Oura Inc.'s initial public offering has attracted orders for roughly four times the shares available, people familiar with the matter said. The company and selling shareholders are offering 50 million shares at $40 to $44 each, potentially raising as much as $2.2 billion. Oura plans to sell 13.5 million shares, while Forerunner Ventures, Lifeline Ventures and other shareholders will offer 36.5 million. At the top of the range, Oura would be valued at $14.1 billion based on outstanding shares, or about $15 billion on a fully diluted basis. The IPO is scheduled to price Sept. 29, with trading expected on the Nasdaq Global Select Market under OURA, although terms could change.