ZoomInfo Founders become billionaires after company's stock doubles days after IPO

American business-intelligence company ZoomInfo's Co-founders Henry Schuck and Kirk Brown have become billionaires after company's stock more than doubled after its June 4 IPO, Bloomberg reported. The Nasdaq-hosted IPO raised over $900 million. Founded in 2000, ZoomInfo provides access to its database of information about business people and firms to sales, marketing and recruiting professionals.