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	–	Sell	-18,600	Closed	-$436K	–	12442
2025 Q4	$436K	Sell	18,600 -30,900	-62%	-$771K	﹤0.01%	8012
2025 Q3	$1.15M	Sell	49,500 -48,100	-49%	-$1.04M	﹤0.01%	6001
2025 Q2	$2.1M	Buy	+97,600	New	+$1.68M	﹤0.01%	4336
2024 Q1	–	Sell	-10,200	Closed	-$105K	–	9742
2023 Q4	$105K	Buy	+10,200	New	+$86.1K	﹤0.01%	8560
2022 Q1	–	Sell	-31,700	Closed	-$332K	–	10748
2021 Q4	$332K	Sell	31,700 -289,300	-90%	-$3.11M	﹤0.01%	7985
2021 Q3	$3.28M	Sell	321,000 -1,224,100	-79%	-$12.4M	﹤0.01%	3492
2021 Q2	$16.1M	Buy	1,545,100 +204,700	+15%	+$2.11M	0.01%	1268
2021 Q1	$14M	Buy	+1,340,400	New	+$15.7M	0.01%	1261

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

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.