Quick Takeaways
- TCG Crossover GP I, LLC filed SCHEDULE 13G/A for Upstream Bio, Inc. Common Stock, par value $0.001 per share (UPB).
- Disclosed ownership: 3.9%.
- Date of event: 30 Sep 2025.
TCG Crossover GP I, LLC - 30 Sep 2025 SCHEDULE 13G/A Report for Upstream Bio, Inc. Common Stock, par value $0.001 per share (UPB)
- Filing Manager
- TCG Crossover GP I, LLC
- Reporting Manager
- TCG Crossover GP I, LLC
- Symbol
- UPB
- Shares outstanding
- 54,284,692 shares
- Disclosed Ownership
- 2,117,103 shares
- Ownership
- 3.9%
- Form type
- SCHEDULE 13G/A
- Filing time
- 14 Nov 2025, 16:27:07 UTC
- Date of event
- 30 Sep 2025
- Previous filing
- 14 Feb 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"TCG Crossover GP I, LLC disclosed 3.9% ownership in Upstream Bio, Inc. Common Stock, par value $0.001 per share (UPB) on 30 Sep 2025."
What Changed
- Previous schedule filing date: 14 Feb 2025.
- Current filing was accepted on 14 Nov 2025, 16:27.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Official SEC Source
Backed by Schedule 13D/13G
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
See Original FilingReporting Managers (3)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| TCG Crossover GP I, LLC | 3.9% | 2,117,103 | 0 | 2,117,103 | /s/ Craig Skaling | Authorized Signatory | |
| TCG Crossover Fund I, L.P. | 3.9% | 2,117,103 | 0 | 2,117,103 | /s/ Craig Skaling | Authorized Signatory | |
| Chen Yu | 3.9% | 2,117,103 | 0 | 2,117,103 | /s/ Craig Skaling | By POA as Attorney-in-Fact |