Shares of Roku Inc. surged in their trading debut Thursday, a welcome sign for the stalled technology IPO market. Shares of the company, which makes streaming-media devices and software, rose 68% to $23.50, closing at their session high and bringing Roku’s valuation to $2.2 billion. The stock opened at $15.78 and only traded as low as $15.75. Roku’s first-day jump is the biggest this year among all U.S.-listed IPOs that...

Source: Wall Street Journal September 28, 2017 14:44 UTC