226. Mary Alice Dorrance Malone
$3.3 billion @ self-made score: source: campbell soup age: 67 residence: coatesville, Pa. B.a., u. of arizona ’72 The largest individual shareholder of Campbell Soup (with a 17% stake), Malone sits on the company’s board alongside her brother Bennett (No. 302). Her grandfather John T. Dorrance Sr. invented Campbell’s condensed soup formula in 1897, then bought the business from his uncle in 1914. She owns horse-breeding and performance centers in Pennsylvania and Florida.