Jim Simons
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Jim Simons’s Mirion Technologies MIR Stock Holding History

Jim Simons’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
Q3 		– Sell
-115,900
Closed -$2.5M – 3751
2025
Q2 		$2.5M Sell
115,900
-527,800
-82% -$9.1M ﹤0.01% 1977
2025
Q1 		$9.33M Buy
643,700
+498,686
+344% +$7.84M 0.01% 1037
2024
Q4 		$2.53M Buy
145,014
+32,014
+28% +$497K ﹤0.01% 1900
2024
Q3 		$1.25M Sell
113,000
-61,000
-35% -$642K ﹤0.01% 2312
2024
Q2 		$1.87M Sell
174,000
-128,500
-42% -$1.37M ﹤0.01% 1918
2024
Q1 		$3.44M Buy
+302,500
New +$3.03M 0.01% 1661
2023
Q3 		– Sell
-258,496
Closed -$2.18M – 3931
2023
Q2 		$2.18M Buy
258,496
+124,396
+93% +$1.01M ﹤0.01% 1938
2023
Q1 		$1.15M Buy
134,100
+54,800
+69% +$435K ﹤0.01% 2387
2022
Q4 		$524K Buy
+79,300
New +$534K ﹤0.01% 2928

Other funds holding MIR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
CLG
Cooperman Leon G $3.05B AUM 42.78% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $315B AUM 27.84% 1-Year Est. Return

Jim Simons's MIR Position: Q3 2025 in Review

Jim Simons sold out of Mirion Technologies (MIR) in Q3 2025, closing a stake of 115,900 shares — an estimated $2.5M sold.

Jim Simons first reported a position in MIR in Q4 2022 and held it in 9 quarters. The position peaked at $9.33M in Q1 2025. 342 funds tracked by Wall St. Rank hold MIR as of Q3 2025.

  • Jim Simons reported no remaining Mirion Technologies position as of Q3 2025 after selling out during the quarter.
  • Jim Simons sold 115,900 Mirion Technologies shares in Q3 2025, an estimated $2.5M.
  • Jim Simons first reported a position in Mirion Technologies in Q4 2022 and held it in 9 quarters.
  • Jim Simons's Mirion Technologies position peaked at $9.33M in Q1 2025.
  • 342 funds tracked by Wall St. Rank held Mirion Technologies as of Q3 2025.

Based on Renaissance Technologies's 13F filing for Q3 2025, filed 13 Nov 2025.