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Monashee Investment Management’s Mirion Technologies MIR Stock Holding History

Monashee Investment Management’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 		– Sell
-100,000
Closed -$2.33M – 51
2025
Q3 		$2.33M Buy
+100,000
New +$2.16M 1.16% 34
2021
Q1 		– Sell
-200,000
Closed -$2.18M – 408
2020
Q4 		$2.18M Sell
200,000
-149,992
-43% -$1.55M 0.29% 90
2020
Q3 		$3.77M Buy
+349,992
New +$3.63M 0.81% 24

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

Monashee Investment Management's MIR Position: Q4 2025 in Review

Monashee Investment Management sold out of Mirion Technologies (MIR) in Q4 2025, closing a stake of 100,000 shares — an estimated $2.33M sold.

Monashee Investment Management first reported a position in MIR in Q3 2020 and held it in 3 quarters. The position peaked at $3.77M in Q3 2020. 365 funds tracked by Wall St. Rank hold MIR as of Q4 2025.

  • Monashee Investment Management reported no remaining Mirion Technologies position as of Q4 2025 after selling out during the quarter.
  • Monashee Investment Management sold 100,000 Mirion Technologies shares in Q4 2025, an estimated $2.33M.
  • Monashee Investment Management first reported a position in Mirion Technologies in Q3 2020 and held it in 3 quarters.
  • Monashee Investment Management's Mirion Technologies position peaked at $3.77M in Q3 2020.
  • 365 funds tracked by Wall St. Rank held Mirion Technologies as of Q4 2025.

Based on Monashee Investment Management's 13F filing for Q4 2025, filed 12 Feb 2026.