Rock Springs Capital Management’s Mersana Therapeutics MRSN Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q1 | – | Sell |
-152,586
| Closed | -$4.41M | – | 103 |
|
|
2025
Q4 | $4.41M | Hold |
152,586
| – | – | 0.23% | 72 |
|
|
2025
Q3 | $1.18M | Sell |
152,586
-1
| -0% | -$8 | 0.07% | 83 |
|
|
2025
Q2 | $1.13M | Hold |
152,587
| – | – | 0.07% | 84 |
|
|
2025
Q1 | $1.31M | Buy |
152,587
+15,320
| +11% | +$236K | 0.08% | 84 |
|
|
2024
Q4 | $4.91M | Buy |
137,267
+15,396
| +13% | +$796K | 0.19% | 79 |
|
|
2024
Q3 | $5.76M | Hold |
121,871
| – | – | 0.19% | 81 |
|
|
2024
Q2 | $6.12M | Hold |
121,871
| – | – | 0.18% | 79 |
|
|
2024
Q1 | $13.6M | Hold |
121,871
| – | – | 0.35% | 68 |
|
|
2023
Q4 | $7.07M | Sell |
121,871
-14,254
| -10% | -$573K | 0.17% | 79 |
|
|
2023
Q3 | $4.32M | Hold |
136,125
| – | – | 0.12% | 86 |
|
|
2023
Q2 | $11.2M | Sell |
136,125
-28,027
| -17% | -$4.1M | 0.27% | 74 |
|
|
2023
Q1 | $16.9M | Hold |
164,152
| – | – | 0.4% | 64 |
|
|
2022
Q4 | $24M | Buy |
164,152
+1,114
| +0.7% | +$188K | 0.58% | 51 |
|
|
2022
Q3 | $27.6M | Hold |
163,038
| – | – | 0.71% | 46 |
|
|
2022
Q2 | $18.8M | Buy |
163,038
+12,805
| +9% | +$1.2M | 0.55% | 53 |
|
|
2022
Q1 | $15M | Buy |
150,233
+20,275
| +16% | +$2.37M | 0.38% | 67 |
|
|
2021
Q4 | $20.2M | Buy |
129,958
+9,130
| +8% | +$1.78M | 0.47% | 64 |
|
|
2021
Q3 | $28.5M | Buy |
120,828
+7,003
| +6% | +$2.05M | 0.6% | 55 |
|
|
2021
Q2 | $38.6M | Buy |
113,825
+2,820
| +3% | +$1.07M | 0.77% | 48 |
|
|
2021
Q1 | $44.9M | Buy |
111,005
+28,458
| +34% | +$13.8M | 0.98% | 31 |
|
|
2020
Q4 | $54.9M | Buy |
82,547
+7,130
| +9% | +$3.96M | 1.17% | 27 |
|
|
2020
Q3 | $35.1M | Buy |
75,417
+280
| +0.4% | +$141K | 0.89% | 37 |
|
|
2020
Q2 | $44M | Buy |
75,137
+25,817
| +52% | +$8.82M | 1.21% | 27 |
|
|
2020
Q1 | $7.19M | Hold |
49,320
| – | – | 0.3% | 87 |
|
|
2019
Q4 | $7.07M | Sell |
49,320
-6,680
| -12% | -$488K | 0.22% | 96 |
|
|
2019
Q3 | $2.21M | Hold |
56,000
| – | – | 0.09% | 125 |
|
|
2019
Q2 | $5.67M | Hold |
56,000
| – | – | 0.21% | 96 |
|
|
2019
Q1 | $7.36M | Buy |
56,000
+16,000
| +40% | +$2.01M | 0.29% | 93 |
|
|
2018
Q4 | $4.08M | Hold |
40,000
| – | – | 0.19% | 105 |
|
|
2018
Q3 | $10M | Hold |
40,000
| – | – | 0.36% | 86 |
|
|
2018
Q2 | $17.9M | Sell |
40,000
-12,000
| -23% | -$5.27M | 0.69% | 48 |
|
|
2018
Q1 | $20.5M | Sell |
52,000
-1,072
| -2% | -$423K | 0.88% | 38 |
|
|
2017
Q4 | $21.8M | Sell |
53,072
-128
| -0.2% | -$55.8K | 0.99% | 31 |
|
|
2017
Q3 | $23M | Sell |
53,200
-7,916
| -13% | -$3.12M | 1.06% | 27 |
|
|
2017
Q2 | $21.3M | Buy |
+61,116
| New | +$21.1M | 1.09% | 31 |
|