Over the past decade, five big technology companies morphed into five great technology empires.

香蕉视频苹果下载The stock market values this group—Apple Inc., Microsoft Corp., Amazon.com Inc., Google parent Alphabet Inc., and Facebook Inc.—at more than $4 trillion, while the six surviving men behind four of those companies are together worth nearly $450 billion, according to Forbes. Both valuations have quintupled since “Avatar” was in theaters.

...