| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 06/15/2023 | Nuvalent, Inc. | | Grant | Stock Option (Right to Buy) | 15k | $44.68 | $670.2k | | 06/15/2023 |
| 01/17/2023 | Mersana Therapeutics, Inc. | MRSN | Sale | Common Stock | 17.3k | $5.74 | $99.6k | | 01/13/2023 |
| 01/15/2023 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted stock unit | 21.2k | $0.00 | $0 | | 01/13/2023 |
| 01/15/2023 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted stock unit | 17.7k | $0.00 | $0 | | 01/13/2023 |
| 01/14/2023 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted stock unit | 16.8k | $0.00 | $0 | | 01/13/2023 |
| 01/13/2023 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock option (right to buy) | 562.5k | $6.06 | $3.4M | | 01/13/2023 |
| 01/13/2023 | Mersana Therapeutics, Inc. | MRSN | Grant | Restricted stock unit | 125k | $0.00 | $0 | | 01/13/2023 |
| 06/16/2022 | Nuvalent, Inc. | | Grant | Stock Option (Right to Buy) | 20k | $9.36 | $187.2k | | 06/16/2022 |
| 05/20/2022 | Mersana Therapeutics, Inc. | MRSN | Gift | Common Stock | 240.2k | $0.00 | $0 | | 01/13/2023 |
| 05/20/2022 | Mersana Therapeutics, Inc. | MRSN | Gift | Common Stock | 240.2k | $0.00 | $0 | By Trust | 01/13/2023 |
| 03/30/2022 | Nuvalent, Inc. | | Grant | Stock Option (Right to Buy) | 40k | $14.08 | $563.2k | | 03/30/2022 |
| 01/14/2022 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted Stock Units | 17.7k | $0.00 | $0 | | 01/14/2022 |
| 01/14/2022 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted Stock Units | 21.2k | $0.00 | $0 | | 01/14/2022 |
| 01/14/2022 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock Option (right to buy) | 301.4k | $6.28 | $1.9M | | 01/14/2022 |
| 01/14/2022 | Mersana Therapeutics, Inc. | MRSN | Grant | Restricted Stock Units | 67k | $0.00 | $0 | | 01/14/2022 |
| 07/19/2021 | Mersana Therapeutics, Inc. | MRSN | Sale | Common Stock | 21.9k | $12.02 | $263.3k | | 07/15/2021 |
| 07/16/2021 | Mersana Therapeutics, Inc. | MRSN | Sale | Common Stock | 20k | $12.47 | $249.9k | | 07/15/2021 |
| 07/15/2021 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted Stock Units | 100k | $0.00 | $0 | | 07/15/2021 |
| 06/03/2021 | Dicerna Pharmaceuticals Inc | DRNA | Exercise | Restricted Stock Units | 3.3k | $0.00 | $0 | | 06/03/2021 |
| 01/15/2021 | Mersana Therapeutics, Inc. | MRSN | Payment of Exercise | Common Stock | 5.2k | $21.09 | $109.6k | | 01/15/2021 |
| 01/15/2021 | Mersana Therapeutics, Inc. | MRSN | Exercise | Restricted Stock Units | 17.7k | $0.00 | $0 | | 01/15/2021 |
| 01/15/2021 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock Option (right to buy) | 382.5k | $21.09 | $8.1M | | 01/15/2021 |
| 01/15/2021 | Mersana Therapeutics, Inc. | MRSN | Grant | Restricted Stock Units | 85k | $0.00 | $0 | | 01/15/2021 |
| 06/15/2020 | Dicerna Pharmaceuticals Inc | DRNA | Grant | Restricted Stock Units | 3.3k | $0.00 | $0 | | 06/15/2020 |
| 06/15/2020 | Dicerna Pharmaceuticals Inc | DRNA | Grant | Director Stock Option (Right to Buy) | 15k | $21.61 | $324.2k | | 06/15/2020 |
| 01/15/2020 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock Option (right to buy) | 318.8k | $6.16 | $2M | | 01/15/2020 |
| 01/15/2020 | Mersana Therapeutics, Inc. | MRSN | Grant | Restricted Stock Units | 70.8k | $0.00 | $0 | | 01/15/2020 |
| 07/17/2019 | Mersana Therapeutics, Inc. | MRSN | Grant | Restricted Stock Units | 100k | $0.00 | $0 | | 07/17/2019 |
| 06/20/2019 | Dicerna Pharmaceuticals Inc | DRNA | Grant | Director Stock Option (right to buy) | 25k | $15.44 | $386k | | 06/20/2019 |
| 01/23/2019 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock Option (right to buy) | 217.5k | $3.51 | $763.4k | | 01/23/2019 |
| 01/23/2019 | Dicerna Pharmaceuticals Inc | DRNA | Grant | Director Stock Option (Right to Buy) | 25k | $10.31 | $257.8k | | 01/23/2019 |
| 03/08/2018 | Bioverativ Inc. | BIVV | Disposition | Common Stock | 1.1k | $0.00 | $0 | | 03/08/2018 |
| 03/08/2018 | Bioverativ Inc. | BIVV | Disposition | Restricted Stock Units | 5.5k | $0.00 | $0 | | 03/08/2018 |
| 03/08/2018 | Bioverativ Inc. | BIVV | Disposition | Non-Qualified Stock Option | 23k | $52.08 | $1.2M | | 03/08/2018 |
| 02/02/2018 | Mersana Therapeutics, Inc. | MRSN | Grant | Stock Option (right to buy) | 200k | $14.23 | $2.8M | | 02/02/2018 |
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