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HowShorted

How shorted is ACADIA PHARMACEUTICALS INC? ACAD

#1,489most shorted US stockof 3,805 ranked stocks, more shorted than 60%

5.61%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.04
5 reports (~10 weeks)
−0.79
days to cover
7.22
Aggregate net short position time series for ACADIA 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 ACADIA 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
4 Aug 20266.27% 31 Jul 20265.50% 14 Aug 2026−0.77
6 May 20266.52% 30 Apr 20266.67% 15 May 2026+0.15
25 Feb 20265.26% 13 Feb 20265.61% 27 Feb 2026+0.35
13 Jan 20264.97% 31 Dec 20254.95% 15 Jan 2026−0.02
5 Nov 20255.03% 31 Oct 20255.59% 14 Nov 2025+0.56
6 Aug 20256.54% 31 Jul 20255.92% 15 Aug 2025−0.62
7 May 20259.12% 30 Apr 20259.11% 15 May 2025−0.01
26 Feb 20259.14% 14 Feb 20258.65% 28 Feb 2025−0.49

Fails to deliver

The SEC's fails-to-deliver figure for ACAD: 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
1,281
4 Sep 2026
Highest in window
125,994
23 Jan 2026
Days with a balance
34
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for ACADIA 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 126K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20265.61%−0.04
31 Aug 20265.65%+0.15
14 Aug 20265.50%−0.77
31 Jul 20266.27%−0.17
15 Jul 20266.44%+0.04
30 Jun 20266.40%−0.50
15 Jun 20266.90%+0.04
29 May 20266.86%+0.19
15 May 20266.67%+0.15
30 Apr 20266.52%+0.03
15 Apr 20266.49%+0.20
31 Mar 20266.29%+1.19
13 Mar 20265.10%−0.51
27 Feb 20265.61%+0.35
13 Feb 20265.26%−0.24
30 Jan 20265.50%+0.55
15 Jan 20264.95%−0.02
31 Dec 20254.97%−0.16
15 Dec 20255.13%−0.14
28 Nov 20255.27%−0.32
14 Nov 20255.59%+0.56
31 Oct 20255.03%−0.16
15 Oct 20255.19%−0.39
30 Sep 20255.58%+0.85
15 Sep 20254.73%−0.77
29 Aug 20255.50%−0.42
15 Aug 20255.92%−0.62
31 Jul 20256.54%−0.32
15 Jul 20256.86%−0.80
30 Jun 20257.66%−1.56
13 Jun 20259.22%−0.73
30 May 20259.95%+0.84
15 May 20259.11%−0.01
30 Apr 20259.12%−0.09
15 Apr 20259.21%−0.17
31 Mar 20259.38%+0.71
14 Mar 20258.67%+0.02
28 Feb 20258.65%−0.49
14 Feb 20259.14%−0.61
31 Jan 20259.75%−0.54
15 Jan 202510.29%+3.85
31 Dec 20246.44%+0.82
13 Dec 20245.62%−0.33
29 Nov 20245.95%−0.21
15 Nov 20246.16%+0.43
31 Oct 20245.73%+0.80
15 Oct 20244.93%+0.12
30 Sep 20244.81%−0.76
13 Sep 20245.57%−0.62
30 Aug 20246.19%−0.24
15 Aug 20246.43%−0.51
31 Jul 20246.94%+0.08
15 Jul 20246.86%−0.36
28 Jun 20247.22%−0.43
14 Jun 20247.65%+0.30
31 May 20247.35%+0.10
15 May 20247.25%−0.03
30 Apr 20247.28%+0.48
15 Apr 20246.80%−0.02
28 Mar 20246.82%+0.35
15 Mar 20246.47%−0.11
29 Feb 20246.58%+0.84
15 Feb 20245.74%+1.06
31 Jan 20244.68%−0.26
12 Jan 20244.94%+0.12
29 Dec 20234.82%+0.14
15 Dec 20234.68%−0.03
30 Nov 20234.71%−0.03
15 Nov 20234.74%+0.15
31 Oct 20234.59%+0.16
13 Oct 20234.43%−1.04
29 Sep 20235.47%−1.07
15 Sep 20236.54%+0.32
31 Aug 20236.22%+0.25
15 Aug 20235.97%+0.56
31 Jul 20235.41%+0.01
14 Jul 20235.40%+0.26
30 Jun 20235.14%−0.63
15 Jun 20235.77%−0.40
31 May 20236.17%+0.04
15 May 20236.13%+0.19
28 Apr 20235.94%0.00
14 Apr 20235.94%+0.89
31 Mar 20235.05%−0.20
15 Mar 20235.25%+0.28
28 Feb 20234.97%−0.01
15 Feb 20234.98%−0.02
31 Jan 20235.00%+0.05
13 Jan 20234.95%−0.23
30 Dec 20225.18%−0.19
15 Dec 20225.37%−0.60
30 Nov 20225.97%+0.39
15 Nov 20225.58%−0.87
31 Oct 20226.45%+0.57
14 Oct 20225.88%−0.10
30 Sep 20225.98%+0.05
15 Sep 20225.93%−0.23
31 Aug 20226.16%−0.09
15 Aug 20226.25%+0.27
29 Jul 20225.98%−0.04
15 Jul 20226.02%−0.46
30 Jun 20226.48%−0.78
15 Jun 20227.26%−0.73
31 May 20227.99%−0.08
13 May 20228.07%+0.64
29 Apr 20227.43%+2.39
14 Apr 20225.04%+0.76
31 Mar 20224.28%−0.15
15 Mar 20224.43%+0.68
28 Feb 20223.75%+0.05
15 Feb 20223.70%+0.23
31 Jan 20223.47%−0.73
14 Jan 20224.20%+0.08
31 Dec 20214.12%+0.08
15 Dec 20214.04%+0.43
30 Nov 20213.61%−0.94
15 Nov 20214.55%−0.32
29 Oct 20214.87%+0.14
15 Oct 20214.73%+0.31
30 Sep 20214.42%+0.05
15 Sep 20214.37%−0.16
31 Aug 20214.53%−0.38
13 Aug 20214.91%−0.13
30 Jul 20215.04%+0.03
15 Jul 20215.01%−0.09
30 Jun 20215.10%+1.37
15 Jun 20213.73%+0.11
28 May 20213.62%−0.90
14 May 20214.52%−0.16
30 Apr 20214.68%−0.31
15 Apr 20214.99%+0.61
31 Mar 20214.38%+0.31
15 Mar 20214.07%−0.06
26 Feb 20214.13%+0.30
12 Feb 20213.83%+0.01
29 Jan 20213.82%−0.10
15 Jan 20213.92%−0.06
31 Dec 20203.98%−0.44
15 Dec 20204.42%−0.51
30 Nov 20204.93%−0.10
13 Nov 20205.03%−0.53
30 Oct 20205.56%−0.08
15 Oct 20205.64%−0.20
30 Sep 20205.84%+0.15
15 Sep 20205.69%−0.23
31 Aug 20205.92%−0.01
14 Aug 20205.93%−0.34
31 Jul 20206.27%+0.17
15 Jul 20206.10%−0.21
30 Jun 20206.31%−1.07
15 Jun 20207.38%+0.17
29 May 20207.21%−0.18
15 May 20207.39%+0.01
30 Apr 20207.38%−0.43
15 Apr 20207.81%+0.42
31 Mar 20207.39%−0.41
13 Mar 20207.80%+0.25
28 Feb 20207.55%+0.17
14 Feb 20207.38%−0.03
31 Jan 20207.41%+0.09
15 Jan 20207.32%+0.11
31 Dec 20197.21%+0.48
13 Dec 20196.73%−0.21
29 Nov 20196.94%+0.02
15 Nov 20196.92%+0.06
31 Oct 20196.86%−0.83
15 Oct 20197.69%+0.01
30 Sep 20197.68%−0.44
13 Sep 20198.12%−0.63
30 Aug 20198.75%−0.16
15 Aug 20198.91%−0.28
31 Jul 20199.19%0.00
15 Jul 20199.19%−0.39
28 Jun 20199.58%+1.16
14 Jun 20198.42%−0.08
31 May 20198.50%+0.18
15 May 20198.32%+0.57
30 Apr 20197.75%+0.34
15 Apr 20197.41%0.00
29 Mar 20197.41%+0.15
15 Mar 20197.26%+0.31
28 Feb 20196.95%−0.04
15 Feb 20196.99%−0.79
31 Jan 20197.78%−1.62
15 Jan 20199.40%−0.29
31 Dec 20189.69%−0.34
14 Dec 201810.03%−1.18
30 Nov 201811.21%−1.63
15 Nov 201812.84%+0.10
31 Oct 201812.74%−2.01
15 Oct 201814.75%−0.31
28 Sep 201815.06%+2.14
14 Sep 201812.92%+0.24
31 Aug 201812.68%−0.26
15 Aug 201812.94%−0.28
31 Jul 201813.22%+0.18
13 Jul 201813.04%−1.13
29 Jun 201814.17%+1.98
15 Jun 201812.19%+2.08
31 May 201810.11%+0.53
15 May 20189.58%−1.11
30 Apr 201810.69%+0.10
13 Apr 201810.59%+1.51
29 Mar 20189.08%+0.01
15 Mar 20189.07%+0.77
28 Feb 20188.30%−1.00
15 Feb 20189.30%−0.62
31 Jan 20189.92%+0.39
12 Jan 20189.53%+1.56
29 Dec 20177.97%–

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

Frequently asked questions

How shorted is ACADIA PHARMACEUTICALS INC right now?
5.61% of ACADIA PHARMACEUTICALS INC's (ACAD) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,489th 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 ACAD'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 ACAD's days to cover?
7.22 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.