DAVID FILO $4.3 BILLION  SELF-MADE SCORE: * SOURCE: YAHOO AGE: 53 RESIDENCE: PALO ALTO, CA

PHILANTHROPY SCORE:

Filo and Jerry Yang (No. 333) dropped out of Stanford’s Ph.D. program to start Yahoo in 1994. After plenty of nights at the office in

the early days, they built it into an internet giant, once worth $125 billion. But that was a long time ago; its core business was sold to Verizon for $5 billion in 2016. The rest of Yahoo, notably a stake in Chinese internet company Alibaba, was renamed Altaba; Filo owns a 6% stake. Altaba shareholders voted to liquidate in June, and the company plans to sell its remaining Alibaba shares in 2020.