Subsea 7 operates as a publicly traded corporation listed on the Oslo Stock Exchange, meaning it is collectively owned by thousands of institutional asset management firms, mutual funds, and individual public shareholders rather than a single private individual. However, significant influence and a major core equity stake are held by Siem Industries S.A., an industrial investment holding group associated with prominent shipping entrepreneur Kristian Siem. Institutional investors and diverse public market participants hold the remainder of the shares, ensuring standard corporate governance and market-driven liquidity.