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 Q2	$57M	Buy	3,176,241 +443,479	+16%	+$8.22M	0.03%	797
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 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

American Century Companies's MIR Position: Q2 2026 in Review

American Century Companies increased its Mirion Technologies (MIR) stake by 16% in Q2 2026, buying an estimated $8.22M and bringing the position to 3,176,241 shares worth $57M. The position accounts for 0.03% of the portfolio, ranked #797.

American Century Companies first reported a position in MIR in Q2 2023 and has held it in 13 quarters since. The position peaked at $75.1M in Q3 2025. 352 funds tracked by Wall St. Rank hold MIR as of Q2 2026.

American Century Companies held 3,176,241 shares of Mirion Technologies worth $57M as of Q2 2026.
American Century Companies bought 443,479 Mirion Technologies shares in Q2 2026, an estimated $8.22M.
Mirion Technologies made up 0.03% of American Century Companies's portfolio in Q2 2026, its #797 holding.
American Century Companies first reported a position in Mirion Technologies in Q2 2023 and has held it in 13 quarters since.
American Century Companies's Mirion Technologies position peaked at $75.1M in Q3 2025.
352 funds tracked by Wall St. Rank held Mirion Technologies as of Q2 2026.

Based on American Century Companies's 13F filing for Q2 2026, filed 12 Aug 2026.