Finnish smart ring maker Oura has confidentially filed for a U.S. IPO, aiming to list on the stock market with a valuation of $11 billion. The company submitted a Form S-1 to the U.S. Securities and Exchange Commission, marking the initial steps towards its public offering. Details on the fundraising amount and timeline remain undisclosed. Oura's valuation surged following a Series E funding round in September last year, where it raised $875 million. The company has sold 5.5 million smart rings to date, reflecting significant growth from the previous year's 2.5 million units. Additionally, Oura has launched an AI model focused on women's health, expanding its product offerings beyond hardware to include AI-driven health services.