$75.6 B, Warren Buffett is an American business magnate, investor, and philanthropist. He is considered by some to be one of the most successful investors in the world.

72.8 B, Jeff Bezos is an American technology and retail entrepreneur, investor, and philanthropist.

71.3 B, Amancio Ortega is a Spanish business tycoon. He is the founder and former chairman of Inditex fashion group, best known for its chain of Zara clothing and accessories retail shops.

$56 B, Mark Zuckerberg is an American computer programmer and Internet entrepreneur. He is a co-founder of Facebook, and currently operates as its chairman and chief executive officer.

$54.5 B, Carlos Slim Helu is a Mexican business magnate, investor, and philanthropist.

$52.2 B,Larry Ellison is an American businessman, entrepreneur, and philanthropist who is co-founder of Oracle Corporation and was CEO from its founding until September 2014.

$48.3 B, Charles Koch is an American businessman, political donor and philanthropist. He is co-owner, chairman of the board, and chief executive officer of Koch Industries.

$48.3 B, David Koch is an American businessman, philanthropist, political activist, and chemical engineer.

$47.5 B, Michael Bloomberg is an American businessman, author, politician, and philanthropist.