Buoyed by public markets, the average net worth of America's 400 richest people has risen by $800 million to a record $5 billion as of September 2013, according to Forbes.
Take a look at the richest people in America.
10. Michael Bloomberg, New York City mayor. Net worth: $31 billion.
9. S. Robson Walton, son of Walmart Stores Inc founder Sam Walton and chairman of Walmart. Net worth: $33.3 billion.
8. Alice Walton (pictured with brothers Rob and Jim), Chairman, Crystal Bridges Museum of American Art. Net worth: $33.5 billion.
7. Jim Walton, chairman and chief executive officer of Arvest Bank Group Inc. Net worth: $33.8 billion.
6. Christy Walton & family, WalMart heiress. Net worth: $35.4 billion.
4. David Koch (tie), along with brother Charles, David is co-owner and executive vice president of Koch Industries. Net worth: $36 billion.
4. Charles Koch (tie), along with brother David, Charles is co-owner and executive vice president of Koch Industries. Net worth: $36 billion.
3. Larry Ellison, CEO of Oracle. Net worth: $41 billion.
2. Warren Buffett, CEO of Berkshire Hathaway. Net worth: $58.5 billion.
1. Bill Gates, chairman and co-founder of Microsoft Corp., is also co-chairman of the Bill & Melinda Gates Foundation. Net worth: $72 billion.
To read more about the wealthiest Americans, go to Forbes.com.