California State Teachers Retirement System (CalSTRS)
GBIO

California State Teachers Retirement System (CalSTRS)’s Generation Bio GBIO Stock Holding History

California State Teachers Retirement System (CalSTRS)’s Portfolio GBIO Stock Details GBIO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q2 		– Sell
-359
Closed -$1.45K – 3043
2025
Q1 		$1.45K Hold
359
– – ﹤0.01% 3032
2024
Q4 		$3.8K Hold
359
– – ﹤0.01% 3015
2024
Q3 		$8.86K Hold
359
– – ﹤0.01% 2911
2024
Q2 		$10.1K Sell
359
-96
-21% -$3.12K ﹤0.01% 2898
2024
Q1 		$18.5K Sell
455
-290
-39% -$6.83K ﹤0.01% 2751
2023
Q4 		$12.3K Sell
745
-254
-25% -$4.43K ﹤0.01% 2978
2023
Q3 		$37.9K Sell
999
-507
-34% -$24K ﹤0.01% 2806
2023
Q2 		$82.9K Sell
1,506
-282
-16% -$12.9K ﹤0.01% 2710
2023
Q1 		$76.9K Sell
1,788
-3,974
-69% -$192K ﹤0.01% 2747
2022
Q4 		$226K Buy
5,762
+180
+3% +$9.45K ﹤0.01% 2597
2022
Q3 		$296K Sell
5,582
-59
-1% -$3.69K ﹤0.01% 2536
2022
Q2 		$370K Buy
5,641
+606
+12% +$39.6K ﹤0.01% 2514
2022
Q1 		$370K Sell
5,035
-469
-9% -$27.2K ﹤0.01% 2494
2021
Q4 		$390K Buy
5,504
+126
+2% +$22K ﹤0.01% 2598
2021
Q3 		$1.35M Sell
5,378
-663
-11% -$159K ﹤0.01% 1958
2021
Q2 		$1.63M Sell
6,041
-36
-0.6% -$10.8K ﹤0.01% 1900
2021
Q1 		$1.73M Buy
6,077
+4,219
+227% +$1.35M ﹤0.01% 1834
2020
Q4 		$527K Hold
1,858
– – ﹤0.01% 2401
2020
Q3 		$574K Buy
+1,858
New +$444K ﹤0.01% 2201

Other funds holding GBIO

T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
AVLSA
Atlas Venture Life Science Advisors Cambridge, Massachusetts $790M AUM 223.66% 1-Year Est. Return
SL
Siren LLC Greenwich, Connecticut $4.94B AUM 244.43% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BBA
Baker Bros. Advisors New York $17.4B AUM 131.5% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Goldman Sachs
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

California State Teachers Retirement System (CalSTRS)'s GBIO Position: Q2 2025 in Review

California State Teachers Retirement System (CalSTRS) sold out of Generation Bio (GBIO) in Q2 2025, closing a stake of 359 shares — an estimated $1.45K sold.

California State Teachers Retirement System (CalSTRS) first reported a position in GBIO in Q3 2020 and held it in 19 quarters. The position peaked at $1.73M in Q1 2021. 61 funds tracked by Wall St. Rank hold GBIO as of Q2 2025.

  • California State Teachers Retirement System (CalSTRS) reported no remaining Generation Bio position as of Q2 2025 after selling out during the quarter.
  • California State Teachers Retirement System (CalSTRS) sold 359 Generation Bio shares in Q2 2025, an estimated $1.45K.
  • California State Teachers Retirement System (CalSTRS) first reported a position in Generation Bio in Q3 2020 and held it in 19 quarters.
  • California State Teachers Retirement System (CalSTRS)'s Generation Bio position peaked at $1.73M in Q1 2021.
  • 61 funds tracked by Wall St. Rank held Generation Bio as of Q2 2025.

Based on California State Teachers Retirement System (CalSTRS)'s 13F filing for Q2 2025, filed 14 Aug 2025.