Upstream Bio, Inc. (UPB) — Shares Outstanding

Annual figures by fiscal year, from SEC filings.

2023: 2.99M2024: 53.60M2025: 54.24M54.24M
2023Shares Outstanding (shares)2025
Fiscal YearShares OutstandingChange YoY
202554.24M+1.2%
202453.60M+1691.3%
20232.99M