Employee Count History - Spero Therapeutics, Inc.
Historical employee count data from SEC filings.
Workforce Trend Analysis
Employee Count History
SEC Filing History
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| Filing Date | Period | Employee Count | Form Type | YoY Change |
|---|---|---|---|---|
| Mar 26, 2026 | Dec 31, 2025 | 25 | 10-K | -21.88% |
| Mar 27, 2025 | Dec 31, 2024 | 32 | 10-K | -30.43% |
| Mar 13, 2024 | Dec 31, 2023 | 46 | 10-K | +31.43% |
| Mar 30, 2023 | Dec 31, 2022 | 35 | 10-K | -76.03% |
| Mar 31, 2022 | Dec 31, 2021 | 146 | 10-K | +64.04% |
| Mar 11, 2021 | Dec 31, 2020 | 89 | 10-K | +56.14% |
Mar 16, 2020 | Dec 31, 2019 | — | — | — |
Mar 14, 2019 | Dec 31, 2018 | — | — | — |
Apr 2, 2018 | Dec 31, 2017 | — | — | — |