6. Abigail Johnson

Net Worth: $15 billion*
Wealth Inherited From: Fidelity Investments

Abigail Johnson is a billionaire business magnate and the CEO of Fidelity Investments since 2014. She is also the chairwoman of Fidelity International, Fidelity’s sister company. With a net worth of $15 billion and growing, Johnson attained her education at Harvard before beginning her career at a low-level position at Fidelity.

She advanced gradually and eventually took her father’s place. It was her grandpa who established the investment company. Johnson is wed to Christopher McKown, the chief executive of a financial enterprise (Force Financial), and they have a single offspring.