Simplex Trading
MIR icon

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 		$81.8K Sell
4,400
-5,700
-56% -$129K ﹤0.01% 5320
2025
Q4 		$237K Sell
10,100
-156,600
-94% -$3.91M ﹤0.01% 4052
2025
Q3 		$3.88M Sell
166,700
-298,600
-64% -$6.45M ﹤0.01% 1699
2025
Q2 		$10M Buy
465,300
+464,900
+116,225% +$8.01M 0.01% 893
2025
Q1 		$5K Sell
400
-1,300
-76% -$20.4K ﹤0.01% 7564
2024
Q4 		$29K Sell
1,700
-1,700
-50% -$26.4K ﹤0.01% 6392
2024
Q3 		$37K Sell
3,400
-6,400
-65% -$67.3K ﹤0.01% 6162
2024
Q2 		$105K Buy
9,800
+4,500
+85% +$47.8K ﹤0.01% 5329
2024
Q1 		$60K Sell
5,300
-89,300
-94% -$894K ﹤0.01% 6101
2023
Q4 		$969K Buy
94,600
+14,500
+18% +$122K ﹤0.01% 3027
2023
Q3 		$598K Buy
80,100
+79,600
+15,920% +$627K ﹤0.01% 3214
2023
Q2 		$4K Hold
500
– – ﹤0.01% 8060
2023
Q1 		$4K Hold
500
– – ﹤0.01% 8191
2022
Q4 		$3K Hold
500
– – ﹤0.01% 8396
2022
Q3 		$3K Sell
500
-7,500
-94% -$52.8K ﹤0.01% 9114
2022
Q2 		$46K Sell
8,000
-34,200
-81% -$252K ﹤0.01% 6612
2022
Q1 		$340K Buy
42,200
+2,900
+7% +$25K ﹤0.01% 4365
2021
Q4 		$411K Sell
39,300
-443,200
-92% -$4.76M ﹤0.01% 4083
2021
Q3 		$154K Buy
482,500
+1,000
+0.2% +$10.1K ﹤0.01% 6003
2021
Q2 		$5.01M Buy
481,500
+474,376
+6,659% +$4.88M ﹤0.01% 1190
2021
Q1 		$7.43M Buy
+7,124
New +$83.7K 0.01% 580

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.