Jeff Bezos is officially a single man as he and his ex-wife, MacKenzie, finalized their divorce Thursday. Bezos will keep 75 percent of the couple's Amazon stock, plus voting control. He will remain the world’s wealthiest person. He also gets to take her interests in The Washington Post and the Blue Origin aerospace company. MacKenzie made out well, too, getting $35.6 billion in Amazon stock, making her the fourth-richest woman in the world.