Simplex Trading
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Simplex Trading’s Mirion Technologies MIR Stock Holding History

Simplex Trading’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 		$2.29M Sell
123,000
-21,000
-15% -$474K ﹤0.01% 1718
2025
Q4 		$3.37M Buy
144,000
+45,800
+47% +$1.14M ﹤0.01% 1573
2025
Q3 		$2.28M Buy
98,200
+4,100
+4% +$88.6K ﹤0.01% 2185
2025
Q2 		$2.02M Buy
94,100
+12,200
+15% +$210K ﹤0.01% 2096
2025
Q1 		$1.19M Sell
81,900
-165,800
-67% -$2.61M ﹤0.01% 2536
2024
Q4 		$4.32M Buy
247,700
+247,300
+61,825% +$3.84M ﹤0.01% 1590
2024
Q3 		$4K Sell
400
-31,500
-99% -$331K ﹤0.01% 7741
2024
Q2 		$342K Sell
31,900
-45,600
-59% -$485K ﹤0.01% 4082
2024
Q1 		$881K Sell
77,500
-100,300
-56% -$1M ﹤0.01% 3250
2023
Q4 		$1.82M Sell
177,800
-86,100
-33% -$727K ﹤0.01% 2443
2023
Q3 		$1.97M Buy
263,900
+142,900
+118% +$1.13M ﹤0.01% 2083
2023
Q2 		$1.02M Sell
121,000
-31,600
-21% -$256K ﹤0.01% 2576
2023
Q1 		$1.3M Buy
152,600
+53,300
+54% +$423K ﹤0.01% 2341
2022
Q4 		$656K Sell
99,300
-26,300
-21% -$177K ﹤0.01% 2903
2022
Q3 		$938K Buy
125,600
+57,700
+85% +$406K ﹤0.01% 2720
2022
Q2 		$391K Sell
67,900
-55,700
-45% -$410K ﹤0.01% 3757
2022
Q1 		$997K Sell
123,600
-34,100
-22% -$294K ﹤0.01% 2927
2021
Q4 		$1.65M Sell
157,700
-221,600
-58% -$2.38M ﹤0.01% 2237
2021
Q3 		$162K Hold
379,300
– – ﹤0.01% 5935
2021
Q2 		$3.94M Buy
379,300
+375,900
+11,056% +$3.87M ﹤0.01% 1406
2021
Q1 		$3.55M Buy
+3,400
New +$39.9K 0.01% 1099

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

Simplex Trading's MIR Position: Q4 2025 in Review

Simplex Trading sold out of Mirion Technologies (MIR) in Q4 2025, closing a stake of 202,331 shares — an estimated $5.05M sold.

Simplex Trading first reported a position in MIR in Q1 2021 and held it in 8 quarters. The position peaked at $4.71M in Q3 2025. 365 funds tracked by Wall St. Rank hold MIR as of Q4 2025.

  • Simplex Trading reported no remaining Mirion Technologies position as of Q4 2025 after selling out during the quarter.
  • Simplex Trading sold 202,331 Mirion Technologies shares in Q4 2025, an estimated $5.05M.
  • Simplex Trading first reported a position in Mirion Technologies in Q1 2021 and held it in 8 quarters.
  • Simplex Trading's Mirion Technologies position peaked at $4.71M in Q3 2025.
  • 365 funds tracked by Wall St. Rank held Mirion Technologies as of Q4 2025.

Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.