Last year, the magazine put him at position 14. The 11-spot jump was due to Nintendo's skyrocketing stock value, stock that Yamauchi still owns a lot of. Yamauchi retired from Nintendo in June 2005 after 55 years at the company.
Yamauchi isn't that far behind the two front runners: Akira Mori, a real estate mogul; and Masayoshi Son, chair of Japan's number three wireless service provider. Both have a net worth of near $5.5 billion each.