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SCHEDULE 13G/A
SCHEDULE 13G/A0000315066-26-002943·Upstream Bio, Inc.
Schedule 13G ownership disclosure
Upstream Bio Inc
COMMON STOCK · CUSIP: 91678A107
Event date: 2026-10-30
Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.
- Filing-level shares
- Unavailable
- Percent of class
- Unavailable
- FMR LLC
Shares: 3,793,955.00 · Class: 6.9%
- Abigail P. Johnson
Shares: 3,793,955.00 · Class: 6.9%
Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.
Source: SEC EDGAR filingFiling metadata
- Accession number
- 0000315066-26-002943
- Form type
- SCHEDULE 13G/A
- Filer
- Upstream Bio, Inc.
- CIK
- CIK 2022626
- Filed
- Nov 06, 2026
- Reporting period
- Oct 30, 2026
- Description
- Schedule 13G beneficial ownership