Explanatory Note
This Amendment No. 1 to Schedule 13D (Amendment No. 1) amends and supplements the Schedule 13D initially filed by
the Reporting Persons with the Securities and Exchange Commission (the Commission) on February 10, 2023 (the Original Schedule 13D). Only those items that are hereby reported are amended; all other items
reported in the Original Schedule 13D remain unchanged. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable. Capitalized terms not defined in this Amendment have the meanings
ascribed to them in the Original Schedule 13D.
Item 1. Security and Issuer
This Amendment No. 1 is filed with respect to the Issuers Common Stock. The address of the principal executive offices of the Issuer is 100
Forge Road, Suite 700, Watertown, MA 02472. Information given in response to each item shall be deemed incorporated by reference in all other items, as applicable.
Item 5. Interest in Securities of the Issuer.
Solely on behalf of, and only to the extent that it relates to the Reporting Persons, Items 5(a) and 5(b) of the Original Schedule 13D is hereby amended as
follows:
The information reported on the cover page of each Reporting Person, except Mr. Vitorovic, is based on a total of 39,647,533 shares of the
Issuers Common Stock outstanding as of July 31, 2024, as reported in the Form 10-Q filed with the Commission on August 13, 2024.
The information reported on the cover page of Mr. Vitorovic is based on a total of 39,673,616 shares, comprised of (i) 39,647,533 shares of the
Issuers Common Stock outstanding as of July 31, 2024, as reported in the Form 10-Q filed with the Commission on August 13, 2024 and (ii) 26,083 shares of the Issuers Common Stock
underlying fully vested stock options granted to Mr. Vitorovic for service as a member of the Issuers board of directors.
This Amendment
No. 1 is being filed to update the aggregate percentage of the Issuers Common Stock owned by the Reporting Persons due to dilution caused by, among other things, the Issuers sales of additional shares of its Common Stock from time
to time since the date of the filing of the Original Schedule 13D and not in connection with any transaction in the Issuers securities by the Reporting Persons. Such dilution resulted in a decrease of over one percent (1%) in the aggregate
percentage ownership reported by the Reporting Persons in the Original Schedule 13D.
(a) and (b) See Items
7-11 and 13 of the cover pages of this Amendment No. 1 for each Reporting Person and Item 2 above.