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HowShorted

How shorted is Alkermes plc? ALKS

#814most shorted US stockof 3,805 ranked stocks, more shorted than 78%

9.03%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.26
5 reports (~10 weeks)
−1.45
days to cover
10.70
Aggregate net short position time series for Alkermes plc

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 Alkermes plc 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
28 Jul 20269.01% 15 Jul 20268.59% 31 Jul 2026−0.42
5 May 202611.86% 30 Apr 202610.97% 15 May 2026−0.89
25 Feb 202610.79% 13 Feb 202611.02% 27 Feb 2026+0.23
12 Jan 202613.23% 31 Dec 202513.12% 15 Jan 2026−0.11
28 Oct 20258.72% 15 Oct 20259.63% 31 Oct 2025+0.91
22 Oct 20258.72% 15 Oct 20259.63% 31 Oct 2025+0.91
29 Jul 20257.62% 15 Jul 20258.37% 31 Jul 2025+0.75
1 May 20257.74% 30 Apr 20256.83% 15 May 2025−0.91

Fails to deliver

The SEC's fails-to-deliver figure for ALKS: 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
566
24 Aug 2026
Highest in window
1,210,208
13 Nov 2025
Days with a balance
46
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Alkermes plc 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 1.2M shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20269.03%+0.26
31 Aug 20268.77%−0.03
14 Aug 20268.80%+0.21
31 Jul 20268.59%−0.42
15 Jul 20269.01%−1.47
30 Jun 202610.48%−0.30
15 Jun 202610.78%+0.37
29 May 202610.41%−0.56
15 May 202610.97%−0.89
30 Apr 202611.86%−0.06
15 Apr 202611.92%+0.40
31 Mar 202611.52%−0.96
13 Mar 202612.48%+1.46
27 Feb 202611.02%+0.23
13 Feb 202610.79%−0.71
30 Jan 202611.50%−1.62
15 Jan 202613.12%−0.11
31 Dec 202513.23%+1.10
15 Dec 202512.13%+0.73
28 Nov 202511.40%+0.93
14 Nov 202510.47%+0.84
31 Oct 20259.63%+0.91
15 Oct 20258.72%−0.50
30 Sep 20259.22%+0.10
15 Sep 20259.12%+1.06
29 Aug 20258.06%−0.31
15 Aug 20258.37%0.00
31 Jul 20258.37%+0.75
15 Jul 20257.62%+0.43
30 Jun 20257.19%+0.78
13 Jun 20256.41%−0.60
30 May 20257.01%+0.18
15 May 20256.83%−0.91
30 Apr 20257.74%+0.14
15 Apr 20257.60%+0.83
31 Mar 20256.77%−1.19
14 Mar 20257.96%−0.65
28 Feb 20258.61%+1.49
14 Feb 20257.12%+0.43
31 Jan 20256.69%−0.34
15 Jan 20257.03%+0.39
31 Dec 20246.64%−1.09
13 Dec 20247.73%−0.74
29 Nov 20248.47%−1.77
15 Nov 202410.24%+0.28
31 Oct 20249.96%+0.35
15 Oct 20249.61%−0.82
30 Sep 202410.43%−0.88
13 Sep 202411.31%+0.87
30 Aug 202410.44%−0.31
15 Aug 202410.75%−0.51
31 Jul 202411.26%+1.73
15 Jul 20249.53%+1.45
28 Jun 20248.08%+1.01
14 Jun 20247.07%+0.14
31 May 20246.93%−0.72
15 May 20247.65%+0.03
30 Apr 20247.62%−0.47
15 Apr 20248.09%−0.49
28 Mar 20248.58%+0.15
15 Mar 20248.43%+0.64
29 Feb 20247.79%+0.48
15 Feb 20247.31%+0.32
31 Jan 20246.99%−0.94
12 Jan 20247.93%−0.47
29 Dec 20238.40%+2.60
15 Dec 20235.80%+1.14
30 Nov 20234.66%−0.11
15 Nov 20234.77%−0.02
31 Oct 20234.79%+0.43
13 Oct 20234.36%−0.88
29 Sep 20235.24%−0.59
15 Sep 20235.83%+0.14
31 Aug 20235.69%+0.79
15 Aug 20234.90%+1.23
31 Jul 20233.67%+0.03
14 Jul 20233.64%+0.13
30 Jun 20233.51%−0.35
15 Jun 20233.86%−0.43
31 May 20234.29%−0.20
15 May 20234.49%−0.08
28 Apr 20234.57%−0.80
14 Apr 20235.37%−0.30
31 Mar 20235.67%−0.09
15 Mar 20235.76%+0.30
28 Feb 20235.46%0.00
15 Feb 20235.46%−0.10
31 Jan 20235.56%−0.14
13 Jan 20235.70%+0.11
30 Dec 20225.59%+0.19
15 Dec 20225.40%+0.08
30 Nov 20225.32%−0.23
15 Nov 20225.55%+0.15
31 Oct 20225.40%−0.13
14 Oct 20225.53%−0.04
30 Sep 20225.57%+0.25
15 Sep 20225.32%+0.26
31 Aug 20225.06%+0.39
15 Aug 20224.67%+0.02
29 Jul 20224.65%+0.13
15 Jul 20224.52%+0.06
30 Jun 20224.46%+0.26
15 Jun 20224.20%+0.56
31 May 20223.64%−0.44
13 May 20224.08%+0.22
29 Apr 20223.86%−0.63
14 Apr 20224.49%−0.79
31 Mar 20225.28%−0.30
15 Mar 20225.58%−0.53
28 Feb 20226.11%−1.10
15 Feb 20227.21%+0.79
31 Jan 20226.42%−0.32
14 Jan 20226.74%−1.33
31 Dec 20218.07%+0.19
15 Dec 20217.88%+0.85
30 Nov 20217.03%+0.03
15 Nov 20217.00%−0.48
29 Oct 20217.48%+0.27
15 Oct 20217.21%+0.52
30 Sep 20216.69%+0.10
15 Sep 20216.59%+0.18
31 Aug 20216.41%−0.44
13 Aug 20216.85%−0.53
30 Jul 20217.38%−0.02
15 Jul 20217.40%−0.15
30 Jun 20217.55%+0.92
15 Jun 20216.63%+0.08
28 May 20216.55%−0.48
14 May 20217.03%+0.13
30 Apr 20216.90%−0.77
15 Apr 20217.67%−0.10
31 Mar 20217.77%+0.23
15 Mar 20217.54%+0.42
26 Feb 20217.12%+0.04
12 Feb 20217.08%−0.43
29 Jan 20217.51%−0.26
15 Jan 20217.77%+0.54
31 Dec 20207.23%+0.12
15 Dec 20207.11%−0.10
30 Nov 20207.21%−0.09
13 Nov 20207.30%−0.42
30 Oct 20207.72%+0.82
15 Oct 20206.90%+1.29
30 Sep 20205.61%−0.54
15 Sep 20206.15%−0.08
31 Aug 20206.23%−0.39
14 Aug 20206.62%−0.35
31 Jul 20206.97%+0.36
15 Jul 20206.61%−0.90
30 Jun 20207.51%+0.30
15 Jun 20207.21%+0.34
29 May 20206.87%+0.13
15 May 20206.74%+1.12
30 Apr 20205.62%−0.27
15 Apr 20205.89%+0.84
31 Mar 20205.05%+0.96
13 Mar 20204.09%+0.46
28 Feb 20203.63%−0.01
14 Feb 20203.64%−0.23
31 Jan 20203.87%+0.49
15 Jan 20203.38%+0.05
31 Dec 20193.33%+0.31
13 Dec 20193.02%−1.02
29 Nov 20194.04%−0.74
15 Nov 20194.78%+0.56
31 Oct 20194.22%+0.58
15 Oct 20193.64%+0.08
30 Sep 20193.56%+0.01
13 Sep 20193.55%−0.01
30 Aug 20193.56%+0.05
15 Aug 20193.51%+0.01
31 Jul 20193.50%+0.16
15 Jul 20193.34%+0.18
28 Jun 20193.16%+0.41
14 Jun 20192.75%+0.27
31 May 20192.48%+0.03
15 May 20192.45%−0.19
30 Apr 20192.64%0.00
15 Apr 20192.64%−0.45
29 Mar 20193.09%+0.12
15 Mar 20192.97%+0.04
28 Feb 20192.93%+0.01
15 Feb 20192.92%+0.20
31 Jan 20192.72%−0.33
15 Jan 20193.05%−0.01
31 Dec 20183.06%−0.60
14 Dec 20183.66%−0.29
30 Nov 20183.95%−0.38
15 Nov 20184.33%−0.29
31 Oct 20184.62%−0.21
15 Oct 20184.83%+0.19
28 Sep 20184.64%−0.16
14 Sep 20184.80%+0.20
31 Aug 20184.60%−0.03
15 Aug 20184.63%−0.05
31 Jul 20184.68%−0.11
13 Jul 20184.79%−0.24
29 Jun 20185.03%−0.46
15 Jun 20185.49%+0.19
31 May 20185.30%−0.38
15 May 20185.68%−0.06
30 Apr 20185.74%−0.71
13 Apr 20186.45%+0.69
29 Mar 20185.76%−0.15
15 Mar 20185.91%−0.54
28 Feb 20186.45%−1.09
15 Feb 20187.54%+0.12
31 Jan 20187.42%−0.12
12 Jan 20187.54%+0.55
29 Dec 20176.99%–

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

Frequently asked questions

How shorted is Alkermes plc right now?
9.03% of Alkermes plc's (ALKS) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 814th 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 ALKS'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 ALKS's days to cover?
10.70 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.