Spero Therapeutics, Inc. number of employees

Spero Therapeutics, Inc. reported 25 employees at December 31, 2025 in its latest annual report. Revenue per employee was $2.7m.

Headcount by year

Fiscal year end	Employees	Change	Revenue per employee	Source
December 31, 2025	25	—	$2.7m	10-K, filed March 26, 2026

What the annual reports say

Human Capital As of December 31, 2025, we had 25 employees, including a total of 6 employees with M.D. or Ph.D. degrees. 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.

Compare with peers

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Figures from Spero Therapeutics, 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 Spero Therapeutics, Inc.