Upstream Bio, Inc. number of employees

Upstream Bio, Inc. reported 75 employees at December 31, 2025 in its latest annual report. Revenue per employee was $38,053.

Headcount by year

Fiscal year end	Employees	Change	Revenue per employee	Source
December 31, 2025	75	—	$38,053	10-K, filed March 26, 2026

What the annual reports say

Employees and human capital resources As of March 20, 2026, we had 75 full-time employees, 22 of which have M.D. or Ph.D. degrees, and seven full-time consultants. 2025 annual report

Headcount as the company states it in Item 1 of its annual report (some count full-time equivalents or exclude part-time and temporary staff), at the date it gives. Years where the report states no clear total are left out rather than estimated. Changes can reflect acquisitions and disposals as well as hiring and job cuts.

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Figures from Upstream Bio, Inc.'s SEC filings (10-K and 10-Q), retrieved October 29, 2026. How we read and check them: methodology and data sources. Not investment advice. Back to Upstream Bio, Inc.