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by akiselev 3424 days ago
It's actually pretty easy but for a first order estimate: http://wolframalpha.com/input/?i=total+2015+revenue+of+Googl...

I'm on mobile so I can't get the interface to work properly but it's much easier on desktop Mathematica or WolframAlpha. In the above figure, I only included names from the OP that I was certain were public after a quick glance and I didn't even get to Microsoft. The number is something like $500 billion a year but as a sibling comment to yours mentions, this includes international revenue that may never make it to the US.

Accurate data on this scale is hard to come by without a working Bloomberg terminal.