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MediaMath Rank: 69 MediaMath CEO Joe Zawadzki describes the company’s software as a Bloomberg Terminal for marketers, where they can buy targeted ads online, across mobile, social and video platforms. Its software, the TerminalOne Marketing Operating System, does for advertisers what was once done by dialing numbers for publishers. “People are realizing that, instead of doing this stuff manually, they can now achieve 10, 50, 100 times better performance,” Mr. Zawadzki said. More than 5,000 brands, including eBay and L.L. Bean, have signed up. MediaMath attributes its 134% growth between 2012 and 2013 to scaling its existing clients across more media channels. This year, it opened offices in Paris, Singapore, Tokyo and Sydney. It acquired French cross-device targeting company Tactads, U.K.-based social-advertising firm Upcast, and Bellevue, Wash.-based targeted media-solutions company Rare Crowds, with more acquisitions to come. —Nazish Dholakia