Videoconferencing software company Zoom made its debut Thursday on the Nasdaq under the ticker symbol "ZM," surging 80% to $65 and closing out the day up 72% at $62.

At that price Zoom had a stock market value of $15.9 billion. Zoom is among a growing crop of tech companies going public in 2019, but with a twist: it's profitable.

After filing to go public on March 22, Zoom estimated two weeks later that it would price shares in the range of $28 to $32. Zoom increased the range to between $32 and $35 this week, and on Wednesday it priced above the top of that range, valuing the company at $9.2 billion.

"This was a common question ... 'Why do you focus on profitability?'" Zoom CEO Eric Yuan said of IPO roadshow conversations in an interview with CNBC on Thursday.