Federal spending is a top driver of business activity, so it should come as no surprise that the possibility of a government shutdown over spending cuts is a front-and-center issue for analysts and the media.

The topic becomes additionally worrisome for a number of companies who largely or fully depend on government contracts and subsidies to make ends meet or turn a profit.

CNBC reports that according to USASpending.gov in 2010 there were $536.7 billion in government contracts awarded to approximately 303,000 contractors.

The data presented here are based solely on U.S. government contracts and do not include assistance, insurance, grants, loans, or other forms of payment.