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Keystone Investors’s Mirion Technologies MIR Stock Holding History

Keystone Investors’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
Q4 		$7.26M Sell
309,887
-571,706
-65% -$14.3M 0.65% 34
2025
Q3 		$20.5M Buy
+881,593
New +$19.1M 2.37% 14

Other funds holding MIR

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
CLG
Cooperman Leon G $3.05B AUM 42.78% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return

Keystone Investors's MIR Position: Q4 2025 in Review

Keystone Investors reduced its Mirion Technologies (MIR) stake by 65% in Q4 2025, selling an estimated $14.3M and leaving 309,887 shares worth $7.26M. The position accounts for 0.65% of the portfolio, ranked #34.

Keystone Investors first reported a position in MIR in Q3 2025 and has held it in 2 quarters since. The position peaked at $20.5M in Q3 2025. 366 funds tracked by Wall St. Rank hold MIR as of Q4 2025.

  • Keystone Investors held 309,887 shares of Mirion Technologies worth $7.26M as of Q4 2025.
  • Keystone Investors sold 571,706 Mirion Technologies shares in Q4 2025, an estimated $14.3M.
  • Mirion Technologies made up 0.65% of Keystone Investors's portfolio in Q4 2025, its #34 holding.
  • Keystone Investors first reported a position in Mirion Technologies in Q3 2025 and has held it in 2 quarters since.
  • Keystone Investors's Mirion Technologies position peaked at $20.5M in Q3 2025.
  • 366 funds tracked by Wall St. Rank held Mirion Technologies as of Q4 2025.

Based on Keystone Investors's 13F filing for Q4 2025, filed 13 Feb 2026.