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CSS LLC’s Mirion Technologies MIR Stock Holding History

CSS LLC’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
2024
Q1 		– Sell
-20,000
Closed -$205K – 895
2023
Q4 		$205K Sell
20,000
-10,000
-33% -$84.4K 0.01% 625
2023
Q3 		$224K Buy
+30,000
New +$236K 0.01% 585
2022
Q4 		– Sell
-20,400
Closed -$152K – 1043
2022
Q3 		$152K Buy
+20,400
New +$144K 0.01% 784

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
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
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
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Massachusetts Financial Services
Massachusetts Financial Services Boston, Massachusetts $298B AUM 21.96% 1-Year Est. Return

CSS LLC's MIR Position: Q3 2025 in Review

CSS LLC sold out of Mirion Technologies (MIR) in Q3 2025, closing a stake of 28,070 shares — an estimated $604K sold.

CSS LLC first reported a position in MIR in Q4 2020 and held it in 2 quarters. The position peaked at $604K in Q2 2025. 341 funds tracked by Wall St. Rank hold MIR as of Q3 2025.

  • CSS LLC reported no remaining Mirion Technologies position as of Q3 2025 after selling out during the quarter.
  • CSS LLC sold 28,070 Mirion Technologies shares in Q3 2025, an estimated $604K.
  • CSS LLC first reported a position in Mirion Technologies in Q4 2020 and held it in 2 quarters.
  • CSS LLC's Mirion Technologies position peaked at $604K in Q2 2025.
  • 341 funds tracked by Wall St. Rank held Mirion Technologies as of Q3 2025.

Based on CSS LLC's 13F filing for Q3 2025, filed 13 Nov 2025.