Castleark Management’s Mirion Technologies MIR Stock Holding History

Castleark Management’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	-348,130	Closed	-$8.15M	–	324
2025 Q4	$8.15M	Buy	+348,130	New	+$8.68M	0.24%	91

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

Castleark Management's MIR Position: Q1 2026 in Review

Castleark Management sold out of Mirion Technologies (MIR) in Q1 2026, closing a stake of 348,130 shares — an estimated $8.15M sold.

Castleark Management first reported a position in MIR in Q4 2025 and held it in 1 quarter. The position peaked at $8.15M in Q4 2025. 360 funds tracked by Wall St. Rank hold MIR as of Q1 2026.

Castleark Management reported no remaining Mirion Technologies position as of Q1 2026 after selling out during the quarter.
Castleark Management sold 348,130 Mirion Technologies shares in Q1 2026, an estimated $8.15M.
Castleark Management first reported a position in Mirion Technologies in Q4 2025 and held it in 1 quarter.
Castleark Management's Mirion Technologies position peaked at $8.15M in Q4 2025.
360 funds tracked by Wall St. Rank held Mirion Technologies as of Q1 2026.

Based on Castleark Management's 13F filing for Q1 2026, filed 15 May 2026.