4 & 3) Don and Bubba Cathy (Net worth: $3.2 billion each)

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Don and Bubba Cathy are brothers. They are the sons of Samuel Truett Cathy. Samuel is the founder of Chick-fil-A, an American fast food restaurant chain that specializes in chicken sandwiches. Dan is the CEO of the company. Bubba is the senior vice president of Chick-fil-A and the president of Dwarf House.

2) Elizabeth Holmes (Net worth: $4.5 billion)

Elizabeth Holmes is the youngest self-made woman billionaire. This 31-year-old entrepreneur is the founder of blood testing company Theranos. The company is currently valued at $9 billion. Holmes, who is a Stanford University dropout, owns half of Theranos today.