SEI Investments
MRSN

SEI Investments’s Mersana Therapeutics MRSN Stock Holding History

SEI Investments’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
-2,781
Closed -$23.9K – 2870
2025
Q1 		$23.9K Hold
2,781
– – ﹤0.01% 2733
2024
Q4 		$99.4K Buy
+2,781
New +$144K ﹤0.01% 2585
2023
Q2 		– Sell
-1,159
Closed -$119K – 2730
2023
Q1 		$119K Buy
+1,159
New +$163K ﹤0.01% 2560
2022
Q4 		– Sell
-812
Closed -$137K – 2626
2022
Q3 		$137K Buy
812
+122
+18% +$19.8K ﹤0.01% 2531
2022
Q2 		$80K Buy
+690
New +$64.9K ﹤0.01% 2584
2018
Q3 		– Sell
-1
Closed -$1K – 3077
2018
Q2 		$1K Buy
+1
New +$439 ﹤0.01% 3489

Other funds holding MRSN

NI
Nextech Invest Zurich, Switzerland $2.11B AUM 413.84% 1-Year Est. Return
BCLSI
Bain Capital Life Sciences Investors Boston, Massachusetts $1.68B AUM 126.09% 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 $27.9B AUM 51.18% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
RSCM
Rock Springs Capital Management Baltimore, Maryland $2.05B AUM 161.37% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
SCM
Silverarc Capital Management Boston, Massachusetts $962M AUM 524.64% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
Renaissance Technologies
Renaissance Technologies New York $72.6B AUM 54.88% 1-Year Est. Return

SEI Investments's MRSN Position: Q2 2025 in Review

SEI Investments sold out of Mersana Therapeutics (MRSN) in Q2 2025, closing a stake of 2,781 shares — an estimated $23.9K sold.

SEI Investments first reported a position in MRSN in Q2 2018 and held it in 6 quarters. The position peaked at $137K in Q3 2022. 83 funds tracked by Wall St. Rank hold MRSN as of Q2 2025.

  • SEI Investments reported no remaining Mersana Therapeutics position as of Q2 2025 after selling out during the quarter.
  • SEI Investments sold 2,781 Mersana Therapeutics shares in Q2 2025, an estimated $23.9K.
  • SEI Investments first reported a position in Mersana Therapeutics in Q2 2018 and held it in 6 quarters.
  • SEI Investments's Mersana Therapeutics position peaked at $137K in Q3 2022.
  • 83 funds tracked by Wall St. Rank held Mersana Therapeutics as of Q2 2025.

Based on SEI Investments's 13F filing for Q2 2025, filed 14 Aug 2025.