Hilton Worldwide Holdings Inc., formerly Hilton Hotels Corporation, is an American multinational hospitality company that manages and franchises a broad portfolio of hotels and resorts. Founded by Conrad Hilton in 1919, the corporation is now led by Christopher J. Nassetta. Hilton is headquartered in Tysons Corner, Virginia. As of December 2017, its portfolio includes more than 5,200 properties (including timeshare properties) with over 856,000 rooms in 105 countries and territories. Prior to their December 2013 IPO, Hilton was ranked as the 36th largest privately held company in the United States by Forbes. Hilton has 14 brands across different market segments, including Conrad Hotels & Resorts, Canopy by Hilton, Curio - A Collection by Hilton, Hilton Hotels & Resorts, DoubleTree by Hilton, Embassy Suites Hotels, Hilton Garden Inn, Hampton by Hilton, Homewood Suites by Hilton, Home2 Suites by Hilton, Hilton Grand Vacations and Waldorf Astoria Hotels & Resorts, Tru by Hilton, and Tapestry Collection by Hilton. On December 12, 2013, Hilton again became a public company, raising an estimated $2.35 billion in its second IPO. At the time, The Blackstone Group held a 45.8 percent stake in the company. In October 2016, HNA Group agreed to acquire a 25 percent equity interest in Hilton from Blackstone. The transaction was expected to close in the first quarter of 2017. Hilton's largest stockholders are HNA Group, Blackstone, and Wellington Management Group, which own 25%, 15.2%, and 6.7% of Hilton common stock respectively.