9. Katharina Liebherr
Worth: $3 billion
Katharina Liebherr inherited her father's vast fortune and the controlling stake in Southampton football club after the unexpected death of her father back in 2010.
Until recently, she has been able to sit on her shares in the Saints without doing anything. But following the resignation of chairman Nicola Cortese, who was hired by her father Markus, she has had to step up.
She has since named Ralph Krueger as chairman and has declared that she has no intention of selling the club in the near future.