| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 01/17/2023 | Mersana Therapeutics, Inc. | MRSN | Sale | Common Stock | 782 | $5.74 | $4.5k | | 01/13/2023 |
| 01/14/2023 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted stock unit | 2.5k | $0.00 | $0 | | 01/13/2023 |
| 01/13/2023 | Mersana Therapeutics, Inc. | MRSN | Grant | Restricted stock unit | 35.8k | $0.00 | $0 | | 01/13/2023 |
| 01/13/2023 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock option (right to buy) | 161.2k | $6.06 | $977.2k | | 01/13/2023 |
| 04/26/2022 | Mersana Therapeutics, Inc. | MRSN | Sale | Common Stock | 3.9k | $3.69 | $14.6k | | 04/26/2022 |
| 04/26/2022 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted stock unit | 13.2k | $0.00 | $0 | | 04/26/2022 |
| 01/14/2022 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock Option (right to buy) | 45k | $6.28 | $282.6k | | 01/14/2022 |
| 01/14/2022 | Mersana Therapeutics, Inc. | MRSN | Grant | Restricted Stock Units | 10k | $0.00 | $0 | | 01/14/2022 |
| 04/26/2021 | Mersana Therapeutics, Inc. | MRSN | Grant | Restricted stock unit | 26.5k | $0.00 | $0 | | 04/26/2021 |
| 04/26/2021 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock Option (right to buy) | 112.5k | $16.98 | $1.9M | | 04/26/2021 |
| 07/20/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 1.1k | $33.95 | $36.9k | | 07/17/2020 |
| 07/17/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Exercise | Restricted Stock Units | 2.4k | $0.00 | $0 | | 07/17/2020 |
| 06/30/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 6.8k | $35.10 | $239.1k | | 06/29/2020 |
| 06/29/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Grant | Restricted Stock Units | 15k | $0.00 | $0 | | 06/29/2020 |
| 06/29/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Grant | Common Stock | 15k | $0.00 | $0 | | 06/29/2020 |
| 06/12/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 6.8k | $30.15 | $203.7k | | 06/11/2020 |
| 06/11/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Grant | Restricted Stock Units | 15k | $0.00 | $0 | | 06/11/2020 |
| 06/11/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Grant | Common Stock | 15k | $0.00 | $0 | | 06/11/2020 |
| 04/20/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 1.1k | $28.97 | $32.6k | | 04/17/2020 |
| 04/17/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Exercise | Restricted Stock Units | 2.4k | $0.00 | $0 | | 04/17/2020 |
| 03/06/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 5.3k | $29.00 | $153.8k | | 03/05/2020 |
| 03/05/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Grant | Restricted Stock Units | 15k | $0.00 | $0 | | 03/05/2020 |
| 03/05/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Grant | Common Stock | 15k | $0.00 | $0 | | 03/05/2020 |
| 02/14/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 6.9k | $31.54 | $217.4k | | 02/14/2020 |
| 02/13/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 3.1k | $30.03 | $93.3k | | 02/12/2020 |
| 02/12/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Exercise | Restricted Stock Units | 10k | $0.00 | $0 | | 02/12/2020 |
| 02/07/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Grant | Restricted Stock Units | 37.5k | $0.00 | $0 | | 02/07/2020 |
| 02/07/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Grant | Stock Option (Right to Buy) | 75k | $31.87 | $2.4M | | 02/07/2020 |
| 01/22/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 1.6k | $28.98 | $45.7k | | 01/22/2020 |
| 01/21/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 860 | $30.08 | $25.9k | | 01/17/2020 |
| 01/17/2020 | MOMENTA PHARMACEUTICALS INC | MNTA | Exercise | Restricted Stock Units | 2.4k | $0.00 | $0 | | 01/17/2020 |
| 10/21/2019 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 6.8k | $14.40 | $98.1k | | 10/21/2019 |
| 04/29/2019 | MOMENTA PHARMACEUTICALS INC | MNTA | Sale | Common Stock | 10.4k | $14.77 | $153.4k | | 04/29/2019 |
| 04/13/2019 | MOMENTA PHARMACEUTICALS INC | MNTA | Disposition | Common Stock | 4.7k | $0.00 | $0 | | 04/13/2019 |
| 04/13/2019 | MOMENTA PHARMACEUTICALS INC | MNTA | Disposition | Common Stock | 4.7k | $0.00 | $0 | | 04/13/2019 |
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