Forbes' richest billionaires list 2015

Bill Gates - $79.2 billion

Bill Gates is the world's richest person, according to Forbes. The former Microsoft chairman is worth $79.2 billion.

Carlos Slim Helu - $77.1 billion

Mexican billionaire telecom executive Carlos Slim is worth $77.1 billion.

Warren Buffett - $72.7 billion

Warren Buffett, the Berkshire Hathaway chairman and chief executive, is worth $72.7 billion.

David Koch - $42.9 billion

David Koch, the Americans for Prosperity Foundation chairman, is worth $42.9 billion.

Charles Koch - $42.9 billion

Charles Koch ties with his brother for sixth richest with $42.9 billion in wealth. Charles and David also serve as co-owners of Koch Industries.

Christy Walton & family - $41.7 billion

Christy Walton, who inherited her wealth from her deceased husband John T. Walton, one of the sons of Sam Walton, the founder of Walmart Stores Inc.

Jim Walton - $40.6 billion

Another heir to the Walmart fortune, Jim Walton is the youngest son of founder Sam Walton and is chairman of Arvest Bank Group.

Liliane Bettencourt & family - $40.1 billion

Heiress to L'Oreal, Liliane Bettencourt is worth $40.1 billion and is one of the principal shareholders for L'Oreal.

Alice Walton - $39.4 billion

Another Walmart-Walton family member, Alice Walton is worth $39.4 billion.

S. Robson Walton - $39.1 billion

The fourth Walmart-Walton family member on the list, S. Robson Walton is worth $39.1 billion, and currently serves as chairman of Walmart.

Bernard Arnault & family - $37.2 billion

Louis Vuitton chairman and CEO Bernard Arnault is worth $37.2 billion. Arnault has served in the position in LVMH since 1989.

Michael Bloomberg - $35.5 billion

Michael Bloomberg, former New York City mayor, is worth $35.5 billion, and receives the majority of his wealth from his financial company Bloomberg LP.

Jeff Bezos - $34.8 billion

Amazon CEO Jeff Bezos is worth $34.8 billion and currently serves as Amazon's CEO. In 2014, Bezos was ranked 21 and worth $27.6 billion.

Mark Zuckerberg - $33.4 billion

Facebook founder and CEO Mark Zuckerberg is worth $33.4 billion, despite receiving an infamous one-dollar salary as the head of Facebook.

Li Ka-shing - $33.3 billion

Hong Kong tycoon Li Ka-shing is worth $33.3 billion and is the richest person in Asia.

Sheldon Adelson - $31.4 billion

Las Vegas Sands Corp. CEO Sheldon Adelson is worth $31.4 billion. His company owns Marina Bay Sands in Singapore and is the parent company of Venetian Macao Limited, which owns The Venetian Resort Hotel Casino and Sands Expo and Convention Center.

Larry Page - $29.7 billion

Google co-founder and CEO Larry Page is worth $29.7 billion.

Sergey Brin - $29.2 billion

The other Google co-founder Sergey Brin is worth $29.2 billion.