15. Elaine Marshall – Net Worth: $9.2 Billion

This 72 year old American billionaire owns 15 percent of Koch Industries in trusts for herself, her two sons and other family members. She inherited it from her husband E. Pierce Marshall, son of J. Howard Marshall II. J. Howard Marshall got the Koch stake by investing in a refinery business that was acquired by Koch Industries. The family is spending millions on lawyers, thanks to J. Howard Marshall II’s financial and romantic adventures. Elaine resides in Dallas-Fort Worth.

14. Massimiliana Landini Aleotti – $10.4 Billion

Although the inheritance is not yet completed, Massimiliana Landini Aleotti and her three children are set to inherit pharmaceutical giant Menarini from her late husband, Alberto Aleotti, who passed away in May 2014 at age 91.

13. Charlene de Carvalho-Heineken – 11.6 Billion

This Dutch billionaire inherited 25 percent controlling stake in the world famous brewer that carries her name. She inherited Dutch brewer Heineken from her late father, Freddy Heineken.

12. Gina Rinehart – $12.6 Billion

This Australian billionaire is the richest person in Australia. She is also the highest taxpayer in Australia. Her wealth comes from iron ore and coal projects in western and northern Australia. Rinehart inherited the Hancock Prospecting from her late father, Lang Hancock.

11. Abigail Johnson – $13.4 Billion

This American billionaire is the president of Fidelity Financial Services. Fidelity is the second largest mutual fund company in the US. Her grandfather Edward Johnson II founded the company in 1946. She started at the family firm before even beginning college.