03
15 Nov 20230.90%−2.62
13 Oct 20233.52%−0.05
29 Sep 20233.57%+0.53
15 Sep 20233.04%+0.01
31 Aug 20233.03%+0.23
15 Aug 20232.80%+2.33
30 Jun 20230.47%+0.10
15 Jun 20230.37%−0.22
31 May 20230.59%−0.85
14 Apr 20231.44%−0.02
31 Mar 20231.46%−0.05
15 Mar 20231.51%−0.04
28 Feb 20231.55%+0.09
15 Feb 20231.46%−0.03
31 Jan 20231.49%+0.02
13 Jan 20231.47%+0.07
30 Dec 20221.40%−0.74
15 Dec 20222.14%+0.42
30 Nov 20221.72%−0.18
15 Nov 20221.90%−0.63
31 Oct 20222.53%−0.75
14 Oct 20223.28%+1.56
15 Sep 20221.72%−0.01
31 Aug 20221.73%−0.82
15 Aug 20222.55%+0.55
29 Jul 20222.00%−0.35
15 Jul 20222.35%−0.37
30 Jun 20222.72%−2.28
15 Jun 20225.00%−0.49
31 May 20225.49%+0.54
13 May 20224.95%+0.27
29 Apr 20224.68%+0.22
14 Apr 20224.46%+0.27
31 Mar 20224.19%+1.34
15 Mar 20222.85%+0.50
28 Feb 20222.35%+0.09
15 Feb 20222.26%−0.22
31 Jan 20222.48%+0.09
14 Jan 20222.39%−0.10
31 Dec 20212.49%+0.09
15 Dec 20212.40%+0.93
30 Nov 20211.47%−0.14
15 Nov 20211.61%+1.60
13 Aug 20210.01%–

Newest first. Scroll inside the table for earlier dates, back to 13 Aug 2021.

Frequently asked questions

How shorted is Acumen Pharmaceuticals, Inc. right now?
3.88% of Acumen Pharmaceuticals, Inc.'s (ABOS) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,100th 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 ABOS'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 ABOS's days to cover?
8.16 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.