Upstream Bio (UPB) Shares Outstanding (2023 - 2026)

Upstream Bio's Shares Outstanding history runs 4 years deep, the most recent figure standing at $54.4 million for Q1 2026.

• In Q1 2026, Shares Outstanding rose 1.45% year-over-year to $54.4 million; the TTM figure through Mar 2026 stood at $54.4 million (up 1.45% YoY), while the FY2025 annual figure was $54.2 million, up 1.18% from the prior year.
• Shares Outstanding was $54.4 million for Q1 2026 at Upstream Bio, roughly flat from $54.2 million in the prior quarter.
• In the past five years, Shares Outstanding ranged from a high of $54.4 million in Q1 2026 to a low of $3.0 million in Q3 2023.
• Historically, Shares Outstanding has averaged $30.8 million across 4 years, with a median of $53.6 million in 2024.
• The sharpest annual moves came in 2024 and 2025: Shares Outstanding soared 1691.27% in 2024, then gained 1.18% in 2025.
• A 4-year view of Shares Outstanding shows it stood at $3.0 million in 2023, then jumped by 1691.27% to $53.6 million in 2024, then grew by 1.18% to $54.2 million in 2025, then increased by 0.34% to $54.4 million in 2026.
• The last three Shares Outstanding figures came in at $54.4 million (Q1 2026), $54.2 million (Q4 2025), and $54.0 million (Q3 2025), per Business Quant data.