| CUSIP No. 74168J101 | Page 20 of 20 |
Exhibit 99.1
JOINT FILING AGREEMENT
Each of the undersigned hereby acknowledges and agrees, in compliance with the provisions of Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, that the Statement on Schedule 13G with respect to the Common Stock, par value $0.00001 per share, of Prime Medicine, Inc., to which this Agreement is attached as an Exhibit, and any amendments thereto, will be filed with the Securities and Exchange Commission jointly on behalf of the undersigned. This Agreement may be executed, either manually or electronically, in one or more counterparts.
| GV 2019, L.P. | GV 2021, L.P. | |||||
| By: GV 2019 GP, L.P., its General Partner | By: GV 2021 GP, L.P., its General Partner | |||||
| By: GV 2019 GP, L.L.C., its General Partner | By: GV 2021 GP, L.L.C., its General Partner | |||||
| By: | /s/ Inga Goldbard | By: | /s/ Inga Goldbard | |||
| Name: | Inga Goldbard | Name: | Inga Goldbard | |||
| Title: | General Counsel | Title: | General Counsel | |||
| Dated: | February 29, 2024 | Dated: | February 29, 2024 | |||
| GV 2019 GP, L.P. | GV 2021 GP, L.P. | |||||
| By: GV 2019 GP, L.L.C., its General Partner | By: GV 2021 GP, L.L.C., its General Partner | |||||
| By: | /s/ Inga Goldbard | By: | /s/ Inga Goldbard | |||
| Name: | Inga Goldbard | Name: | Inga Goldbard | |||
| Title: | General Counsel | Title: | General Counsel | |||
| Dated: | February 29, 2024 | Dated: | February 29, 2024 | |||
| GV 2019 GP, L.L.C. | GV 2021 GP, L.L.C. | |||||
| By: | /s/ Inga Goldbard | By: | /s/ Inga Goldbard | |||
| Name: | Inga Goldbard | Name: | Inga Goldbard | |||
| Title: | General Counsel | Title: | General Counsel | |||
| Dated: | February 29, 2024 | Dated: | February 29, 2024 | |||
| GV 2023, L.P. | ALPHABET HOLDINGS LLC | |||||
| By: GV 2023 GP, L.P., its General Partner | ||||||
| By: GV 2023 GP, L.L.C., its General Partner | ||||||
| By: | /s/ Inga Goldbard | By: | /s/ Kathryn W. Hall | |||
| Name: | Inga Goldbard | Name: | Kathryn W. Hall | |||
| Title: | General Counsel | Title: | Secretary | |||
| Dated: | February 29, 2024 | Dated: | February 29, 2024 | |||
| GV 2023 GP, L.P. | XXVI HOLDINGS INC. | |||||
| By: GV 2023 GP, L.L.C., its General Partner | ||||||
| By: | /s/ Inga Goldbard | By: | /s/ Kathryn W. Hall | |||
| Name: | Inga Goldbard | Name: | Kathryn W. Hall | |||
| Title: | General Counsel | Title: | Assistant Secretary | |||
| Dated: | February 29, 2024 | Dated: | February 29, 2024 | |||
| GV 2023 GP, L.L.C. | ALPHABET INC. | |||||
| By: | /s/ Inga Goldbard | By: | /s/ Kathryn W. Hall | |||
| Name: | Inga Goldbard | Name: | Kathryn W. Hall | |||
| Title: | General Counsel | Title: | Assistant Secretary | |||
| Dated: | February 29, 2024 | Dated: | February 29, 2024 | |||
