Oura has held a strong position in the smart ring market for years, but that leadership is now being tested. A growing number of rival companies are entering the space with different approaches, each trying to find ways to compete with Oura's established product and user base.

The company's move to go public comes at a time when the smart ring category itself is attracting more attention from both new entrants and established tech players looking to capture a slice of this emerging wearable market.