Marissa Mayer
Marissa has made her billions by bouncing around information and technology and high tech companies. She is now estimated to have $1.1 billion. This is all due to her very good investment decisions. Marissa graduated from Stanford University and was the first female engineer who worked for Google. She, later on, became the CEO and President of Yahoo. With her at the helm, Yahoo purchased Tumblr. Her stint at Google as one of its first employees boosted her credibility and helped her in terms of stock options.
Caroline Hagen Kjos
Caroline is definitely one of the hard-working billionaires on this list. She has earned her $2.5 billion net worth through hard work as the chairman of Canica AS, her family’s company. She currently holds 97.5% of the company shares. The company has now grown to become the mother company of the smaller business of discount grocery stores in Sweden which was managed by her father and grandfather. With her heading the company, it has purchased other stores and has expanded to what is now known as Canica AS.