Former Microsoft CEO Steve Ballmer has surpassed Bill Gates in wealth, marking the first time the company co-founder has been eclipsed by a former colleague. Ballmer's net worth, estimated at $157.2 billion, has seen a significant rise, placing him at sixth on the Bloomberg Billionaires Index, while Gates' net worth stands at $156.7 billion. Gates' wealth has been impacted by his divorce and philanthropic efforts, particularly through the Gates Foundation. Ballmer's fortune is primarily tied to Microsoft, where he owns a 4% stake and benefits from the company's success in artificial intelligence. Gates, on the other hand, holds significant shares in Microsoft and Cascade Investment, with interests in various industries. Despite their different paths, both men have made significant contributions to Microsoft's success and the tech industry as a whole.