Ronald Gerald Wayne (born 17 May, 1934) founded Apple Computer (now Apple Inc.) on 1 April 1976 with Steve Wozniak and the late Steve Jobs and at the time held a 10% stake. Wayne relinguished his stock for US$800.00 less than two weeks later, on 13 April 1976.
Later that year, venture capitalist Arthur Rock and Mike Markkula helped develop a business plan and convert the partnership to a corporation. Wayne received a further payment of US$1,500 for his agreement to forfeit any claims against the new company, hence Wayne received a total of US$2300.00 for his share.
Had Ronald Gerald Wayne held his 10% share it would be worth approximately US$56, 500, 000, 000.00 (YES, that is US$56.5 Billion) as of today.
Source: Wikipedia