WATU WANAOONGOZA KWA UTAJIRI MAREKANI.

1. WILLIAM H. GATES III

Net Worth: $50 billion

Source: Microsoft

Residence: Medina, Wash.

Age: 53


2. WARREN BUFFETT

Net Worth: $40 billion

Source: Berkshire Hathaway

Residence: Omaha

Age: 79


3. LAWRENCE ELLISON

Net Worth: $27 billion

Source: Oracle

Residence: Redwood City, Calif.

Age: 65


4. CHRISTY WALTON & FAMILY

Net Worth: $21.5 billion

Source: Wal-Mart

Residence: Jackson, Wyo

Age: 54



5. JIM C. WALTON

Net Worth: $19.6 billion

Source: Wal-Mart

Residence: Bentonville, Ark.

Age: 61


6. ALICE WALTON.

Net Worth: $19.3 billion

Source: Wal-Mart

Residence: Fort Worth, Tex.

Age: 60



7. S. ROBSON WALTON

Net Worth: $19 billion

Source: Wal-Mart

Residence: Bentonville, Ark.

Age: 65


8. MICHAEL BLOOMBERG

Net Worth: $17.5 billion

Source: Bloomberg LP

Residence: New York City

Age: 67


9. CHARLES KOCH (tie)

Net Worth: $16 billion

Source: Manufacturing, energy

Residence: Wichita, Kans.

Age: 73



10. DAVID KOCH(tie)

Net Worth: $16 billion

Source: Manufacturing, energy

Residence: New York City

Age: 69