Jane Street
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Jane Street’s Mirion Technologies MIR Stock Holding History

Jane Street’s Portfolio MIR Stock Details MIR Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-55,760
Closed -$1.39M – 11897
2025
Q3 		$1.3M Sell
55,760
-185,784
-77% -$4.02M ﹤0.01% 5776
2025
Q2 		$5.2M Sell
241,544
-86,640
-26% -$1.49M ﹤0.01% 2940
2025
Q1 		$4.76M Buy
328,184
+307,505
+1,487% +$4.83M ﹤0.01% 3008
2024
Q4 		$361K Sell
20,679
-102,961
-83% -$1.6M ﹤0.01% 7413
2024
Q3 		$1.37M Sell
123,640
-311,664
-72% -$3.28M ﹤0.01% 5243
2024
Q2 		$4.68M Buy
435,304
+412,881
+1,841% +$4.39M ﹤0.01% 3062
2024
Q1 		$255K Sell
22,423
-170,890
-88% -$1.71M ﹤0.01% 7805
2023
Q4 		$1.98M Buy
193,313
+164,793
+578% +$1.39M ﹤0.01% 4334
2023
Q3 		$213K Sell
28,520
-14,767
-34% -$116K ﹤0.01% 7539
2023
Q2 		$366K Buy
43,287
+17,438
+67% +$142K ﹤0.01% 6816
2023
Q1 		$221K Sell
25,849
-13,685
-35% -$109K ﹤0.01% 7704
2022
Q4 		$261K Sell
39,534
-15,521
-28% -$104K ﹤0.01% 7253
2022
Q3 		$411K Sell
55,055
-6,718
-11% -$47.3K ﹤0.01% 7039
2022
Q2 		$356K Sell
61,773
-200,172
-76% -$1.47M ﹤0.01% 7323
2022
Q1 		$2.11M Buy
+261,945
New +$2.26M ﹤0.01% 4656
2021
Q4 		– Sell
-92,129
Closed -$989K – 10544
2021
Q3 		$942K Sell
92,129
-1,111,865
-92% -$11.2M ﹤0.01% 6028
2021
Q2 		$12.5M Buy
1,203,994
+316,588
+36% +$3.26M ﹤0.01% 1477
2021
Q1 		$9.26M Buy
+887,406
New +$10.4M ﹤0.01% 1629

Other funds holding MIR

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
CLG
Cooperman Leon G $3.05B AUM 42.78% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

Jane Street's MIR Position: Q4 2025 in Review

Jane Street sold out of Mirion Technologies (MIR) in Q4 2025, closing a stake of 55,760 shares — an estimated $1.39M sold.

Jane Street first reported a position in MIR in Q1 2021 and held it in 18 quarters. The position peaked at $12.5M in Q2 2021. 365 funds tracked by Wall St. Rank hold MIR as of Q4 2025.

  • Jane Street reported no remaining Mirion Technologies position as of Q4 2025 after selling out during the quarter.
  • Jane Street sold 55,760 Mirion Technologies shares in Q4 2025, an estimated $1.39M.
  • Jane Street first reported a position in Mirion Technologies in Q1 2021 and held it in 18 quarters.
  • Jane Street's Mirion Technologies position peaked at $12.5M in Q2 2021.
  • 365 funds tracked by Wall St. Rank held Mirion Technologies as of Q4 2025.

Based on Jane Street's 13F filing for Q4 2025, filed 12 Feb 2026.