On: Only 6 of the 20 largest software companies are in...

[btw0]

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

[hko → btw0]

And no other metro area has more than 1.

[endtime → hko]

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

[billswift → endtime]

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

[wheels → endtime]

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