California State Teachers Retirement System (CalSTRS)
MRSN

California State Teachers Retirement System (CalSTRS)’s Mersana Therapeutics MRSN Stock Holding History

California State Teachers Retirement System (CalSTRS)’s Portfolio MRSN Stock Details MRSN Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q2 		– Sell
-329
Closed -$2.83K – 3105
2025
Q1 		$2.83K Hold
329
– – ﹤0.01% 2991
2024
Q4 		$11.8K Hold
329
– – ﹤0.01% 2806
2024
Q3 		$15.5K Hold
329
– – ﹤0.01% 2722
2024
Q2 		$16.5K Sell
329
-117
-26% -$8.46K ﹤0.01% 2668
2024
Q1 		$49.9K Sell
446
-284
-39% -$28.2K ﹤0.01% 2498
2023
Q4 		$42.3K Sell
730
-3,228
-82% -$130K ﹤0.01% 2654
2023
Q3 		$126K Sell
3,958
-256
-6% -$12.2K ﹤0.01% 2556
2023
Q2 		$347K Buy
4,214
+33
+0.8% +$4.83K ﹤0.01% 2447
2023
Q1 		$430K Buy
4,181
+2
+0% +$281 ﹤0.01% 2370
2022
Q4 		$612K Buy
4,179
+85
+2% +$14.4K ﹤0.01% 2246
2022
Q3 		$692K Buy
4,094
+25
+0.6% +$4.06K ﹤0.01% 2152
2022
Q2 		$470K Buy
4,069
+855
+27% +$80.4K ﹤0.01% 2425
2022
Q1 		$321K Sell
3,214
-276
-8% -$32.2K ﹤0.01% 2543
2021
Q4 		$543K Buy
3,490
+142
+4% +$27.6K ﹤0.01% 2480
2021
Q3 		$789K Sell
3,348
-449
-12% -$131K ﹤0.01% 2279
2021
Q2 		$1.29M Buy
3,797
+586
+18% +$222K ﹤0.01% 2041
2021
Q1 		$1.3M Sell
3,211
-11
-0.3% -$5.34K ﹤0.01% 1983
2020
Q4 		$2.14M Sell
3,222
-3,420
-51% -$1.9M ﹤0.01% 1601
2020
Q3 		$3.09M Buy
6,642
+3,876
+140% +$1.96M 0.01% 1244
2020
Q2 		$1.62M Buy
2,766
+529
+24% +$181K ﹤0.01% 1593
2020
Q1 		$326K Buy
2,237
+25
+1% +$4.37K ﹤0.01% 2305
2019
Q4 		$317K Hold
2,212
– – ﹤0.01% 2583
2019
Q3 		$87K Hold
2,212
– – ﹤0.01% 2956
2019
Q2 		$224K Buy
2,212
+1,450
+190% +$171K ﹤0.01% 2803
2019
Q1 		$100K Hold
762
– – ﹤0.01% 2907
2018
Q4 		$78K Hold
762
– – ﹤0.01% 2951
2018
Q3 		$191K Hold
762
– – ﹤0.01% 2903
2018
Q2 		$340K Buy
762
+81
+12% +$35.6K ﹤0.01% 2660
2018
Q1 		$269K Buy
681
+353
+108% +$139K ﹤0.01% 2673
2017
Q4 		$135K Hold
328
– – ﹤0.01% 2903
2017
Q3 		$142K Buy
+328
New +$129K ﹤0.01% 2936

Other funds holding MRSN

NI
Nextech Invest Zurich, Switzerland $1.42B AUM 304.47% 1-Year Est. Return
BCLSI
Bain Capital Life Sciences Investors Boston, Massachusetts $1.11B AUM 171.34% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
SSA
Schonfeld Strategic Advisors New York $14.2B AUM 37.17% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $218B AUM 29.41% 1-Year Est. Return
RSCM
Rock Springs Capital Management Baltimore, Maryland $1.7B AUM 93.03% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
SCM
Silverarc Capital Management Boston, Massachusetts $980M AUM 470.8% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return

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

California State Teachers Retirement System (CalSTRS) sold out of Mersana Therapeutics (MRSN) in Q2 2025, closing a stake of 329 shares — an estimated $2.83K sold.

California State Teachers Retirement System (CalSTRS) first reported a position in MRSN in Q3 2017 and held it in 31 quarters. The position peaked at $3.09M in Q3 2020. 83 funds tracked by Wall St. Rank hold MRSN as of Q2 2025.

  • California State Teachers Retirement System (CalSTRS) reported no remaining Mersana Therapeutics position as of Q2 2025 after selling out during the quarter.
  • California State Teachers Retirement System (CalSTRS) sold 329 Mersana Therapeutics shares in Q2 2025, an estimated $2.83K.
  • California State Teachers Retirement System (CalSTRS) first reported a position in Mersana Therapeutics in Q3 2017 and held it in 31 quarters.
  • California State Teachers Retirement System (CalSTRS)'s Mersana Therapeutics position peaked at $3.09M in Q3 2020.
  • 83 funds tracked by Wall St. Rank held Mersana Therapeutics as of Q2 2025.

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