Tenable launched its initial public offering (IPO) today with plans to raise upwards of $288 million. This puts it on track to be the largest U.S. security IPO in the last five years, according to the company.

Tenable shares started trading on the Nasdaq under the ticker symbol TENB early this morning. The company offered 10.9 million shares of common stock at a price of $23 per share. The underwriters have the option to buy another 1.635 million shares. Tenable expects the offering to close on July 30.

The $23-share price is the third increase since the Columbia, Maryland-based company first filed for an IPO in June.

Founded in 2002, Tenable now has more 24,000 customers in 20 countries. It claims 53 percent of the Fortune 500 and 29 percent of the Global 2000 use its security software. The company raised almost $310 million in four earlier funding rounds.

While it’s not the first security firm to go public this year, at $288 million it would be the most profitable. Zscaler and Carbon Black also completed successful IPOs with Zscaler raising $192 million and Carbon Black raising $152 million.

“We think Tenable could be headed to Unicorn status, given its financials, improving profitability, and strong investor demand for cybersecurity firms,” wrote Rohit Kulkarni, managing director, private investment research for SharesPost Research.