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Upstream Bio (UPB) Shares Outstanding (2023 - 2025)

Upstream Bio has reported Shares Outstanding over the past 3 years, most recently at $54.2 million for Q4 2025.

  • Quarterly results put Shares Outstanding at $54.2 million for Q4 2025, up 1.18% from a year ago — trailing twelve months through Dec 2025 was $54.2 million (up 1.18% YoY), and the annual figure for FY2025 was $54.2 million, up 1.18%.
  • Shares Outstanding for Q4 2025 was $54.2 million at Upstream Bio, roughly flat from $54.0 million in the prior quarter.
  • Over the last five years, Shares Outstanding for UPB hit a ceiling of $54.2 million in Q4 2025 and a floor of $3.0 million in Q3 2023.
  • Median Shares Outstanding over the past 3 years was $28.3 million (2024), compared with a mean of $28.4 million.
  • Biggest five-year swings in Shares Outstanding: surged 1691.27% in 2024 and later rose 1.18% in 2025.
  • Upstream Bio's Shares Outstanding stood at $3.0 million in 2023, then surged by 1691.27% to $53.6 million in 2024, then increased by 1.18% to $54.2 million in 2025.
  • The last three reported values for Shares Outstanding were $54.2 million (Q4 2025), $54.0 million (Q3 2025), and $53.8 million (Q2 2025) per Business Quant data.