GI
MIR icon

GAMCO Investors’s Mirion Technologies MIR Stock Holding History

GAMCO 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
2026
Q2 		$9.6M Sell
535,270
-9,392
-2% -$174K 0.09% 243
2026
Q1 		$10.1M Buy
544,662
+2,733
+0.5% +$61.6K 0.1% 234
2025
Q4 		$12.7M Buy
541,929
+15,310
+3% +$382K 0.12% 209
2025
Q3 		$12.2M Sell
526,619
-35,455
-6% -$766K 0.12% 211
2025
Q2 		$12.1M Sell
562,074
-30,053
-5% -$518K 0.12% 201
2025
Q1 		$8.59M Sell
592,127
-7,507
-1% -$118K 0.09% 237
2024
Q4 		$10.5M Sell
599,634
-35,136
-6% -$545K 0.11% 223
2024
Q3 		$7.03M Sell
634,770
-100,875
-14% -$1.06M 0.07% 286
2024
Q2 		$7.9M Sell
735,645
-33,000
-4% -$351K 0.09% 258
2024
Q1 		$8.74M Sell
768,645
-11,200
-1% -$112K 0.09% 251
2023
Q4 		$7.99M Sell
779,845
-16,450
-2% -$139K 0.09% 257
2023
Q3 		$5.95M Buy
796,295
+566,070
+246% +$4.46M 0.07% 290
2023
Q2 		$1.95M Buy
230,225
+10,225
+5% +$83K 0.02% 485
2023
Q1 		$1.88M Buy
220,000
+16,000
+8% +$127K 0.02% 481
2022
Q4 		$1.35M Sell
204,000
-3,000
-1% -$20.2K 0.01% 537
2022
Q3 		$1.55M Buy
207,000
+37,854
+22% +$267K 0.02% 513
2022
Q2 		$974K Buy
169,146
+2,300
+1% +$16.9K 0.01% 589
2022
Q1 		$1.35M Buy
166,846
+9,646
+6% +$83.1K 0.01% 564
2021
Q4 		$1.65M Buy
157,200
+57,200
+57% +$614K 0.01% 539
2021
Q3 		$1.02M Buy
+100,000
New +$1.01M 0.01% 622

Other funds holding MIR

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Goldman Sachs
Goldman Sachs New York $1.15T AUM 47.82% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Alyeska Investment Group
Alyeska Investment Group Chicago, Illinois $38.9B AUM 28.51% 1-Year Est. Return
CLG
Cooperman Leon G $3.55B AUM 41.85% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
CAM
Congress Asset Management Boston, Massachusetts $16.3B AUM 42.69% 1-Year Est. Return

GAMCO Investors's MIR Position: Q2 2026 in Review

GAMCO Investors reduced its Mirion Technologies (MIR) stake by 1.7% in Q2 2026, selling an estimated $174K and leaving 535,270 shares worth $9.6M. The position accounts for 0.09% of the portfolio, ranked #243.

GAMCO Investors first reported a position in MIR in Q3 2021 and has held it in 20 quarters since. The position peaked at $12.7M in Q4 2025. 351 funds tracked by Wall St. Rank hold MIR as of Q2 2026.

  • GAMCO Investors held 535,270 shares of Mirion Technologies worth $9.6M as of Q2 2026.
  • GAMCO Investors sold 9,392 Mirion Technologies shares in Q2 2026, an estimated $174K.
  • Mirion Technologies made up 0.09% of GAMCO Investors's portfolio in Q2 2026, its #243 holding.
  • GAMCO Investors first reported a position in Mirion Technologies in Q3 2021 and has held it in 20 quarters since.
  • GAMCO Investors's Mirion Technologies position peaked at $12.7M in Q4 2025.
  • 351 funds tracked by Wall St. Rank held Mirion Technologies as of Q2 2026.

Based on GAMCO Investors's 13F filing for Q2 2026, filed 12 Aug 2026.