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Mirion MIR

US equityMarket cap rank #2345
$14.92 +$0.32 (+2.19%)
Market closed · Oct 5, 10:20 pm ET · Last extended-hours $14.92 0.00%
Open$14.55
Prev close$14.60
Day range$14.28 – $15.05
Volume4.43M
Market cap$3.63B
P/E (TTM)165.8
Dividend yield–

Ownership & positioning

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

Institutional ownership112.2%-0.38 pts vs. prior quarter
Institutions holding420-2 vs. prior quarter
Insider trades (recent)21 buys / 29 sellsNet selling
Short interest16.32% of floatDays to cover 10.7 · as of 15 Sep 2026
Short-sale volume share26.0%5-day average of daily volume

Short-sale volume as % of daily volume

20%24%28%33%Sep '26Sep '26Oct '26

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$5.74M (4 inflow days, 16 outflow days).

The five largest holders on file together own 38.5% of shares outstanding.

Largest holders

  • BlackRock15.73%
  • Vanguard Portfolio Management, LLC7.47%
  • T. Rowe Price Group, Inc.6.05%
  • Vanguard Capital Management, LLC5.07%
  • Kuwait Investment Authority4.18%
  • State Street Global Advisors4.08%
  • Alyeska Investment Group, L.P.3.92%
  • Omega Advisors, Inc.3.45%

By investor type

  • Mutual Fund87.52%
  • Hedge Fund14.33%
  • Sovereign Wealth Fund4.24%
  • Public Company4.11%
  • Individual/Insider3.55%
  • Government Pension Fund0.99%
  • Private Company0.55%
  • Insurance Company0.35%

Reported short interest has risen from 14.36% to 16.32% 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 39,703,629 16.3% 10.7
31 Aug 2026 35,906,916 14.8% 11.0
14 Aug 2026 32,513,654 13.4% 8.5
31 Jul 2026 34,203,650 14.1% 7.5
15 Jul 2026 34,652,952 14.2% 9.8
30 Jun 2026 35,142,853 14.4% 6.4

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