California State Teachers Retirement System (CalSTRS)
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California State Teachers Retirement System (CalSTRS)’s Mirion Technologies MIR Stock Holding History

California State Teachers Retirement System (CalSTRS)’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 		$5.1M Buy
274,096
+49,751
+22% +$1.12M 0.01% 1003
2025
Q4 		$5.25M Buy
224,345
+26,376
+13% +$658K 0.01% 902
2025
Q3 		$4.6M Sell
197,969
-5,433
-3% -$117K ﹤0.01% 975
2025
Q2 		$4.38M Buy
203,402
+25,999
+15% +$448K ﹤0.01% 965
2025
Q1 		$2.57M Sell
177,403
-2,844
-2% -$44.7K ﹤0.01% 1204
2024
Q4 		$3.15M Sell
180,247
-1,994
-1% -$30.9K ﹤0.01% 1134
2024
Q3 		$2.02M Buy
182,241
+9,804
+6% +$103K ﹤0.01% 1405
2024
Q2 		$1.85M Sell
172,437
-4,559
-3% -$48.5K ﹤0.01% 1417
2024
Q1 		$2.01M Sell
176,996
-11,218
-6% -$112K ﹤0.01% 1406
2023
Q4 		$1.93M Sell
188,214
-10,073
-5% -$85K ﹤0.01% 1458
2023
Q3 		$1.48M Sell
198,287
-11,918
-6% -$93.9K ﹤0.01% 1568
2023
Q2 		$1.78M Buy
210,205
+45,002
+27% +$365K ﹤0.01% 1564
2023
Q1 		$1.41M Sell
165,203
-2,488
-1% -$19.7K ﹤0.01% 1692
2022
Q4 		$1.11M Buy
167,691
+1,966
+1% +$13.2K ﹤0.01% 1834
2022
Q3 		$1.24M Sell
165,725
-3,319
-2% -$23.4K ﹤0.01% 1749
2022
Q2 		$974K Buy
+169,044
New +$1.24M ﹤0.01% 1981

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

California State Teachers Retirement System (CalSTRS)'s MIR Position: Q1 2026 in Review

California State Teachers Retirement System (CalSTRS) increased its Mirion Technologies (MIR) stake by 22% in Q1 2026, buying an estimated $1.12M and bringing the position to 274,096 shares worth $5.1M. The position accounts for 0.01% of the portfolio, ranked #1003.

California State Teachers Retirement System (CalSTRS) first reported a position in MIR in Q2 2022 and has held it in 16 quarters since. The position peaked at $5.25M in Q4 2025. 360 funds tracked by Wall St. Rank hold MIR as of Q1 2026.

  • California State Teachers Retirement System (CalSTRS) held 274,096 shares of Mirion Technologies worth $5.1M as of Q1 2026.
  • California State Teachers Retirement System (CalSTRS) bought 49,751 Mirion Technologies shares in Q1 2026, an estimated $1.12M.
  • Mirion Technologies made up 0.01% of California State Teachers Retirement System (CalSTRS)'s portfolio in Q1 2026, its #1003 holding.
  • California State Teachers Retirement System (CalSTRS) first reported a position in Mirion Technologies in Q2 2022 and has held it in 16 quarters since.
  • California State Teachers Retirement System (CalSTRS)'s Mirion Technologies position peaked at $5.25M in Q4 2025.
  • 360 funds tracked by Wall St. Rank held Mirion Technologies as of Q1 2026.

Based on California State Teachers Retirement System (CalSTRS)'s 13F filing for Q1 2026, filed 18 May 2026.