Subsea 7 does not have a single private owner, as it functions as a publicly traded corporation listed on the Oslo Stock Exchange, meaning its equity is collectively owned by thousands of institutional asset management firms, mutual funds, and retail shareholders. However, significant influence and a major controlling equity stake are held by Siem Industries S.A., an industrial holding group associated with prominent shipping entrepreneur Kristian Siem. Other substantial institutional shareholders, such as large global financial funds and Norwegian investment entities, hold the remaining shares while maintaining standard corporate governance oversight.