Oura makes a finger-worn smart ring that tracks sleep, activity, stress, heart health, and women's health, with a companion app and paid membership for the analytics layer. The latest hardware is the Oura Ring 4 and Ring 4 Ceramic, capturing over 20 biometrics from the finger.

Headquartered in Oulu, Finland, with 900+ employees across multiple countries and a 30+ PhD in-house science team. Stated mission is to make health a daily practice.

Over 5.5 million rings sold. Last raised $900 million at an $11 billion valuation.

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