top 10 - Rob walton Rob Walton, 75, was worth about $54.1 billion on March 18, according to Forbes. Walton is the eldest son of the founder of Walmart , Sam Walton, and served as the chairman of the company from 1992 until 2015. top 9 - Alice walton Alice Walton, 70, was worth $54.4 billion on March 18. She is Sam Walton's only daughter and is also the richest woman on the 2 020 list. top 8 - Jim walton Jim Walton, 71, was the richest Walton on March 18 with a net worth of $54.6 billion. Jim Walton gave away $1.2 billion in Walmart in June last year, but kept his wealth because of a 44 percent stake in Arvest Bank. top 7 - Mark zuckerberg Mark Zuckerberg , 35, was worth $54.7 billion on March 18. Zuckerberg founded social media site Facebook in 2004. top 6 - Amancio Ortega Amancio Ortega, 84, was the wealthiest clothing retailer in the world on March 18, with a net worth of $55.1 billion, accordi...