Amazon Founder and CEO Jeff Bezos' ex-wife MacKenzie Bezos has officially become the world's third-richest woman with a net worth of $37 billion. Jeff Bezos transferred a 4% stake in Amazon to 49-year-old MacKenzie as part of their divorce settlement, making her the company's second-largest individual shareholder. He retains 12% stake worth $110 billion and remains the world's wealthiest person.