UPB — Upstream Bio Inc Com Institutional Holders · Q3 2026
Who owns Upstream Bio Inc Com (UPB)? 2 institutions reported holding $9,919 in SEC 13F filings for Q3 2026 (period ended 2026-09-30). Largest holders: GAMMA Investing LLC ($8,580), Farther Finance Advisors, LLC ($1,339).
| Rank | Institution | Value | Shares | Change |
|---|---|---|---|---|
| 1 | GAMMA Investing LLC | $8,580 | 1,628 | Added |
| 2 | Farther Finance Advisors, LLC | $1,339 | 254 | Trimmed |
Source: SEC Form 13F filings · as of 2026-09-30