Ticker · CUSIP 60471A101

MIR

MIRION TECHNOLOGIES INC
Industrials·Specialty Industrial Machinery
···Share
Holders (tracked)
16
Combined shares
14,554,695
Combined value
$321.35M
Last close
$19.27
Quarter
2025Q4
Tracked holders · last 8 quarters
+3 vs previous quarter over the last 8.
1692024Q12025Q4
Price is -12.7% vs the avg quarter-end implied price across tracked holders.

SEC event timeline

24 events
  1. Ron Baron (Baron Capital / BAMCO) added2026-02-17
    +150,000 shares · 2025Q4
    13F
  2. AQR Capital Management trimmed2026-02-17
    −14,619 shares · 2025Q4
    13F
  3. D.E. Shaw & Co. trimmed2026-02-17
    −610,386 shares · 2025Q4
    13F
  4. Two Sigma Investments exited2026-02-17
    −298,500 shares · 2025Q4
    13F
  5. Izzy Englander (Millennium Mgmt) exited2026-02-17
    −521,021 shares · 2025Q4
    13F
  6. Steve Cohen (Point72) opened position2026-02-17
    +20,900 shares · 2025Q4
    13F
  7. Wellington Management opened position2026-02-17
    +248,775 shares · 2025Q4
    13F
  8. Paul Tudor Jones (Tudor Investment) opened position2026-02-17
    +14,300 shares · 2025Q4
    13F
  9. Ken Griffin (Citadel Advisors) added2026-02-17
    +1,430,949 shares · 2025Q4
    13F
  10. Ray Dalio (Bridgewater Associates) opened position2026-02-13
    +489,928 shares · 2025Q4
    13F
  11. Lee Ainslie (Maverick Capital) exited2026-02-13
    −2,588,579 shares · 2025Q4
    13F
  12. Norges Bank (Norway SWF) opened position2026-02-10
    +92,105 shares · 2025Q4
    13F
  13. Mario Gabelli (GAMCO) added2026-02-05
    +15,310 shares · 2025Q4
    13F
  14. Two Sigma Investments added2025-11-14
    +269,850 shares · 2025Q3
    13F
  15. D.E. Shaw & Co. added2025-11-14
    +272,106 shares · 2025Q3
    13F
  16. Lee Ainslie (Maverick Capital) trimmed2025-11-14
    −2,719,459 shares · 2025Q3
    13F
  17. T. Rowe Price added2025-11-14
    +665,185 shares · 2025Q3
    13F
  18. Leon Cooperman (Omega Family Office) added2025-11-14
    +1,258,441 shares · 2025Q3
    13F
  19. George Soros (Soros Fund Mgmt) exited2025-11-14
    −71,700 shares · 2025Q3
    13F
  20. AQR Capital Management trimmed2025-11-14
    −19,922 shares · 2025Q3
    13F
  21. Izzy Englander (Millennium Mgmt) trimmed2025-11-14
    −2,360,926 shares · 2025Q3
    13F
  22. Ron Baron (Baron Capital / BAMCO) opened position2025-11-14
    +500,000 shares · 2025Q3
    13F
  23. Renaissance Technologies exited2025-11-13
    −115,900 shares · 2025Q3
    13F
  24. Mario Gabelli (GAMCO) trimmed2025-11-12
    −35,455 shares · 2025Q3
    13F

Insider activity

No insider transactions in the last 30 days.
View full insider history for MIR →
Follow-the-investor returns
If you'd copied each holder of MIR…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
InvestorFirst inCost basisReturnPosition value today
T. Rowe Price2022Q2$0.11+17301.4%$16.1M
Mario Gabelli (GAMCO)2021Q4$8.18+135.5%$10.4M
Paul Tudor Jones (Tudor Investment)2021Q3$17.25+11.7%$276K
AQR Capital Management2024Q4$17.88+7.7%$5.4M
Ron Baron (Baron Capital / BAMCO)2021Q4$20.35-5.3%$12.5M
Ray Dalio (Bridgewater Associates)2024Q4$20.45-5.8%$9.4M
D.E. Shaw & Co.2022Q2$22.59-14.7%$12.1M
D.E. Shaw & Co.2022Q2$22.59-14.7%$12.1M
Ken Griffin (Citadel Advisors)2021Q4$23.25-17.1%$1.4M
Ken Griffin (Citadel Advisors)2021Q4$23.25-17.1%$1.4M
Ken Griffin (Citadel Advisors)2021Q4$23.25-17.1%$1.4M
Norges Bank (Norway SWF)2025Q4$23.42-17.7%$1.8M
Steve Cohen (Point72)2025Q4$23.42-17.7%$216K
Steve Cohen (Point72)2025Q4$23.42-17.7%$216K
Wellington Management2025Q4$23.42-17.7%$4.8M
Leon Cooperman (Omega Family Office)2021Q4$1439.88-98.7%$161.5M

Who moved on this name in 2025Q4

13F transactions reported for the latest quarter, grouped by direction.
New positions5
Added to3
Trimmed2
Exited3

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.
QuarterHoldersCombined value
2022Q1
8
$27.79B
2022Q2
9
$30.03B
2022Q3
8
$39.0M
2022Q4
10
$117.2M
2023Q1
8
$150.5M
2023Q2
8
$183.5M
2023Q3
7
$176.7M
2023Q4
7
$250.7M
2024Q1
9
$273.0M
2024Q2
10
$274.2M
2024Q3
10
$117.8M
2024Q4
15
$322.5M
2025Q1
13
$309.4M
2025Q2
16
$406.3M
2025Q3
13
$354.4M
2025Q4
16
$321.4M

Who owns MIR

16 super-investors · 2025Q4
Tracked stake
14.55M
shares
Combined value
$321M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New6Added5Trim3Held2
#ManagerSharesValue
1Leon Cooperman
Omega Family Office
8.38M$196M
2Ken Griffin
Citadel Advisors
1.62M$38M
3Ron Baron
Baron Capital / BAMCO
650.0K$15M
4D.E. Shaw & Co.629.2K$15M
5Mario Gabelli
GAMCO
541.9K$13M
6Ray Dalio
Bridgewater Associates
489.9K$11M
7D.E. Shaw & Co.384.0K$9M
8Ken Griffin
Citadel Advisors
292.7K$7M
9AQR Capital Management277.7K$7M
10Wellington Management248.8K$6M
11Norges Bank
Norway SWF
92.1K$2M
12Ken Griffin
Citadel Advisors
74.6K$2M
13Paul Tudor Jones
Tudor Investment
14.3K$335K
14Steve Cohen
Point72
11.2K$262K
15Steve Cohen
Point72
9.7K$227K
16T. Rowe Price834.3K$20K

Recent moves

20 transactions
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