Oura is the world’s first wellness ring and mobile app that tracks sleep, activity, and physiological responses in your body. It enables you to learn how your lifestyle choices affect your sleep, and how the quality of your sleep affects your ability to perform.

Oura has raised a follow-on $28M Series B from Forerunner Ventures, Square, and Google's Gradient Ventures, and then a Series C round of $100M (total funding of $148M)