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Alkermes ALKS

US equityMarket cap rank #1744
$42.76 +$1.01 (+2.42%)
Market closed · Oct 5, 8:10 pm ET · Last extended-hours $43.42 +1.54%
Open$42.07
Prev close$41.75
Day range$41.67 – $43.22
Volume3.13M
Market cap$7.17B
P/E (TTM)112.5
Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Short interest9.03% of floatDays to cover 10.7 · as of 15 Sep 2026
Short-sale volume share17.3%5-day average of daily volume

Short-sale volume as % of daily volume

7%14%21%28%Sep '26Sep '26Oct '26

Reported short interest has fallen from 10.48% to 9.03% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Short interest, by report

Report dateShares short% of floatDays to cover
15 Sep 2026 15,156,775 9.0% 10.7
31 Aug 2026 14,717,404 8.8% 11.8
14 Aug 2026 14,761,342 8.8% 10.2
31 Jul 2026 14,406,911 8.6% 7.7
15 Jul 2026 15,017,743 9.0% 9.1
30 Jun 2026 17,464,944 10.5% 4.8

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