SEI Investments
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SEI Investments’s Mirion Technologies MIR Stock Holding History

SEI Investments’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 		$15.2M Buy
849,475
+391,116
+85% +$7.25M 0.01% 921
2026
Q1 		$8.52M Buy
458,359
+1,847
+0.4% +$41.7K 0.01% 1229
2025
Q4 		$10.7M Buy
456,512
+108,813
+31% +$2.71M 0.01% 1034
2025
Q3 		$8.09M Sell
347,699
-3,340
-1% -$72.2K 0.01% 1104
2025
Q2 		$7.56M Buy
351,039
+157,300
+81% +$2.71M 0.01% 1090
2025
Q1 		$2.81M Buy
193,739
+5,821
+3% +$91.5K ﹤0.01% 1498
2024
Q4 		$3.28M Buy
+187,918
New +$2.91M ﹤0.01% 1475

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

SEI Investments's MIR Position: Q2 2026 in Review

SEI Investments increased its Mirion Technologies (MIR) stake by 85% in Q2 2026, buying an estimated $7.25M and bringing the position to 849,475 shares worth $15.2M. The position accounts for 0.01% of the portfolio, ranked #921.

SEI Investments first reported a position in MIR in Q4 2024 and has held it in 7 quarters since. 351 funds tracked by Wall St. Rank hold MIR as of Q2 2026.

  • SEI Investments held 849,475 shares of Mirion Technologies worth $15.2M as of Q2 2026.
  • SEI Investments bought 391,116 Mirion Technologies shares in Q2 2026, an estimated $7.25M.
  • Mirion Technologies made up 0.01% of SEI Investments's portfolio in Q2 2026, its #921 holding.
  • SEI Investments first reported a position in Mirion Technologies in Q4 2024 and has held it in 7 quarters since.
  • 351 funds tracked by Wall St. Rank held Mirion Technologies as of Q2 2026.

Based on SEI Investments's 13F filing for Q2 2026, filed 14 Aug 2026.