Airbnb raises $1.5 billion, valuing it at an eye-popping $25.5 billion by Andrew Nusca @FortuneMagazine June 27, 2015, 11:36 AM EDT E-mail Tweet Facebook Google Plus Linkedin Share icons The pace of the race to the top of Fortune‘s Unicorn List continues to hasten as startups raise ever-larger sums of money to fuel growth and expansion. Airbnb, the well-known home rental service headquartered in San Francisco, has closed a new $1.5 billion funding round, according to reports from the Wall Street Journal and Financial Times. The round, which has been rumored for weeks, values the company at $25.5 billion—billions more than publicly traded neighbor Twitter TWTR , which had raised far less ahead of its highly anticipated 2013 IPO, and hotel giant Marriott MAR , which runs more than 4,000 properties around the globe. At the time of its previous investment earlier this year, investors valued Airbnb at $20 billion. Among venture-backed startups, only Chinese phonemaker Xiaomi and car-hailing service Uber carry higher valuations. Investors backing the young company this time reportedly include General Atlantic, Hillhouse Capital Group, Tiger Global Management, Kleiner Perkins Caufield & Byers, GGV Capital, China Broadband Capital, and Horizon Ventures. “Airbnb is like a giant ship,” CEO Brian Chesky told Fortune‘s Leigh Gallagher in her recent feature story on the 33-year-old chief executive. “As CEO I’m the captain of the ship.” With the additional funds, Chesky just got a little more wind in his sails. Want more? Read Fortune’s complete coverage of Airbnb. Sign up for Data Sheet, Fortune’s daily newsletter about the business of technology.