Steve Ballmer — $105 Billion

Former Microsoft CEO Steve Ballmer's net worth reached approximately $105 billion in 2025, underpinned by his massive Microsoft stake which surged with the company's AI-driven growth and its deep partnership with OpenAI. Ballmer, who also owns the Los Angeles Clippers NBA franchise, was an outspoken commentator on corporate governance, philanthropy, and public policy. His USAFacts initiative grew into one of the most widely cited nonpartisan government data resources in the United States.