Upstream Bio, Inc. (UPB) — Ownership
Institutional and insider ownership of Upstream Bio, Inc., top holders, and 13F filings.
Institutional ownership
| Year | Holders | % institutional |
|---|---|---|
| 2026 Q1 | 145 | 82.76% |
Institutional and insider ownership of Upstream Bio, Inc., top holders, and 13F filings.
Institutional ownership
| Year | Holders | % institutional |
|---|---|---|
| 2026 Q1 | 145 | 82.76% |