#7 – Dona Bertarelli ($3.9 Billion)
Dona Bertarelli was born in Rome, but she is technically a citizen of Switzerland. However, she isn’t really like most other businesswomen. Bertarelli’s greatest passion is sailing, and she is quite good at it. In 2010, her and her team won the Bol d’Or Mirabaud, becoming the first woman to have ever won the race.
In November of 2015, she became the fastest woman to sail around the world. However, her sailing is what ended up landing her on this illustrious list. The majority of her fortune came from her inheritance, when Serono, her family’s business, sold for over $9 billion to Merck KGaA in 2007. Currently, the entrepreneur/athlete resides in Gstaad in Switzerland.