Oura, the Finnish maker of the smart ring, has successfully closed a $200 million funding round, elevating its valuation to $5.2 billion. The Oura Ring, which has sold over 2.5 million units, is known for tracking sleep, heart rate, and body temperature, and has gained popularity among celebrities such as Gwyneth Paltrow and Prince Harry. This year, it has emerged as a sought-after gift, combining technology and wellness in a compact form. The funding news was first reported by TechCrunch.