Atlas Venture Fund X, L.P. 13D and 13G filings for Spero Therapeutics, Inc.:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2021-02-16 5:29 pm Purchase | 2021-02-12 | 13D | Spero Therapeutics, Inc. SPRO | Atlas Venture Fund X, L.P. | 1,031,160 3.800% | 1,031,160 (New Position) | Filing |