Bill Gates has been on No.2 in the list of Billionaires since 2007 but has regained the No.1 spot ahead of Mexican billionaire Carlos Slim Helu after Microsoft share up 28% so far this year, closed at a Five year high Thursday for the second time this week. Bill Gates is the co founder of Tech giant Microsoft. Slim Helu's American movil,a telecom company recently dropped its stock price, slashing the Billionaires net wirth by $3 billion, giving Bill Gates a chance at the No.1 Spot again.