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
Q3 		– Sell
-656
Closed -$1K – 9668
2025
Q2 		$1K Buy
656
+388
+145% +$3.41K ﹤0.01% 8369
2025
Q1 		$2K Sell
268
-3,672
-93% -$56.7K ﹤0.01% 8023
2024
Q4 		$140K Sell
3,940
-140
-3% -$7.24K ﹤0.01% 4864
2024
Q3 		$192K Sell
4,080
-3,856
-49% -$170K ﹤0.01% 4552
2024
Q2 		$398K Buy
7,936
+7,712
+3,443% +$558K ﹤0.01% 3892
2024
Q1 		$25K Hold
224
– – ﹤0.01% 6912
2023
Q4 		$12K Sell
224
-1,276
-85% -$51.3K ﹤0.01% 7309
2023
Q3 		$47K Sell
1,500
-12,016
-89% -$571K ﹤0.01% 5867
2023
Q2 		$1.11M Buy
13,516
+5,588
+70% +$818K ﹤0.01% 2508
2023
Q1 		$814K Buy
7,928
+7,908
+39,540% +$1.11M ﹤0.01% 2781
2022
Q4 		$2K Sell
20
-412
-95% -$69.6K ﹤0.01% 8613
2022
Q3 		$73K Buy
432
+384
+800% +$62.4K ﹤0.01% 5933
2022
Q2 		$5K Buy
+48
New +$4.51K ﹤0.01% 8842
2022
Q1 		– Sell
-52
Closed -$8K – 11040
2021
Q4 		$8K Sell
52
-24
-32% -$4.67K ﹤0.01% 9207
2021
Q3 		$26K Hold
76
– – ﹤0.01% 8201
2021
Q2 		$25K Buy
76
+67
+744% +$25.4K ﹤0.01% 8388
2021
Q1 		$364K Buy
9
+8
+800% +$3.88K ﹤0.01% 3869
2020
Q4 		$47K Sell
1
-10
-91% -$5.56K ﹤0.01% 6248
2020
Q3 		$489K Buy
+11
New +$5.56K ﹤0.01% 3023
2020
Q2 		– Hold
0
– – – 6300

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.