Abigail Johnson, Massachusetts
Johnson's $14.7 billion net worth comes from wealth management. She is the chairman and CEO of Fidelity Investment, a Boston-based mutual fund giant with $2.7 trillion in assets. She has worked full-time for the company since 1988 and took over the CEO position from her father in 2014.
Daniel Gilbert, Michigan
Gilbert can thank Quicken Loans for his $6.8 billion. He co-founded America's largest online mortgage lender in 1985 and then sold it to Intuit for $532 million in 1999. Then he bought it back three years later for $64 million. He also owns the Cleveland Cavaliers.