Forbes on Monday released its annual list of the top 400 richest Americans. Six Oklahomans are on the list.
Harold Hamm, 67, CEO of Continental Resources in Oklahoma City is the top Oklahoman with a net worth of $12 billion.
He is followed by Tulsan George Kaiser, 71, Chairman of BOK Financial with a net worth of $10 billion.
Other Oklahomans on the list include:
Microsoft co-founder Bill Gates remains America's richest man, taking the top spot on the list for the 20th straight year, with a net worth of $72 billion.
Investor Warren Buffett, the head of Berkshire Hathaway, posted another distant second place finish with $58.5 billion. Oracle Corp. co-founder Larry Ellison stayed third with $41 billion.
Brothers Charles and David Koch, co-owners of Koch Industries, stay tied for fourth with $36 billion each.
Wal-Mart heirs Christy Walton, Jim Walton, Alice Walton and S. Robson Walton took the next four spots, with holdings ranging from $33.3 billion to $35.4 billion.
According to Forbes, 273 members of the list are self-made billionaires, while 71 inherited their wealth and another 56 inherited at least some of their money.
The Associated Press contributed to this report.