Marijke Mars net worth: Marijke Mars is an American billionaire heiress and businesswoman who has a net worth of $6 billion. Marijke Mars was born in 1965. She is best known for being a member of the Mars family. Marijke Mars is a fourth generation member of the family. Her father was Forrest Mars Jr. and her three sisters are Pamela Mars-Wright, Valerie Mars, and Victoria B. Mars. In 2016 she inherited about 8% of Mars Inc. which made her a billionaire. Marijke Mars graduated from Duke University and was a regional manager for Kal Kan Foods which is a pet food company owned by Mars, Inc. She later worked at Mars Food. Mars was founded in 1911 and posted a revenue of $35 billion in 2017. The company's products include 3 Musketeers, Dove, M&M's, Milky Way, Snickers, Twix, Uncle Ben's Rice, several pet products, and products manufactured by The Wrigley Company.