Quick Answer
Spero Therapeutics, Inc. reported Common Stock Shares Outstanding of 56.41 million shares for the year ending 2025.
- Spero Therapeutics, Inc. showed an increase of +3.3% in Common Stock Shares Outstanding from 2024 to 2025.
- This data is from Spero Therapeutics, Inc.'s annual report (Form 10-K), filed with the SEC on March 26, 2026.
- XBRL data for this metric is available from 2016 to 2025 (10 years of filings). Earlier data may not exist in machine-readable XBRL format as companies adopted electronic filing at different times.
- Historical annual values: Fiscal year 2025: 56.41 million shares | Fiscal year 2024: 54.59 million shares | Fiscal year 2023: 53.00 million shares | Fiscal year 2022: 52.46 million shares | Fiscal year 2021: 32.39 million shares | Fiscal year 2020: 29.26 million shares | Fiscal year 2019: 19.19 million shares | Fiscal year 2018: 17.21 million shares | Fiscal year 2017: 14.37 million shares | Fiscal year 2016: 0 shares.
- Data sourced from SEC EDGAR public filings as of June 23, 2026.
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