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
2026
Q1 		$2.9M Sell
155,900
-202,800
-57% -$4.57M ﹤0.01% 4408
2025
Q4 		$8.4M Buy
358,700
+207,600
+137% +$5.18M ﹤0.01% 2538
2025
Q3 		$3.51M Buy
151,100
+108,200
+252% +$2.34M ﹤0.01% 3967
2025
Q2 		$924K Buy
42,900
+24,600
+134% +$424K ﹤0.01% 5763
2025
Q1 		$265K Sell
18,300
-65,300
-78% -$1.03M ﹤0.01% 8009
2024
Q4 		$1.46M Buy
83,600
+71,900
+615% +$1.12M ﹤0.01% 4696
2024
Q3 		$130K Buy
+11,700
New +$123K ﹤0.01% 8882
2024
Q2 		– Sell
-109,400
Closed -$1.24M – 9879
2024
Q1 		$1.24M Sell
109,400
-25,200
-19% -$252K ﹤0.01% 5012
2023
Q4 		$1.38M Buy
134,600
+113,200
+529% +$955K ﹤0.01% 4977
2023
Q3 		$160K Sell
21,400
-8,500
-28% -$67K ﹤0.01% 7749
2023
Q2 		$253K Sell
29,900
-15,500
-34% -$126K ﹤0.01% 7374
2023
Q1 		$388K Sell
45,400
-46,600
-51% -$370K ﹤0.01% 6765
2022
Q4 		$608K Sell
92,000
-84,800
-48% -$571K ﹤0.01% 5792
2022
Q3 		$1.32M Buy
176,800
+86,400
+96% +$608K ﹤0.01% 4923
2022
Q2 		$521K Sell
90,400
-213,000
-70% -$1.57M ﹤0.01% 6662
2022
Q1 		$2.45M Sell
303,400
-218,700
-42% -$1.88M ﹤0.01% 4350
2021
Q4 		$5.47M Buy
522,100
+267,300
+105% +$2.87M ﹤0.01% 2716
2021
Q3 		$2.6M Sell
254,800
-105,100
-29% -$1.06M ﹤0.01% 3940
2021
Q2 		$3.74M Sell
359,900
-421,800
-54% -$4.34M ﹤0.01% 3159
2021
Q1 		$8.15M Buy
+781,700
New +$9.18M ﹤0.01% 1757

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.