SCHEDULE: BlackRock Discloses Stake in Upstream Bio Inc.
Beneficial Ownership Filing
BlackRock, Inc. has reported beneficial ownership of 5.2% of Upstream Bio Inc.'s common stock as of June 30, 2026.
Summary
- BlackRock, Inc. has filed a Schedule 13G, indicating its beneficial ownership of 2,814,714 shares of Upstream Bio Inc. common stock.
- This ownership stake represents 5.2% of the total outstanding shares of Upstream Bio Inc.
- The filing date for this event is June 30, 2026.
- BlackRock, Inc. has sole voting power over 2,764,429 shares and sole dispositive power over 2,814,714 shares.
Sentiment
Score: 5
Explanation: StockSavvy.ai views this as a neutral filing, as it primarily reports on existing ownership rather than new developments or performance metrics.
Positives
- BlackRock, a significant institutional investor, has taken a notable stake in Upstream Bio Inc., potentially signaling confidence in the company's prospects.
- The 5.2% ownership indicates a substantial investment by a major financial institution.
Future Outlook
No specific forward-looking statements or guidance were provided in this filing.
Industry Context
StockSavvy.ai notes that institutional investor filings like this Schedule 13G are common for companies in the biotechnology sector as they attract significant investment interest. BlackRock's filing indicates Upstream Bio Inc. is on the radar of major asset managers.
Stakeholder Impact
- Shareholders: The filing confirms a significant institutional investor's stake, which can be viewed positively by the market.
- Management: The increased visibility from a large holder like BlackRock may bring additional scrutiny and expectations.
Key Dates
| Date | Description |
|---|---|
| 2023-04-30 | Previous Power of Attorney dated April 30, 2023 revoked. |
| 2025-01-21 | New Power of Attorney executed by BlackRock, Inc. |
| 2026-06-30 | Date of event requiring filing of Schedule 13G. |
| 2026-07-30 | Signature date on Schedule 13G filing. |
Keywords
Upstream Bio Inc., BlackRock, Schedule 13G, Institutional Investor, Common Stock, Beneficial Ownership
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