1. Apple

2016 revenue: $218.1 billion

2015 revenue: $235 billion

The company's iOS 11, due out this fall, will include changes it says will be useful for users of both the iPhone and iPad, such as Siri upgrades and interface improvements. In May, CEO Tim Cook said Apple will continue to invest in its desktop computer line. "We're investing aggressively in its future, and we're very excited about the innovation we can bring to the platform," Cook told analysts on the company's most recent quarterly earnings call.