Spero Therapeutics (SPRO) - Shares outstanding

Number of shares outstanding as of December 2025 : 56,026,767

According to Spero Therapeutics's latest financial reports and stock price the company's current number of shares outstanding is 56,026,767. At the end of 2025 the company had 56,026,767 shares outstanding. The number of outstanding shares is usually impacted by stock plits and shares buy back.

Shares outstanding history for Spero Therapeutics from 2016 to 2025

Shares Outstanding at the end of each year

Year	Shares Outstanding	Change
2025	56.02 M	2.73%
2024	54.53 M	3.47%
2023	52.71 M	8.2%
2022	48.71 M	51.61%
2021	32.13 M	17.4%
2020	27.36 M	43.65%
2019	19.05 M	7.42%
2018	17.73 M	91.26%
2017	9.27 M	40.41%
2016	6.6 M

Shares Outstanding for similar companies or competitors

Company	Shares Outstanding	differencediff.	Country
Franklin Covey FC	12,623,000	-77.47%	🇺🇸 USA
IBM IBM	933,900,000	1,566.88%	🇺🇸 USA
Thomson Reuters TRI	449,783,419	702.80%	🇨🇦 Canada

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

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Number of shares outstanding for Spero Therapeutics (SPRO)

Number of shares outstanding as of December 2025 : 56,026,767