Fortune 1000 rank: 539
Best Companies rank: 83
No. of U.S. employees: 1,181
Most common salaried job (Avg. Pay):
What makes it so great? Oil and gas driller discarded by Enron in 1999 as an old economy business has flourished. Employees get stock options (share price has more than tripled in the past five years), plus bonuses each year.