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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
2025
Q2 		– Sell
-345,000
Closed -$5M – 286
2025
Q1 		$5M Sell
345,000
-50,000
-13% -$786K 0.09% 85
2024
Q4 		$6.89M Buy
+395,000
New +$6.13M 0.12% 56

Other funds holding MIR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Alyeska Investment Group
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
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.