Oura Ring 5 Debuts as World's Smallest Smart Ring Ahead of IPO

Oura, the Finnish-American wearable technology company, has unveiled its latest innovation, the Ring 5, which it claims is the world's smallest smart ring. This new iteration, measuring a mere 2.28mm thick, is 40% smaller than its predecessor and boasts enhanced battery life. The launch comes as the company prepares for a potential Initial Public Offering (IPO) later this year. The Ring 5 aims to integrate comprehensive health-tracking capabilities, typically found in smartwatches, into a more discreet and jewelry-like form factor, focusing on sleep, stress, readiness, and heart health metrics.

"The [Ring 5] is the most capable wearable we’ve ever made – small enough to fit seamlessly into everyday life, and significant enough to set a new standard," stated Holly Shelton, Oura’s chief product officer. The company hopes this fifth-generation device will not only solidify its leading position in the rapidly growing smart ring market but also attract new consumers who may have been hesitant about bulkier wearables or the aesthetic of existing smart rings.

Priced from $399, with a monthly subscription of $5.99, the Ring 5 is scheduled to begin shipping on June 4, 2026. Founded in 2013 in Oulu, Finland, Oura Health Oy has been instrumental in defining the smart ring category. The market saw approximately 4 million devices shipped in 2025, more than doubling annually for the past two years, according to FDM CCS Insight analysts. While still a niche segment compared to the 175 million smartwatches shipped in 2025, smart rings appeal to a broad audience, including smartwatch users, those with traditional watches, and individuals who don't wear watches, with a nearly equal gender distribution, as per CSS Insight consumer research.

Expanding Health Insights and Market Reach

Since its debut on Kickstarter in 2015, where it raised over $650,000, the company, established by former Nokia and Polar engineers, has sold 5.5 million rings across four generations in 150 countries. Oura now boasts approximately 5 million paying subscribers and has experienced a fourfold increase in revenue over the last two years, reaching $1 billion in 2025. This financial growth has led to a valuation of $11 billion ahead of its anticipated IPO. The company's global presence is significant, with an American CEO and over 1,200 employees across offices in Helsinki, London, Los Angeles, San Diego, and dual headquarters in San Francisco and Oulu, where most of its research and development takes place.

Oura has cultivated over 1,200 partnerships in health, wellness, and commercial sectors, collaborating with organizations like the Football Association, the Finnish Olympic team, US Soccer, and the US Open. A core element of Oura's initial success was its emphasis on sleep as a foundational health metric, a focus for which the ring's form factor proved less invasive and more comfortable than many alternative wearables. This commitment to user experience has enabled Oura to carve out a distinct market presence, capitalizing on opportunities overlooked by larger tech companies. The brand has gained traction among high-profile individuals, including Jennifer Aniston, Gwyneth Paltrow, Kim Kardashian, and Prince Harry, adding to its celebrity endorsement and market appeal.

Ben Wood, chief marketing officer at FDM CCS Insight, commented on Oura's strategy: "I think the secret to Oura’s success is a great product with broad appeal and a great experience in the app. Despite the quite significant subscription costs, it feels like you’re getting value with its constant enhancements, and useful and intelligible messages about sleep, your metrics and health." Oura's user engagement data supports this, with 80% of members renewing their subscriptions after the first year and users wearing the rings for an average of 23.5 hours per day, indicating exceptionally high user engagement.

Wood also highlighted Oura's attention to female users: "It’s also one of the few wearables, other than very niche companies, where I feel there is a genuine attempt to reflect the needs of women. Whether it is core body temperature, menopause, cycle tracking or the fit, I think there is a kind of female-first mentality there." In its latest move, Oura is expanding into proactive healthcare. New software features for existing and new rings are being introduced, including a health radar designed to detect potential health issues, such as sleep breathing interruptions, before they become serious. Additionally, the company is incorporating insights related to GLP-1 weight loss injections, allowing users to track dosage and long-term effects.