Upstream Bio, Inc. (UPB) Institutional Ownership & Insider Trading
149 institutions reported holding Upstream Bio, Inc. shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 15 insider trades on Form 4 since 2025-10-01.
Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason
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- Market cap
- 150.1M
- P/E TTM
- —
- Dividend yield
- —
- 52-week
- —
- Next earnings
- 5 Nov, in 12 days
Institutions · all 13F filers
quarter to 30 Jun 2026 · filers in both quarters149 institutions held 92.3% of the shares. Across filers that reported both quarters, shares held changed +4.2%.
Largest moves, shares (millions)
Institutional flow by quarter
net shares added or trimmed, millions · filers in both quarters| Quarter | Holders | Shares held, M | Change | Increased | New | Decreased | Closed |
|---|---|---|---|---|---|---|---|
| Jun 26 | 149 | 51 | +4.2% | 61 | 34 | 27 | 24 |
| Mar 26 | 139 | 45 | -11.1% | 46 | 38 | 32 | 36 |
| Dec 25 | 131 | 51 | +7.9% | 39 | 38 | 32 | 8 |
| Sep 25 | 92 | 44 | -6.1% | 32 | 22 | 21 | 9 |
| Jun 25 | 82 | 48 | +4.6% | 39 | 13 | 13 | 8 |
| Mar 25 | 76 | 42 | +2.4% | 11 | 22 | 22 | 13 |
| Dec 24 | 68 | 40 | — | — | — | — | — |
Upstream Bio, Inc. — questions
- Who owns Upstream Bio, Inc. stock?
- 149 institutions reported Upstream Bio, Inc. shares in 13F filings for the quarter ended 2026-06-30. The largest: FMR LLC (14.9%), ORBIMED ADVISORS LLC (10.4%), NORGES BANK (6.9%).
- Are Upstream Bio, Inc. insiders buying or selling?
- 15 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.
Every figure on this page comes from Upstream Bio, Inc.'s own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.
How these figures are read: methodology · EquiReason.