Spero Therapeutics, Inc. (SPRO) — Shares Outstanding

Annual figures by fiscal year, from SEC filings.

2016: 02017: 14.37M2018: 17.21M2019: 19.19M2020: 29.26M2021: 32.39M2022: 52.46M2023: 53.00M2024: 54.59M2025: 56.41M56.41M
2016Shares Outstanding (shares)2025
Fiscal YearShares OutstandingChange YoY
202556.41M+3.3%
202454.59M+3.0%
202353.00M+1.0%
202252.46M+61.9%
202132.39M+10.7%
202029.26M+52.5%
201919.19M+11.5%
201817.21M+19.7%
201714.37M
20160