Smart ring maker Oura's initial public offering (IPO) has been oversubscribed by approximately four times, amidst a volatile U.S. IPO market. The company and some shareholders plan to issue a total of 50 million shares at a price range of $40 to $44 per share, aiming to raise up to $2.2 billion. At the upper end of the offering price, the company's market capitalization would reach $14.1 billion. The IPO is scheduled to be priced on September 29, and the shares will be listed on the Nasdaq Global Select Market under the ticker symbol "OURA." Underwriting banks are expected to close the order book for investors by Monday afternoon.