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Shannon River Fund Management’s Mirion Technologies MIR Stock Holding History

Shannon River Fund 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
Q3 		– Sell
-555,377
Closed -$12M – 25
2025
Q2 		$12M Buy
+555,377
New +$9.57M 1.59% 19

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

Shannon River Fund Management's MIR Position: Q3 2025 in Review

Shannon River Fund Management sold out of Mirion Technologies (MIR) in Q3 2025, closing a stake of 555,377 shares — an estimated $12M sold.

Shannon River Fund Management first reported a position in MIR in Q2 2025 and held it in 1 quarter. The position peaked at $12M in Q2 2025. 341 funds tracked by Wall St. Rank hold MIR as of Q3 2025.

  • Shannon River Fund Management reported no remaining Mirion Technologies position as of Q3 2025 after selling out during the quarter.
  • Shannon River Fund Management sold 555,377 Mirion Technologies shares in Q3 2025, an estimated $12M.
  • Shannon River Fund Management first reported a position in Mirion Technologies in Q2 2025 and held it in 1 quarter.
  • Shannon River Fund Management's Mirion Technologies position peaked at $12M in Q2 2025.
  • 341 funds tracked by Wall St. Rank held Mirion Technologies as of Q3 2025.

Based on Shannon River Fund Management's 13F filing for Q3 2025, filed 13 Nov 2025.