No. 12: Huawei Technologies
Headquarters: Shenzhen, China
Snapshot: IDC ranks Huawei as the 12th largest server maker on the planet, but it's also the world's largest telecommunications equipment maker. Last year Huawei found itself under a U.S. government microscope for alleged security issues.
According to Bloomberg, Huawei employs about 1,700 people in 14 U.S. offices, and had $1.3 billion in U.S. revenue last year, up from $765 million in 2010.