| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 02/03/2023 | Seres Therapeutics, Inc. | MCRB | Grant | Stock Option (Right to Buy) | 85k | $5.50 | $467.5k | | 02/03/2023 |
| 02/03/2023 | Seres Therapeutics, Inc. | MCRB | Grant | Restricted Stock Units | 42.5k | $0.00 | $0 | | 02/03/2023 |
| 07/05/2022 | Seres Therapeutics, Inc. | MCRB | Grant | COMMON STOCK | 63.5k | $3.15 | $200k | | 07/05/2022 |
| 02/04/2022 | Seres Therapeutics, Inc. | MCRB | Grant | Stock Option (Right to Buy) | 130k | $7.38 | $959.4k | | 02/04/2022 |
| 02/04/2021 | Seres Therapeutics, Inc. | MCRB | Grant | Stock Option (Right to Buy) | 100k | $26.34 | $2.6M | | 02/04/2021 |
| 01/29/2020 | Seres Therapeutics, Inc. | MCRB | Grant | STOCK OPTION (RIGHT TO BUY) | 350k | $3.30 | $1.2M | | 01/29/2020 |
| 01/26/2020 | Seres Therapeutics, Inc. | MCRB | Exercise | RESTRICTED STOCK UNITS | 25k | $0.00 | $0 | | 01/26/2020 |
| 01/28/2019 | Seres Therapeutics, Inc. | MCRB | Sale | COMMON STOCK | 5.5k | $5.75 | $31.5k | | 01/25/2019 |
| 01/26/2019 | Seres Therapeutics, Inc. | MCRB | Exercise | RESTRICTED STOCK UNITS | 15k | $0.00 | $0 | | 01/25/2019 |
| 01/25/2019 | Seres Therapeutics, Inc. | MCRB | Grant | STOCK OPTION (RIGHT TO BUY) | 84.8k | $6.01 | $509.6k | | 01/25/2019 |
| 01/30/2018 | Seres Therapeutics, Inc. | MCRB | Grant | STOCK OPTION (RIGHT TO BUY) | 80k | $10.42 | $833.6k | | 01/26/2018 |
| 01/30/2018 | Seres Therapeutics, Inc. | MCRB | Grant | STOCK OPTION (RIGHT TO BUY) | 100k | $10.42 | $1M | | 01/26/2018 |
| 01/26/2018 | Seres Therapeutics, Inc. | MCRB | Sale | COMMON STOCK | 3.5k | $11.02 | $38.3k | | 01/26/2018 |
| 01/26/2018 | Seres Therapeutics, Inc. | MCRB | Exercise | RESTRICTED STOCK UNITS | 10k | $0.00 | $0 | | 01/26/2018 |
| 01/26/2017 | Seres Therapeutics, Inc. | MCRB | Grant | Restricted Stock Units | 50k | $0.00 | $0 | | 01/26/2017 |
| 01/26/2017 | Seres Therapeutics, Inc. | MCRB | Grant | Stock Option (right to buy) | 60k | $9.89 | $593.4k | | 01/26/2017 |
| 06/01/2016 | Seres Therapeutics, Inc. | MCRB | Grant | Stock Option (right to buy) | 100k | $30.90 | $3.1M | | 06/01/2016 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 149 | $41.50 | $6.2k | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 9.2k | $32.52 | $300k | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Exercise | Restricted Stock Units | 5.8k | $0.00 | $0 | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 17.5k | $62.16 | $1.1M | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 35k | $58.50 | $2M | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 35k | $62.98 | $2.2M | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 24.6k | $43.90 | $1.1M | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 10.8k | $46.24 | $499.4k | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 23k | $51.52 | $1.2M | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 16.6k | $58.66 | $975.2k | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Stock Option (right to buy) | 17.5k | $68.48 | $1.2M | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Other | Genzyme common stock (GENZ) | 5.7k | $74.00 | $424.6k | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Disposition | Genzyme common stock (GENZ) | 11.4k | $74.00 | $841.8k | | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Other | Genzyme common stock (GENZ) | 4.9k | $74.00 | $366.1k | By 401(k) | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Other | Genzyme common stock (GENZ) | 779 | $74.00 | $57.6k | By Daughter | 04/04/2011 |
| 04/04/2011 | GENZYME CORP | GENZ | Exercise | Restricted Stock Units | 5.5k | $0.00 | $0 | | 04/04/2011 |