Sept 29 : Oura has delayed its US initial public offering, the smart ring maker said on Tuesday, citing market uncertainty and denting hopes for a pickup in the traditionally strong fall listings window.The US IPO market has hit a bump after a strong start to the year, as investors grapple with concerns that the AI trade has run its course, the Federal Reserve's interest-rate hike and geopolitical turmoil.The consumer technology company and some of its existing investors had marketed 50 million shares in the offering priced in an indicated range of $40 to $44 apiece.At the top of the indicated range, Oura would have raised $2.2 billion at a fully diluted valuation of $15.62 billion.Show MoreShow LessThe company, founded more than a decade ago in Finland, reached a valuation of about $11 billion in a late-stage funding round last year.IPOs typically require stable investor appetite and supportive market conditions for companies to achieve their desired valuations.TIMING THE MARKETThe offering would have been the first sizable fall market US IPO since the traditional summer lull, with analysts viewing Oura's debut as a key test of investor appetite for high-growth companies.Earlier this month, nuclear services company Holtec suspended its planned US IPO amid increased scrutiny of vast capital being deployed in sectors related to AI."We aim to deliver an extraordinary IPO for our employees and investors and we have the luxury of choosing our moment. In the meantime, we will execute against the opportunities ahead," Oura CEO Tom Hale said in a statement.The company said it was profitable and forecast revenue to jump 90 per cent in fiscal 2026 from a year earlier.Oura has helped popularize smart rings, which track metrics such as heart health, activity and sleep.It added that the response to the launch of its flagship Oura Ring 5 has been "exceptionally strong," bringing the number of paid members on its platform to 5.7 million.Smart rings are carving out a niche between traditional fitness trackers and smartwatches, offering personalized health insights in a smaller, screen-free form that can be worn around the clock and typically has longer battery life.