Walleye Trading
MRSN

Walleye Trading’s Mersana Therapeutics MRSN Stock Holding History

Walleye Trading’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
Q3 		– Sell
-1,261
Closed -$9.33K – 4663
2025
Q2 		$9.33K Hold
1,261
– – ﹤0.01% 4048
2025
Q1 		$10.9K Hold
1,261
– – ﹤0.01% 3845
2024
Q4 		$45.1K Hold
1,261
– – ﹤0.01% 3813
2024
Q3 		$59.6K Hold
1,261
– – ﹤0.01% 3481
2024
Q2 		$63.4K Hold
1,261
– – ﹤0.01% 3518
2024
Q1 		$141K Buy
+1,261
New +$125K ﹤0.01% 3616
2023
Q4 		– Sell
-4,860
Closed -$154K – 5342
2023
Q3 		$154K Buy
+4,860
New +$231K ﹤0.01% 3764
2023
Q2 		– Sell
-857
Closed -$88K – 4994
2023
Q1 		$88K Buy
+857
New +$120K ﹤0.01% 3902
2022
Q2 		– Sell
-2,461
Closed -$245K – 5478
2022
Q1 		$245K Sell
2,461
-8
-0.3% -$935 ﹤0.01% 3629
2021
Q4 		$384K Buy
2,469
+1,523
+161% +$296K ﹤0.01% 3211
2021
Q3 		$223K Buy
946
+338
+56% +$98.7K ﹤0.01% 3750
2021
Q2 		$206K Buy
+608
New +$230K ﹤0.01% 3881
2019
Q4 		– Sell
-609
Closed -$24K – 4459
2019
Q3 		$24K Buy
609
+73
+14% +$5.31K ﹤0.01% 3733
2019
Q2 		$54K Buy
+536
New +$63.1K ﹤0.01% 3511

Other funds holding MRSN

NI
Nextech Invest Zurich, Switzerland $2.11B AUM 413.84% 1-Year Est. Return
AV
Alamea Verwaltungs Edison, New Jersey $125M AUM 27.56% 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
RSCM
Rock Springs Capital Management Baltimore, Maryland $2.05B AUM 161.37% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $84.2B AUM 55.88% 1-Year Est. Return
SCM
Silverarc Capital Management Boston, Massachusetts $962M AUM 524.64% 1-Year Est. Return
6CM
683 Capital Management New York $2.04B AUM 94.26% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Walleye Trading's MRSN Position: Q3 2025 in Review

Walleye Trading sold out of Mersana Therapeutics (MRSN) in Q3 2025, closing a stake of 1,261 shares — an estimated $9.33K sold.

Walleye Trading first reported a position in MRSN in Q2 2019 and held it in 14 quarters. The position peaked at $384K in Q4 2021. 49 funds tracked by Wall St. Rank hold MRSN as of Q3 2025.

  • Walleye Trading reported no remaining Mersana Therapeutics position as of Q3 2025 after selling out during the quarter.
  • Walleye Trading sold 1,261 Mersana Therapeutics shares in Q3 2025, an estimated $9.33K.
  • Walleye Trading first reported a position in Mersana Therapeutics in Q2 2019 and held it in 14 quarters.
  • Walleye Trading's Mersana Therapeutics position peaked at $384K in Q4 2021.
  • 49 funds tracked by Wall St. Rank held Mersana Therapeutics as of Q3 2025.

Based on Walleye Trading's 13F filing for Q3 2025, filed 14 Nov 2025.