The Mars Family — $160 Billion (Mars Inc.)

Frank Mars invented the Milky Way bar in 1923. His grandson John Mars and the family now control Mars Inc. — a $50 billion revenue company that owns M&Ms, Snickers, Twix, Skittles, Wrigley gum, Pedigree pet food, and Royal Canin. Combined family wealth: $160 billion. Mars Inc. is the largest privately held company in America. The family is pathologically private — no interviews, no social media, no public appearances. They're worth more than the Waltons per capita and you've never seen any of their faces. The most powerful invisible family in American capitalism.