Oura Ring 5 is introduced as the smallest smart ring in the world, priced at $399.

      TL;DR: Oura has introduced the Ring 5, a smart ring that is 40% smaller than the previous model, measuring 6.09mm in width. It features blood pressure pattern detection and AI-powered Health Radar monitoring. The starting price is $399, with shipments beginning on June 4, as Oura prepares for a US IPO valued at $11 billion.

      Oura has unveiled the Ring 5, a smart ring 40% smaller than its predecessor, making it the smallest smart ring on the market at 6.09mm wide and 2.29mm thick. Depending on size, it weighs as little as 2 grams, down from the Ring 4’s 7.99mm width and 2.88mm thickness. Despite its reduced size, Oura claims that the Ring 5 maintains the same sensor precision and offers a battery life of up to nine days.

      “We have finally achieved what I believe is a significant technological breakthrough,” CEO Tom Hale told CNBC. “This is what our users have been requesting for years.” The Ring 5 is available for preorder now, priced at $399 for black and silver finishes, and $499 for gold, stealth, brushed silver, and deep rose. Shipping starts on June 4. An Oura membership is required, costing $5.99 monthly or $69.99 annually.

      Blood Pressure Signals and AI Health Monitoring

      The Ring 5 introduces Health Radar, an AI-driven monitoring system that continuously observes biometric signals such as body temperature, respiratory rate, and heart rate variability in the background. When Health Radar identifies patterns indicating potential strain, it alerts the wearer. Oura has built its reputation on passive health tracking that operates without screens or notifications, and Health Radar enhances this with predictive features.

      The most significant addition is Blood Pressure Signals, which recognizes shifts and patterns that could suggest cardiovascular strain. The ring does not directly measure blood pressure, which is an important distinction; instead, it monitors biometric patterns that correlate with increasing blood pressure and notifies users when it identifies concerning trends. This feature positions Oura within the expanding market of continuous cardiovascular monitoring, alongside companies developing cuffless blood pressure measurement for wrist devices.

      A Nighttime Breathing feature offers a 30-day rolling overview of sleep-related breathing patterns and disturbances, providing users with data that may prompt discussions with a doctor regarding conditions like sleep apnea. Oura is also incorporating GLP-1 insights, which track weight and body changes for members using GLP-1 medications like Ozempic and Wegovy, offering a longitudinal perspective on their treatment journey.

      A Company Approaching Public Markets

      The launch of Ring 5 is crucial for Oura at this time. The company has confidentially filed for a US IPO, valued at around $11 billion following a $900 million Series E funding round led by Fidelity in late 2025. The total funding raised is approximately $1.5 billion, with support from ICONIQ, Whale Rock, and Atreides. Oura has also secured a $250 million revolving credit facility from a number of major financial institutions, including JPMorgan and Goldman Sachs.

      The financial growth trajectory is ambitious. Oura reported over $500 million in revenue for 2024, doubling that to about $1 billion in 2025, with Hale indicating the company could approach $2 billion in sales by 2026. The Ring 5 is intended to boost this growth by addressing the most frequent complaint from current users: the ring's thickness.

      The Smart Ring Market is Becoming Crowded

      Oura initially established the smart ring category but is no longer the sole player. Samsung has launched the Galaxy Ring, priced at $399 to compete with Oura, integrating it with the Samsung Health ecosystem. The Galaxy Ring weighs as little as 2.3 grams and has gained popularity among users who find smartwatches cumbersome for sleep tracking. Although Apple has not released a smart ring, it is reportedly exploring the concept, with CCS Insight forecasting the possibility of an Apple Ring by 2026.

      Wearable fitness trackers have progressed from simple step counters to advanced medical monitoring devices, and smart rings like Oura sit at the crossroads of convenience and clinical aspiration. This category is appealing to users who desire continuous health data without a screen on their wrist, and the smaller size of the Ring 5 aims to enhance this balance.

      For Oura, the Ring 5 serves as both a product launch and a pre-IPO statement. The introduction of a smaller, more capable ring alongside an IPO filing suggests that the company believes it can maintain its growth rate in the public market. The health wearable sector is becoming increasingly competitive, but Oura's strategy is predicated on the idea that the ring form factor, coupled with AI-driven health insights, provides it with a competitive edge over watches and bands.