18. Maria Elisabeth Schaeffler, 63, from Germany (6.7 Billion)
Maria and her son Georg are the owners of�Schaeffler Group, one of the world’s largest producers of�rolling bearings. Since taking over, after her husband’s death, Maria has tripled the value of the company.
17. Margarita Louis-Dreyfus, 52, from Switzerland ($8.4 Billion)
Margarita met her husband on a flight from Zurich to London. She inherited the Louis-Dreyfus company after his death. This company is involved in telecommunications, agriculture, oil, energy, real estate, as well as international shipping.
16. Blair Parry-Okenden, 64, from USA ($8.5 Billion)
Blair is an American billionaire heiress living in Scone, Australia. She has very little to do with the company founded by her grandfather, James M. Cox — a media company, Cox Enterprises. Her Aunt, Anne Cox Chambers sits at number 7 on this list.
15. Carrie Perrodo, 64, from France ($8.8 Billion)
Carrie Wong is a former model from Singapore. She is the owner of the oil group�Perenco.�This is a company which she co-founded with her husband, Hubert who died in 2006.
14. Massimiliana Landini Aleotti, 72, from Italy ($10.4 Billion)
New to the list is Massimiliana Landini Aleotti, inheriting $10.4 billion as of July 2015, when her husband’s estate was finalised. Her husband owned the Menarini pharmaceutical company, a global company founded in Italy.
13. Charlene de Carvalho-Heineken, 61, from Netherlands ($11.6 Billion)
She is the owner of the world’s third-largest�brewer, Heineken International. The company was started by her father Freddy Heineken, and Lucille Cummins. She is the richest person in the Netherlands.

Hi, thanks for bringing that up! It’s 160°C. Give us a min to rectify this oversight so it won’t confuse…