Penurious Penguin writes "CNET and the Wall Street Journal in correspondence with Chevron representatives reveal that back in 2010, Stuxnet did reach Chevron, where it managed to infect, but not significantly affect their network. The issue was, according one Chevron rep, "immediately addressed" and "without incident". Chevron's general manager of the earth sciences department, Mark Koelmel, said to the CIO Journal:
"Link to Original Source
"I don't think the U.S. government even realized how far it had spread," ... "I think the downside of what they did is going to be far worse than what they actually accomplished."