To be fair, there were a number of defendants in that law suit. And they're probably just the ones that got caught.

https://en.wikipedia.org/wiki/High-Tech_Employee_Antitrust_L...

"The defendants are Adobe, Apple Inc., Google, Intel, Intuit, Pixar, Lucasfilm and eBay, all high-technology companies with a principal place of business in the San Francisco–Silicon Valley area of California."