Pfizer Inc. 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 |
| 2021-07-09 4:25 pm Purchase | 2021-06-30 | 13G | Spero Therapeutics, Inc. SPRO | PFIZER INC PFE | 2,362,348 7.370% | 2,362,348 (New Position) | Filing |