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Rock Springs Capital Management LP
> MRSN
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | Mersana Therapeutics, Inc. | MRSN | 3,403,133 | -700,670 | 11,196,308,000 | -5,670,322,000 | $3,290.00 |
| 03/31/2023 | Mersana Therapeutics, Inc. | MRSN | 4,103,803 | 0 | 16,866,630,000 | -7,181,656,000 | $4,110.00 |
| 12/31/2022 | Mersana Therapeutics, Inc. | MRSN | 4,103,803 | 27,845 | 24,048,286,000 | 24,020,733,000 | $5,860.00 |
| 09/30/2022 | Mersana Therapeutics, Inc. | MRSN | 4,075,958 | 0 | 27,553,000 | 8,722,000 | $6.76 |
| 06/30/2022 | Mersana Therapeutics, Inc. | MRSN | 4,075,958 | 320,138 | 18,831,000 | 3,845,000 | $4.62 |
| 03/31/2022 | Mersana Therapeutics, Inc. | MRSN | 3,755,820 | 506,870 | 14,986,000 | -5,222,000 | $3.99 |
| 12/31/2021 | Mersana Therapeutics, Inc. | MRSN | 3,248,950 | 228,248 | 20,208,000 | -8,277,000 | $6.22 |
| 09/30/2021 | Mersana Therapeutics, Inc. | MRSN | 3,020,702 | 175,084 | 28,485,000 | -10,158,000 | $9.43 |
| 06/30/2021 | Mersana Therapeutics, Inc. | MRSN | 2,845,618 | 70,491 | 38,643,000 | -6,259,000 | $13.58 |
| 03/31/2021 | Mersana Therapeutics, Inc. | MRSN | 2,775,127 | 711,460 | 44,902,000 | -10,012,000 | $16.18 |
| 12/31/2020 | Mersana Therapeutics, Inc. | MRSN | 2,063,667 | 178,239 | 54,914,000 | 19,807,000 | $26.61 |
| 09/30/2020 | Mersana Therapeutics, Inc. | MRSN | 1,885,428 | 7,000 | 35,107,000 | -8,848,000 | $18.62 |
| 06/30/2020 | Mersana Therapeutics, Inc. | MRSN | 1,878,428 | 645,428 | 43,955,000 | 36,767,000 | $23.40 |
| 03/31/2020 | Mersana Therapeutics, Inc. | MRSN | 1,233,000 | 0 | 7,188,000 | 123,000 | $5.83 |
| 12/31/2019 | Mersana Therapeutics, Inc. | MRSN | 1,233,000 | -167,000 | 7,065,000 | 4,853,000 | $5.73 |
| 09/30/2019 | Mersana Therapeutics, Inc. | MRSN | 1,400,000 | 0 | 2,212,000 | -3,458,000 | $1.58 |
| 06/30/2019 | Mersana Therapeutics, Inc. | MRSN | 1,400,000 | 0 | 5,670,000 | -1,694,000 | $4.05 |
| 03/31/2019 | Mersana Therapeutics, Inc. | MRSN | 1,400,000 | 400,000 | 7,364,000 | 3,284,000 | $5.26 |
| 12/31/2018 | Mersana Therapeutics, Inc. | MRSN | 1,000,000 | 0 | 4,080,000 | -5,920,000 | $4.08 |
| 09/30/2018 | Mersana Therapeutics, Inc. | MRSN | 1,000,000 | 0 | 10,000,000 | -7,860,000 | $10.00 |
| 06/30/2018 | Mersana Therapeutics, Inc. | MRSN | 1,000,000 | -300,000 | 17,860,000 | -2,641,000 | $17.86 |
| 03/31/2018 | Mersana Therapeutics, Inc. | MRSN | 1,300,000 | -26,800 | 20,501,000 | -1,298,000 | $15.77 |
| 12/31/2017 | Mersana Therapeutics, Inc. | MRSN | 1,326,800 | -3,200 | 21,799,324 | -1,196,676 | $16.43 |
| 09/30/2017 | Mersana Therapeutics, Inc. | MRSN | 1,330,000 | -197,893 | 22,996,000 | 1,651,000 | $17.29 |
| 06/30/2017 | Mersana Therapeutics, Inc. | MRSN | 1,527,893 | 1,527,893 | 21,345,000 | 21,345,000 | $13.97 |
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