GI
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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
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 $5.72T AUM 30.48% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
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
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return

GAMCO Investors's MIR Position: Q1 2026 in Review

GAMCO Investors increased its Mirion Technologies (MIR) stake by 0.5% in Q1 2026, buying an estimated $61.6K and bringing the position to 544,662 shares worth $10.1M. The position accounts for 0.1% of the portfolio, ranked #234.

GAMCO Investors first reported a position in MIR in Q3 2021 and has held it in 19 quarters since. The position peaked at $12.7M in Q4 2025. 360 funds tracked by Wall St. Rank hold MIR as of Q1 2026.

  • GAMCO Investors held 544,662 shares of Mirion Technologies worth $10.1M as of Q1 2026.
  • GAMCO Investors bought 2,733 Mirion Technologies shares in Q1 2026, an estimated $61.6K.
  • Mirion Technologies made up 0.1% of GAMCO Investors's portfolio in Q1 2026, its #234 holding.
  • GAMCO Investors first reported a position in Mirion Technologies in Q3 2021 and has held it in 19 quarters since.
  • GAMCO Investors's Mirion Technologies position peaked at $12.7M in Q4 2025.
  • 360 funds tracked by Wall St. Rank held Mirion Technologies as of Q1 2026.

Based on GAMCO Investors's 13F filing for Q1 2026, filed 14 May 2026.