Lee Ainslie’s Mirion Technologies MIR Stock Holding History

Lee Ainslie’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 Q2	$94M	Buy	5,245,039 +2,595,160	+98%	+$48.1M	0.83%	38
2026 Q1	$49.3M	Buy	+2,649,879	New	+$59.8M	0.57%	43
2025 Q4	–	Sell	-2,588,579	Closed	-$60.2M	–	232
2025 Q3	$60.2M	Sell	2,588,579 -2,719,459	-51%	-$58.8M	0.8%	37
2025 Q2	$114M	Sell	5,308,038 -2,748,071	-34%	-$47.4M	1.72%	20
2025 Q1	$117M	Buy	8,056,109 +1,878,498	+30%	+$29.5M	2.06%	14
2024 Q4	$108M	Buy	6,177,611 +5,994,184	+3,268%	+$93M	1.94%	19
2024 Q3	$2.03M	Buy	183,427 +23,616	+15%	+$248K	0.04%	123
2024 Q2	$1.72M	Buy	159,811 +119,037	+292%	+$1.27M	0.03%	133
2024 Q1	$464K	Buy	+40,774	New	+$408K	0.01%	237

Other funds holding MIR

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Alyeska Investment Group Chicago, Illinois $38.9B AUM 28.51% 1-Year Est. Return

CLG

Cooperman Leon G $3.55B AUM 41.85% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

CAM

Congress Asset Management Boston, Massachusetts $16.3B AUM 42.69% 1-Year Est. Return

Lee Ainslie's MIR Position: Q2 2026 in Review

Lee Ainslie increased its Mirion Technologies (MIR) stake by 98% in Q2 2026, buying an estimated $48.1M and bringing the position to 5,245,039 shares worth $94M. The position accounts for 0.83% of the portfolio, ranked #38.

Lee Ainslie first reported a position in MIR in Q1 2024 and has held it in 9 quarters since. The position peaked at $117M in Q1 2025. 349 funds tracked by Wall St. Rank hold MIR as of Q2 2026.

Lee Ainslie held 5,245,039 shares of Mirion Technologies worth $94M as of Q2 2026.
Lee Ainslie bought 2,595,160 Mirion Technologies shares in Q2 2026, an estimated $48.1M.
Mirion Technologies made up 0.83% of Lee Ainslie's portfolio in Q2 2026, its #38 holding.
Lee Ainslie first reported a position in Mirion Technologies in Q1 2024 and has held it in 9 quarters since.
Lee Ainslie's Mirion Technologies position peaked at $117M in Q1 2025.
349 funds tracked by Wall St. Rank held Mirion Technologies as of Q2 2026.

Based on Maverick Capital's 13F filing for Q2 2026, filed 14 Aug 2026.