Microsoft co-founder slipped a notch on the annual Forbes magazine list even though his fortune actually rose by $13 billion Microsoft co-founder Bill Gates is no longer the world’s richest man according to the annual Forbes magazine list released Tuesday, but it’s not like he’s going to have to go crawling back for his old job either.Mexican telecom tycoon Carlo Slim Helu beat out Gates, last year’s top billionaire, with a fortune worth $53.5 billion. Slim’s rise this past year was fueled by growth in mobile telecom giant America Movil, which saw a 35 percent share price increase over the past year. Slim owns a $23 billion stake in the company, according to Forbes.[ Stay ahead of the key tech business news with InfoWorld’s Today’s Headlines: First Look newsletter. ] Gates, who has refocused his career on charitable endeavors, is now worth $53 billion. While he slipped a notch on the Forbes list, his fortune actually rose by $13 billion on the strength of a climbing Microsoft stock price.Access InfoWorld from your iPhone or other mobile device at infoworldmobile.com . Get the latest tech news on your iPhone with IDG’s ITnews iPhone app .Also read: CEO payday: How much tech chiefs madeInvestor Warren Buffett came in behind Gates at $47 billion. Buffett beat out Gates for the top spot in 2008, snapping a 13-year streak for Gates. Also on the list: Oracle founder and recent America’s Cup sailing champ Larry Ellison, whose fortune is worth $28 billion.Read more about software in Network World’s Software section. Technology Industry