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Eliminating the word "Only" in the title, you get "6 of the 20 largest software companies are in Silicon Valley!"

And no other metro area has more than 1.

Maybe not on that list...but the Seattle area does have Microsoft, Amazon, and Nintendo...all very large companies.

There are 3 in Bangalore metro, 2 in NYC metro and 2 in Dallas metro on the list.

Also Boeing which doesn't sell software but has more programmers and software engineers than most companies that do.