Oura publicly filed for a U.S. initial public offering on Thursday, advancing plans to list on the Nasdaq Global Select Market under the ticker OURA. Revenue rose 74% to $1.21 billion in the nine months ended June 30, while net loss attributable to stockholders widened to $924.3 million from $182.8 million a year earlier. The filing said the loss reflected a deemed dividend paid to certain holders of redeemable convertible preferred stock. Oura sold about 3.6 million rings during the past year and had more than five million paid subscribers as of June 30. The Oura Ring 5 starts at $399, rising to $499 for premium finishes, while U.S. memberships cost $5.99 monthly or $69.99 annually. Goldman Sachs, Morgan Stanley, JPMorgan Chase, Allen & Co. and Jefferies Financial Group are managing the offering. Bloomberg has reported the deal could raise as much as $3 billion for Oura and certain investors at a valuation above $16 billion. Fidelity Management and Research, Forerunner Ventures, Bedford Ridge Capital and Lifeline Ventures each hold stakes of at least 5%. Oura also faces a proposed class-action lawsuit over the accuracy of its sleep-stage estimates, which it disputes.