2 of 10
2. Pfizer
Untaxed foreign profit: $48.2 billion

The health care industry keeps more profits overseas than any other industry, according to Ciesielski. Pfizer, the world's largest drug maker, is among a number of large American companies pushing for a one-year tax holiday on foreign earnings. Along with companies like Apple, Cisco, and Duke Energy, Pfizer is lobbying for a temporary break on the regular corporate tax in order to repatriate its profits and invest more domestically.

Pfizer develops and markets a wide variety of prescription drugs and is best known for its blockbusters like Lipitor and Celebrex. It has grown mostly by acquiring other large pharma companies, including Warner-Lambert, Pharmacia, and Wyeth.

NEXT: Merck
Last updated April 14 2011: 3:59 PM ET
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