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Mirum Pharmaceuticals MIRM

US equityMarket cap rank #2052
$81.43 −$1.50 (-1.81%)
Market closed · Oct 5, 8:10 pm ET · Last extended-hours $82.35 +1.13%
Open$83.30
Prev close$82.93
Day range$81.23 – $83.35
Volume980.1K
Market cap$5.29B
P/E (TTM)–
Dividend yield–

Ownership & positioning

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

Short interest9.67% of floatDays to cover 12.0 · as of 15 Sep 2026
Short-sale volume share13.7%5-day average of daily volume

Short-sale volume as % of daily volume

9%14%20%25%Sep '26Sep '26Oct '26

Reported short interest has fallen from 12.27% to 9.67% 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 6,281,413 9.7% 12.0
31 Aug 2026 6,171,979 9.5% 13.2
14 Aug 2026 6,489,383 10.0% 7.3
31 Jul 2026 6,823,706 11.2% 12.1
15 Jul 2026 7,272,892 11.9% 10.6
30 Jun 2026 7,483,286 12.3% 5.0

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