UOC
MRSN

UBS O'Connor’s Mersana Therapeutics MRSN Stock Holding History

UBS O'Connor’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
-3,909
Closed -$33.6K – 470
2025
Q1 		$33.6K Sell
3,909
-12,492
-76% -$193K ﹤0.01% 292
2024
Q4 		$586K Sell
16,401
-6,400
-28% -$331K 0.01% 267
2024
Q3 		$1.08M Buy
22,801
+1,029
+5% +$45.4K 0.03% 270
2024
Q2 		$1.09M Buy
21,772
+4,400
+25% +$318K 0.03% 283
2024
Q1 		$1.95M Sell
17,372
-4,854
-22% -$483K 0.06% 178
2023
Q4 		$1.29M Buy
22,226
+10,369
+87% +$417K 0.04% 240
2023
Q3 		$376K Buy
+11,857
New +$564K 0.01% 422
2023
Q2 		– Sell
-18,508
Closed -$2.71M – 647
2023
Q1 		$1.9M Buy
+18,508
New +$2.6M 0.05% 326
2022
Q4 		– Sell
-15,060
Closed -$2.54M – 212
2022
Q3 		$2.54M Sell
15,060
-4,582
-23% -$745K 0.03% 490
2022
Q2 		$2.27M Buy
+19,642
New +$1.85M 0.02% 622

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 $12.3B 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 $5.7T AUM 30.48% 1-Year Est. Return
SCM
Silverarc Capital Management Boston, Massachusetts $849M 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