XT
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XTX Topco’s Mirion Technologies MIR Stock Holding History

XTX Topco’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 		$1.52M Buy
84,878
+47,700
+128% +$885K 0.02% 1381
2026
Q1 		$691K Sell
37,178
-87,842
-70% -$1.98M 0.01% 1735
2025
Q4 		$2.93M Buy
+125,020
New +$3.12M 0.08% 344
2025
Q2 		– Sell
-69,269
Closed -$1M – 2861
2025
Q1 		$1M Buy
69,269
+46,716
+207% +$734K 0.05% 565
2024
Q4 		$394K Sell
22,553
-4,846
-18% -$75.2K 0.03% 978
2024
Q3 		$303K Buy
+27,399
New +$288K 0.02% 1175

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

XTX Topco's MIR Position: Q2 2026 in Review

XTX Topco increased its Mirion Technologies (MIR) stake by 128% in Q2 2026, buying an estimated $885K and bringing the position to 84,878 shares worth $1.52M. The position accounts for 0.02% of the portfolio, ranked #1381.

XTX Topco first reported a position in MIR in Q3 2024 and has held it in 6 quarters since. The position peaked at $2.93M in Q4 2025. 351 funds tracked by Wall St. Rank hold MIR as of Q2 2026.

  • XTX Topco held 84,878 shares of Mirion Technologies worth $1.52M as of Q2 2026.
  • XTX Topco bought 47,700 Mirion Technologies shares in Q2 2026, an estimated $885K.
  • Mirion Technologies made up 0.02% of XTX Topco's portfolio in Q2 2026, its #1381 holding.
  • XTX Topco first reported a position in Mirion Technologies in Q3 2024 and has held it in 6 quarters since.
  • XTX Topco's Mirion Technologies position peaked at $2.93M in Q4 2025.
  • 351 funds tracked by Wall St. Rank held Mirion Technologies as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.