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Fortune
Fortune
Prarthana Prakash

Finland's Oura went from a tiny Kickstarter campaign to a $5.2-billion start-up with Cristiano Ronaldo and Prince Harry among its fans

Tom Hale, CEO, Oura speaking on stage (Credit: Shauna Clinton—Sportsfile for Web Summit/Getty Images)

Mark Zuckerberg, Cristiano Ronaldo, Jennifer Aniston, and Prince Harry have one thing in common: They all own Oura Rings.

The Finnish company Oura, founded in 2013, is on the verge of a growth spurt as its niche innovation in wearable tech heads for the mainstream. Demand has boomed recently, with sales set to double this year and nearing the $500 million mark. 

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