20 biggest firms in the United States

Wal-Mart Stores has topped Fortune's list of the 500 biggest US companies by revenue.

With robust sales, the company bounced back to the top spot in the Fortune 500 list after slipping to No. 2 last year. 

The 500 largest US companies made a stellar performance with the combined earnings at $820 billion in 2012.

Take a look at the biggest companies in the US...

Wal-Mart Stores

Rank: 1

Revenues: $469.2 billion

Profit: $16,999 million

...

Exxon Mobil

Rank: 2

Revenues: $449.9 billion

Profit: $44,880 million

...

Chevron

Rank: 3

Revenues: $233.9 billion

Profit: $26,179 million

...

Phillips 66

Rank: 4

Revenues: $169.6 billion

Profit: $4,124 million

...

Berkshire Hathaway

Rank: 5

Revenues: $162.5 billion

Profit: $14,824 million

...

Apple Inc

Rank: 6

Revenues: $156.5 billion

Profit: $41,733 million

...

General Motors

Rank: 7

Revenues: $152.3 billion

Profit: $6,188 million

...

General Electric

Rank: 8

Revenues: $146.9 billion

Profit: $13,641 million

... 

Valero Energy

Rank: 9

Revenues: $138.3 billion

Profit: $2,083 million

...

Ford Motor

Rank: 10

Revenues: $134.3 billion

Profit: $5,665 million

...

AT&T

Rank: 11

Revenues: $127.4 billion

Profit: $7,264 million

...

Fannie Mae

Rank: 12

Revenues: $127.2 billion

Profit: $17,220 million

...

CVS Caremark

Rank: 13

Revenues: $123.1 billion

Profit: $3,876.9 million

...

McKesson

Rank: 14

Revenues: $122.7 billion

Profit: $1,403 million

...

Hewlett-Packard

Rank: 15

Revenues: $120.4 billion

Loss: $12,650 million

...

Verizon Communications

Rank: 16

Revenues: $115.8 billion

Profit: $875 million

...

United Health Group

Rank: 17

Revenues: $110.6 billion

Profit: $5,526 million

...

J P Morgan Chase & Co

Rank: 18

Revenues: $108.2 billion

Profit: $21,284 million

...

Cardinal Health

Rank: 19

Revenues: $107.6 billion

Profit: $1,069 million

...

IBM

Rank: 20

Revenues: $104.5 billion

Profit: $16,604 million