Not to contradict DD, but Google (Dallas), HP (Houston) and Toshiba (Houston) have rather sizable presences here in Texas. Also, Microsoft has a large enclave just a few miles from my house - and if they purchase Dell, which was in the news today, that'll give them a large presence outside of Austin.
Not sure how many large Texas companies have presences in or are buying companies based in California. Not saying they don't exist, just that I dont know of any.
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