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HowShorted

How shorted is Adicet Bio, Inc.? ACET

#2,515most shorted US stockof 3,805 ranked stocks, more shorted than 33%

The ticker ACET previously referred to Aceto Corporation (to 2019).

2.91%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.21
5 reports (~10 weeks)
−2.36
days to cover
2.08
Aggregate net short position time series for Adicet 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 Adicet 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
5 Aug 20264.14% 31 Jul 20262.80% 14 Aug 2026−1.34
13 May 20265.77% 30 Apr 20266.13% 15 May 2026+0.36
5 Nov 20259.57% 31 Oct 20255.44% 14 Nov 2025−4.13
7 Aug 20254.88% 31 Jul 20255.36% 15 Aug 2025+0.48
6 May 20252.47% 30 Apr 20252.86% 15 May 2025+0.39
6 Mar 20253.81% 28 Feb 20253.43% 14 Mar 2025−0.38
6 Nov 20244.18% 31 Oct 20244.43% 15 Nov 2024+0.25
13 Aug 20245.62% 31 Jul 20245.55% 15 Aug 2024−0.07

Fails to deliver

The SEC's fails-to-deliver figure for ACET: 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
3
21 Aug 2026
Highest in window
180,031
8 Oct 2025
Days with a balance
38
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Adicet 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 180K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20262.91%+0.21
31 Aug 20262.70%−0.10
14 Aug 20262.80%−1.34
31 Jul 20264.14%+0.15
15 Jul 20263.99%−1.28
30 Jun 20265.27%+0.05
15 Jun 20265.22%−0.18
29 May 20265.40%−0.73
15 May 20266.13%+0.36
30 Apr 20265.77%−0.47
15 Apr 20266.24%−0.60
31 Mar 20266.84%+0.22
13 Mar 20266.62%−3.11
15 Dec 20259.73%+2.79
28 Nov 20256.94%+1.50
14 Nov 20255.44%−4.13
31 Oct 20259.57%+0.70
15 Oct 20258.87%+3.12
30 Sep 20255.75%+0.01
15 Sep 20255.74%+0.24
29 Aug 20255.50%+0.14
15 Aug 20255.36%+0.48
31 Jul 20254.88%+0.33
15 Jul 20254.55%+0.54
30 Jun 20254.01%+0.51
13 Jun 20253.50%−0.28
30 May 20253.78%+0.92
15 May 20252.86%+0.39
30 Apr 20252.47%−0.03
15 Apr 20252.50%−0.95
31 Mar 20253.45%+0.02
14 Mar 20253.43%−0.38
28 Feb 20253.81%−0.78
14 Feb 20254.59%+0.98
31 Jan 20253.61%−0.10
15 Jan 20253.71%−0.38
31 Dec 20244.09%+0.02
13 Dec 20244.07%+0.44
29 Nov 20243.63%−0.80
15 Nov 20244.43%+0.25
31 Oct 20244.18%+0.02
15 Oct 20244.16%−0.35
30 Sep 20244.51%−0.57
13 Sep 20245.08%+0.11
30 Aug 20244.97%−0.58
15 Aug 20245.55%−0.07
31 Jul 20245.62%−0.88
15 Jul 20246.50%−1.32
28 Jun 20247.82%−0.81
14 Jun 20248.63%+0.33
31 May 20248.30%−0.15
15 May 20248.45%−0.89
30 Apr 20249.34%−0.22
15 Apr 20249.56%+0.20
28 Mar 20249.36%+2.28
15 Mar 20247.08%−6.03
29 Feb 202413.11%+2.11
15 Feb 202411.00%+1.98
31 Jan 20249.02%+1.58
12 Jan 20247.44%+1.30
29 Dec 20236.14%+0.29
15 Dec 20235.85%−1.37
30 Nov 20237.22%+0.20
15 Nov 20237.02%+0.43
31 Oct 20236.59%−0.39
13 Oct 20236.98%+0.02
29 Sep 20236.96%+0.16
15 Sep 20236.80%+0.54
31 Aug 20236.26%+0.53
15 Aug 20235.73%+0.38
31 Jul 20235.35%−1.53
14 Jul 20236.88%−0.43
30 Jun 20237.31%−1.02
15 Jun 20238.33%+1.09
31 May 20237.24%+0.41
15 May 20236.83%−0.56
28 Apr 20237.39%+1.02
14 Apr 20236.37%−0.18
31 Mar 20236.55%−0.52
15 Mar 20237.07%−0.61
28 Feb 20237.68%−0.34
15 Feb 20238.02%+0.60
31 Jan 20237.42%−1.33
13 Jan 20238.75%−0.16
30 Dec 20228.91%−0.65
15 Dec 20229.56%+0.17
30 Nov 20229.39%+2.16
15 Nov 20227.23%−1.73
31 Oct 20228.96%−0.46
14 Oct 20229.42%−0.48
30 Sep 20229.90%+2.29
15 Sep 20227.61%+0.59
31 Aug 20227.02%+0.68
15 Aug 20226.34%−6.74
29 Jul 202213.08%−0.18
15 Jul 202213.26%−1.13
30 Jun 202214.39%0.00
15 Jun 202214.39%+5.67
31 May 20228.72%+1.10
13 May 20227.62%+1.82
29 Apr 20225.80%+2.38
14 Apr 20223.42%+0.74
31 Mar 20222.68%+0.34
15 Mar 20222.34%−0.43
28 Feb 20222.77%−1.68
15 Feb 20224.45%+2.16
31 Jan 20222.29%+1.35
30 Nov 20210.94%−0.22
15 Nov 20211.16%−0.14
29 Oct 20211.30%+0.07
15 Oct 20211.23%0.00
30 Sep 20211.23%−0.07
15 Sep 20211.30%−0.15
31 Aug 20211.45%−0.53
13 Aug 20211.98%−0.01
30 Jul 20211.99%−0.21
15 Jul 20212.20%−0.24
30 Jun 20212.44%+1.00
15 Jun 20211.44%−0.11
28 May 20211.55%+0.04
14 May 20211.51%+0.04
30 Apr 20211.47%+0.05
15 Apr 20211.42%+0.17
31 Mar 20211.25%+0.43
15 Mar 20210.82%−0.30
26 Feb 20211.12%+0.31
12 Feb 20210.81%+0.09
29 Jan 20210.72%−0.02
15 Jan 20210.74%−0.10
31 Dec 20200.84%+0.08
15 Dec 20200.76%+0.09
30 Nov 20200.67%+0.06
13 Nov 20200.61%+0.24
30 Oct 20200.37%−0.13
15 Oct 20200.50%−0.74
15 Sep 20201.24%+0.27
31 Aug 20200.97%0.00
14 Aug 20200.97%−0.26
31 Jul 20201.23%−0.09
15 Jul 20201.32%−0.22
30 Jun 20201.54%−0.50
15 Jun 20202.04%+0.14
29 May 20201.90%−0.56
15 May 20202.46%+0.47
30 Apr 20201.99%−0.78
15 Apr 20202.77%−1.03
31 Mar 20203.80%−2.25
13 Mar 20206.05%+0.82
28 Feb 20205.23%−0.16
14 Feb 20205.39%−1.42
31 Jan 20206.81%+1.71
15 Jan 20205.10%−5.93
15 Nov 201911.03%+0.62
31 Oct 201910.41%+1.66
15 Oct 20198.75%–

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

Frequently asked questions

How shorted is Adicet Bio, Inc. right now?
2.91% of Adicet Bio, Inc.'s (ACET) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,515th 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 ACET'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 ACET's days to cover?
2.08 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.