Upstream Bio annual shares outstanding
2022
2023
2024
2025
Upstream Bio Shares Outstanding History (UPB)
Upstream Bio reported 54.2M shares outstanding at the end of fiscal 2025.
View full Upstream Bio company overviewUpstream Bio annual shares outstanding history
| Fiscal year | Period ended | Shares outstanding | Change | Growth |
|---|---|---|---|---|
| 2025 | 2025-12-31 | 54.2M | 634,352 | +1.18% |
| 2024 | 2024-12-31 | 53.6M | 50.6M | +1691.27% |
| 2023 | 2023-12-31 | 3.0M | −48.3M | −94.17% |
| 2022 | 2022-12-31 | 51.3M | — | — |
Upstream Bio quarterly shares outstanding
Q4.23
Q3.24
Q4.24
Q1.25
Q2.25
Q3.25
Q4.25
Q1.26
Q2.26
| Fiscal quarter | Period ended | Shares outstanding | Change | YoY change |
|---|---|---|---|---|
| Q2 2026 | 2026-06-30 | 54.8M | 972,890 | +1.81% |
| Q1 2026 | 2026-03-31 | 54.4M | 779,091 | +1.45% |
| Q4 2025 | 2025-12-31 | 54.2M | 634,352 | +1.18% |
| Q3 2025 | 2025-09-30 | 54.0M | 51.0M | +1684.84% |
| Q2 2025 | 2025-06-30 | 53.8M | — | — |
| Q1 2025 | 2025-03-31 | 53.6M | — | — |
| Q4 2024 | 2024-12-31 | 53.6M | 50.6M | +1691.27% |
| Q3 2024 | 2024-09-30 | 3.0M | — | — |
| Q4 2023 | 2023-12-31 | 3.0M | — | — |
Upstream Bio shares outstanding trends
Between the periods ended 2022-12-31 and 2025-12-31, Upstream Bio's shares outstanding moved from 51.3M to 54.2M, a change of 2.9M. The latest reported quarter, Q2 2026, shows 54.8M.
About the metric
What shares outstanding means
Shares outstanding is the number of common shares held by investors at a reporting-period end. The count can change because of stock issuance, repurchases, conversions, acquisitions, or stock splits.
Calculation and source
SEC-reported period-end shares
TickerStat displays period-end common shares from SEC filings and adjusts older values to the current share basis when a stock-split conversion ratio is reported directly or evidenced by a later filing’s restated historical share balance. After repeated reverse splits, an old period can represent less than one current-basis share; this is a split-adjusted equivalent, not a literal historical certificate count. Values remain as reported when no reliable split ratio is available. Fiscal periods can differ from calendar years, so exact period-end dates are included.
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