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Oura

Smart ring that scores sleep, readiness and stress, sold with an app subscription.

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Oura makes a finger ring with sensors that feed a phone app tracking sleep, activity, stress and more than 50 other health metrics, with extra insights behind a membership. Founded in Oulu, it has sold over 5.5 million rings since 2015. A Series E of more than USD 900 million, led by Fidelity in October 2025, valued the company at about USD 11 billion.

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