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Ionis Pharmaceuticals IONS

US equityMarket cap rank #1735
$43.50 −$0.04 (-0.09%)
Market closed · Oct 5, 9:30 pm ET · Last extended-hours $43.57 +0.16%
Open$43.75
Prev close$43.54
Day range$42.63 – $43.96
Volume2.87M
Market cap$7.23B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Short interest12.57% of floatDays to cover 5.2 · as of 15 Sep 2026
Short-sale volume share11.7%5-day average of daily volume

Short-sale volume as % of daily volume

6%12%19%25%Sep '26Sep '26Oct '26

Reported short interest has risen from 10.54% to 12.57% 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 20,890,252 12.6% 5.2
31 Aug 2026 20,924,638 12.6% 9.2
14 Aug 2026 20,909,181 12.6% 9.6
31 Jul 2026 21,466,123 12.9% 6.4
15 Jul 2026 20,042,879 12.1% 3.7
30 Jun 2026 17,425,020 10.5% 7.3

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