Rossby Financial
MIR icon

Rossby Financial’s Mirion Technologies MIR Stock Holding History

Rossby Financial’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
Q3 		$1.44K Buy
102
+30
+42% +$474 ﹤0.01% 2135
2026
Q2 		$1.29K Sell
72
-24
-25% -$445 ﹤0.01% 1851
2026
Q1 		$1.79K Buy
96
+87
+967% +$1.96K ﹤0.01% 1844
2025
Q4 		$211 Buy
+9
New +$224 ﹤0.01% 1745

Other funds holding MIR

Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return
Congress Asset Management
Congress Asset Management Boston, Massachusetts $15.4B AUM 30.39% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return
Swedbank
Swedbank Stockholm, Sweden $118B AUM 40.52% 1-Year Est. Return
William Blair Investment Management
William Blair Investment Management Chicago, Illinois $30.8B AUM 33.92% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $608B AUM 32.77% 1-Year Est. Return
TimesSquare Capital Management
TimesSquare Capital Management New York $6.12B AUM 30.01% 1-Year Est. Return
Principal Financial Group
Principal Financial Group Des Moines, Iowa $195B AUM 21.17% 1-Year Est. Return
Conestoga Capital Advisors
Conestoga Capital Advisors Wayne, Pennsylvania $3.31B AUM 6.07% 1-Year Est. Return
Deutsche Bank
Deutsche Bank Frankfurt Am Main Ge, Germany $362B AUM 34.89% 1-Year Est. Return

Rossby Financial's MIR Position: Q3 2026 in Review

Rossby Financial increased its Mirion Technologies (MIR) stake by 42% in Q3 2026, buying an estimated $474 and bringing the position to 102 shares worth $1.44K. The position accounts for ﹤0.01% of the portfolio, ranked #2135.

Rossby Financial first reported a position in MIR in Q4 2025 and has held it in 4 quarters since. The position peaked at $1.79K in Q1 2026. 156 funds tracked by Wall St. Rank hold MIR as of Q3 2026.

  • Rossby Financial held 102 shares of Mirion Technologies worth $1.44K as of Q3 2026.
  • Rossby Financial bought 30 Mirion Technologies shares in Q3 2026, an estimated $474.
  • Mirion Technologies made up ﹤0.01% of Rossby Financial's portfolio in Q3 2026, its #2135 holding.
  • Rossby Financial first reported a position in Mirion Technologies in Q4 2025 and has held it in 4 quarters since.
  • Rossby Financial's Mirion Technologies position peaked at $1.79K in Q1 2026.
  • 156 funds tracked by Wall St. Rank held Mirion Technologies as of Q3 2026.

Based on Rossby Financial's 13F filing for Q3 2026, filed 5 Nov 2026.