Amy Wyss – $2 Billion
Amy’s father, Hansjoerg, is the founder of Synthes, a medical equipment firm. Amy worked with the company for some time before the company was acquired by Johnson & Johnson back in 2012 for $20 billion (both cash and stocks). She benefited from the sale but the amount she earned at the time was not revealed. However, the world got a little peek into her fortune when the US government decided to investigate an offshore tax evasion scheme. At least, the Wyss family was not implicated in the case.

Amy Wyss 2 Billion Dollars
Maggie Hardy Knox – $2.9 Billion
Maggie Hardy Knox (previously known as Maggie Magerko), is currently the owner of 84 Lumber, the largest privately-owned building material supplier through the US. The company was founded by her father, Joe Hardy, in 1956 in Eighty-Four, Pennsylvania. Maggie got the company from her father in 1992 at the age of 26. The company went through a rough patch during the recession in 2009 but Maggie was able to stand her ground and keep the company going. She managed to sign some amazing deals with major companies like Lowes and Home Depot.

Maggie Hardy Knox 2 Point 9 Billion Dollars