American Century Companies
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American Century Companies’s Mirion Technologies MIR Stock Holding History

American Century Companies’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 		$50.8M Buy
2,732,762
+176,038
+7% +$3.97M 0.03% 750
2025
Q4 		$59.9M Sell
2,556,724
-672,814
-21% -$16.8M 0.03% 645
2025
Q3 		$75.1M Sell
3,229,538
-143,814
-4% -$3.11M 0.04% 525
2025
Q2 		$72.6M Sell
3,373,352
-59,462
-2% -$1.03M 0.04% 503
2025
Q1 		$49.8M Buy
3,432,814
+1,047,781
+44% +$16.5M 0.03% 615
2024
Q4 		$41.6M Sell
2,385,033
-1,427,563
-37% -$22.1M 0.02% 710
2024
Q3 		$42.2M Sell
3,812,596
-129,975
-3% -$1.37M 0.02% 676
2024
Q2 		$42.3M Buy
3,942,571
+1,507,101
+62% +$16M 0.03% 638
2024
Q1 		$27.7M Buy
2,435,470
+441,336
+22% +$4.42M 0.02% 800
2023
Q4 		$20.4M Buy
1,994,134
+136,230
+7% +$1.15M 0.01% 865
2023
Q3 		$13.9M Buy
1,857,904
+488,171
+36% +$3.85M 0.01% 947
2023
Q2 		$11.6M Buy
+1,369,733
New +$11.1M 0.01% 992

Other funds holding MIR

BlackRock
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
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
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
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

American Century Companies's MIR Position: Q1 2026 in Review

American Century Companies increased its Mirion Technologies (MIR) stake by 6.9% in Q1 2026, buying an estimated $3.97M and bringing the position to 2,732,762 shares worth $50.8M. The position accounts for 0.03% of the portfolio, ranked #750.

American Century Companies first reported a position in MIR in Q2 2023 and has held it in 12 quarters since. The position peaked at $75.1M in Q3 2025. 360 funds tracked by Wall St. Rank hold MIR as of Q1 2026.

  • American Century Companies held 2,732,762 shares of Mirion Technologies worth $50.8M as of Q1 2026.
  • American Century Companies bought 176,038 Mirion Technologies shares in Q1 2026, an estimated $3.97M.
  • Mirion Technologies made up 0.03% of American Century Companies's portfolio in Q1 2026, its #750 holding.
  • American Century Companies first reported a position in Mirion Technologies in Q2 2023 and has held it in 12 quarters since.
  • American Century Companies's Mirion Technologies position peaked at $75.1M in Q3 2025.
  • 360 funds tracked by Wall St. Rank held Mirion Technologies as of Q1 2026.

Based on American Century Companies's 13F filing for Q1 2026, filed 15 May 2026.