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
2025 Q4	–	Sell	-202,331	Closed	-$5.05M	–	9459
2025 Q3	$4.71M	Buy	202,331 +83,382	+70%	+$1.8M	﹤0.01%	1514
2025 Q2	$2.56M	Buy	118,949 +87,579	+279%	+$1.51M	﹤0.01%	1889
2025 Q1	$454K	Buy	+31,370	New	+$493K	﹤0.01%	3488
2023 Q4	–	Sell	-8,053	Closed	-$68K	–	9421
2023 Q3	$60K	Buy	+8,053	New	+$63.5K	﹤0.01%	5639
2022 Q2	–	Sell	-37,056	Closed	-$273K	–	10650
2022 Q1	$299K	Buy	+37,056	New	+$319K	﹤0.01%	4561
2021 Q4	–	Sell	-127,909	Closed	-$1.37M	–	11025
2021 Q3	$1.32M	Sell	127,909 -2,802	-2%	-$28.3K	﹤0.01%	2709
2021 Q2	$1.36M	Sell	130,711 -284,582	-69%	-$2.93M	﹤0.01%	2692
2021 Q1	$4.33M	Buy	+415,293	New	+$4.88M	0.01%	936

Other funds holding MIR

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 Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

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 New York $871B AUM 31.28% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

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. 366 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.
366 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.