Google has shored up its position at the top of ZenithOptimedia’s list of the top 30 global media owners, extending the gap from No. 2, Walt Disney Company, over the past year. ZenithOptimedia’s report, “Top Thirty Global Media Owners 2015,” which lists the world’s media companies by revenue, ranks Google at 136 percent larger than Disney, up from 115 percent the year before. The media services firm says Google is larger than Disney and third-place Comcast combined.

ZenithOptimedia attributes some of Google’s success to the increasing numbers of smartphones and tablets in consumers’ hands, as they create new opportunities for display ads. It also sees the transition to mobile as having buoyed Facebook, the fastest growing company on the list. Coming in at No. 10, Facebook’s media revenues grew 63 percent over the past year. The second-fastest growing company is Baidu, China’s equivalent of Google, which grew 43 percent last year and is now No. 14 on the list.

“The rapid growth of digital media and emerging ad markets has strengthened the position of media owners such as Google, Facebook, Baidu and Globo, at the expense of traditional media owners in developed markets,” says Jonathan Barnard, ZenithOptimedia’s head of forecasting. “The top digital media owners currently maintain a strong grip on the digital ad market, but they face the constant threat of displacement by disruptive innovators. While some emerging-market media owners face challenges in expanding their businesses in the short term, we expect to see more media owners from emerging markets enter the top 30 over the next few years.”

For more on ZenithOptimedia’s report and its findings, click here.