FMR LLC 13D and 13G filings for Upstream Bio, 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 |
| 2025-08-06 12:19 pm Purchase | 2025-06-30 | 13G | Upstream Bio, Inc. UPB | FMR LLC | 7,936,880 14.800% | 760,693 (+10.60%) | Filing |
| 2025-02-12 09:34 am Purchase | 2024-12-31 | 13G | Upstream Bio, Inc. UPB | FMR LLC | 7,176,187 13.400% | 1,106,311 (+18.23%) | Filing |
| 2024-11-07 09:24 am Purchase | 2024-11-06 | 13G | Upstream Bio, Inc. UPB | FMR LLC | 6,069,876 11.822% | 6,069,876 (New Position) | Filing |