Score Breakdown
Dilution Forecast
Market Data
Source-Backed Evidence Depth
This public preview uses stored DilutionWatch fields and linked SEC/market records only. Missing values are not estimated.
| Field | Current Value | Basis |
|---|---|---|
| DilutionScore | 43/100 | DilutionWatch score record |
| Shares Outstanding | 54.77M | Verified float table or market cache |
| Public Float | 34.97M | Verified float table or market cache |
| Market Cap | $156.65M | Market data cache |
| Cash Runway | 18.8 months | DilutionWatch score inputs |
| Shelf Capacity | None in current score inputs | SEC-derived dilution fields |
| ATM Capacity | None in current score inputs | SEC-derived dilution fields |
| Outstanding Warrants | None in current score inputs | SEC-derived dilution fields |
Recent source-backed SEC insight records available on this page: 1.
Recent SEC source mix: XBRL 1.
The page does not infer future share issuance, financing probability, cash needs, management intent, or price impact when source fields are absent.
UPB SEC Filing Activity — Last 12 Months
Shares outstanding reported by UPB on the cover page of its latest 10-K/10-Q: 54.77M as of August 04, 2026.
DilutionWatch recorded 1 registration or prospectus document for UPB (the filings through which shares are offered) in the last 12 months. Full filing list on SEC EDGAR →
| Form | What it is | Filings | Most recent |
|---|---|---|---|
| 424B5 | prospectus supplement (ATM / shelf takedown) | 1 | Mar 26, 2026 |
| 8-K | current report (material event) | 5 | Sep 01, 2026 |
| 10-Q | quarterly report | 2 | Aug 11, 2026 |
| SC 13G/A | amended passive >5% holder filing | 1 | Aug 12, 2026 |
| 4 | insider transaction | 10 | Jun 11, 2026 |
| 3 | initial insider ownership | 1 | Jul 30, 2026 |
Institutional Holdings
Institutional holder totals are aggregated from ownership filings and may use a different share basis or reporting date than public float. They are not a reconciliation against tradeable float.
Short Interest
Recent SEC Activity
Recent News
Factual UPB Dilution Snapshot
Upstream Bio, Inc. (UPB) has a DilutionScore of 43/100, rated Medium dilution risk. Score date: October 27, 2026.
- Recent SEC activity tracked for UPB: xbrl on 2024-11-07.
This automatically generated snapshot is assembled from stored DilutionWatch data fields and may contain data-source errors or omissions. It is not financial advice, not investment research, and not a recommendation. Do your own research and review the full disclaimer and terms of service.
DilutionScore History — Last 90 Days
UPB's DilutionScore is currently 43/100 (Medium risk), with 5 score changes tracked over 89 days. The score improved from 38/100 (Medium risk).
| Period | Score | Risk Level | Duration |
|---|---|---|---|
| Oct 10 – Oct 27, 2026 | 43/100 | MEDIUM | 18 days |
| Sep 26 – Oct 09, 2026 | 38/100 | MEDIUM | 14 days |
| Sep 23 – Sep 25, 2026 | 41/100 | MEDIUM | 3 days |
| Aug 22 – Sep 22, 2026 | 38/100 | MEDIUM | 32 days |
| Aug 14 – Aug 21, 2026 | 30/100 | MEDIUM | 7 days |
| Jul 30 – Aug 13, 2026 | 34/100 | MEDIUM | 15 days |
Score recalculated daily from SEC filings and market data. Sign up free for real-time score change alerts.
Share Dilution History
UPB shares outstanding have increased 0.7% from 54.04M (Mar 2026) to 54.42M (May 2026). Each increase represents potential dilution to existing shareholders.
| Date | Shares Outstanding | Public Float | Change |
|---|---|---|---|
| May 30, 2026 | 54.42M | 34.97M | ▼ 0.09% |
| May 17, 2026 | 54.42M | 35.01M | ▲ 1.21% |
| Apr 07, 2026 | 54.42M | 34.59M | ▲ 0.08% |
| Mar 30, 2026 | 54.42M | 34.56M | ▲ 0.41% |
| Mar 20, 2026 | 54.04M | 34.18M | ▼ 0.42% |
Share counts sourced from verified regulatory filings. Increases indicate dilution events.
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