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

Upstream Bio has reported Shares Outstanding for 4 years, with the latest figure at $54.4 million in Q1 2026.

• For the quarter ending Q1 2026, Shares Outstanding rose 1.45% year-over-year to $54.4 million; the trailing twelve-month figure through Mar 2026 stood at $54.4 million (up 1.45% YoY), and the FY2025 full-year result was $54.2 million, up 1.18% from the prior year.
• Shares Outstanding for Q1 2026 stood at $54.4 million, roughly flat from $54.2 million in the prior quarter.
• The five-year high for Shares Outstanding was $54.4 million in Q1 2026, with the low at $3.0 million in Q3 2023.
• Average Shares Outstanding over 4 years is $30.8 million, with a median of $53.6 million recorded in 2024.
• Year-over-year, Shares Outstanding surged 1691.27% in 2024 and climbed 1.18% in 2025.
• Tracing UPB's Shares Outstanding over 4 years: 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, then rose 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.

Peer Comparison