Simplex Trading
MRSN

Simplex Trading’s Mersana Therapeutics MRSN Stock Holding History

Simplex 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
Q1 		– Sell
-4,976
Closed -$177K – 9226
2024
Q4 		$177K Sell
4,976
-152
-3% -$7.86K ﹤0.01% 4642
2024
Q3 		$242K Sell
5,128
-56
-1% -$2.47K ﹤0.01% 4330
2024
Q2 		$260K Buy
+5,184
New +$375K ﹤0.01% 4384
2024
Q1 		– Sell
-1,404
Closed -$81K – 9473
2023
Q4 		$81K Buy
+1,404
New +$56.5K ﹤0.01% 5594
2023
Q3 		– Sell
-1,524
Closed -$125K – 9391
2023
Q2 		$125K Buy
1,524
+1,092
+253% +$160K ﹤0.01% 4814
2023
Q1 		$44K Buy
+432
New +$60.6K ﹤0.01% 6062
2022
Q4 		– Sell
-20
Closed -$3K – 9939
2022
Q3 		$3K Sell
20
-1,116
-98% -$181K ﹤0.01% 9117
2022
Q2 		$131K Buy
1,136
+48
+4% +$4.51K ﹤0.01% 5197
2022
Q1 		$108K Buy
+1,088
New +$127K ﹤0.01% 6031
2021
Q4 		– Sell
-112
Closed -$38K – 11057
2021
Q3 		$38K Hold
112
– – ﹤0.01% 7851
2021
Q2 		$38K Buy
112
+109
+3,633% +$41.3K ﹤0.01% 7973
2021
Q1 		$113K Hold
3
– – ﹤0.01% 5581
2020
Q4 		$226K Buy
3
+2
+200% +$1.11K ﹤0.01% 4442
2020
Q3 		$40K Buy
+1
New +$505 ﹤0.01% 5822
2020
Q2 		– Hold
0
– – – 6601

Other funds holding MRSN

NI
Nextech Invest Zurich, Switzerland $1.42B AUM 304.47% 1-Year Est. Return
AV
Alamea Verwaltungs Edison, New Jersey $135M AUM 36.32% 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
RSCM
Rock Springs Capital Management Baltimore, Maryland $1.7B AUM 93.03% 1-Year Est. Return
Acadian Asset Management
Acadian Asset Management Boston, Massachusetts $70.5B AUM 36% 1-Year Est. Return
SCM
Silverarc Capital Management Boston, Massachusetts $980M AUM 470.8% 1-Year Est. Return
6CM
683 Capital Management New York $1.92B AUM 85.52% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Simplex Trading's MRSN Position: Q2 2025 in Review

Simplex Trading sold out of Mersana Therapeutics (MRSN) in Q2 2025, closing a stake of 137 shares — an estimated $1.2K sold.

Simplex Trading first reported a position in MRSN in Q2 2020 and held it in 17 quarters. The position peaked at $216K in Q2 2023. 83 funds tracked by Wall St. Rank hold MRSN as of Q2 2025.

  • Simplex Trading reported no remaining Mersana Therapeutics position as of Q2 2025 after selling out during the quarter.
  • Simplex Trading sold 137 Mersana Therapeutics shares in Q2 2025, an estimated $1.2K.
  • Simplex Trading first reported a position in Mersana Therapeutics in Q2 2020 and held it in 17 quarters.
  • Simplex Trading's Mersana Therapeutics position peaked at $216K in Q2 2023.
  • 83 funds tracked by Wall St. Rank held Mersana Therapeutics as of Q2 2025.

Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.