Costain Group (COST.L) - Shares outstanding

Number of shares outstanding at the end of 2025: 268,500,000

According to Costain Group's latest financial reports and stock price the company's current number of shares outstanding is 268,500,000. At the end of 2025 the company had 268,500,000 shares outstanding. The number of outstanding shares is usually impacted by stock plits and shares buy back.

Shares outstanding history for Costain Group from 2010 to 2025

Shares Outstanding at the end of each year

Year	Shares Outstanding	Change
2025	0.26 B	-1.03%
2024	0.27 B	-0.84%
2023	0.27 B	-0.51%
2022	0.27 B	0.04%
2021	0.27 B	29.18%
2020	0.21 B	86.14%
2019	0.11 B	1.22%
2018	0.11 B	1.53%
2017	0.11 B	1.85%
2016	0.10 B	1.08%
2015	0.10 B	7.51%
2014	0.10 B	42.68%
2013	70.44 M	1.53%
2012	69.38 M	1.87%
2011	68.1 M	0.94%
2010	67.46 M

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 Costain Group (COST.L)