Determining the single wealthiest Harvard University graduate involves tracking vast private fortunes, corporate equities, and investment portfolios among billionaire alumni. Prominent contenders for this distinction include former Microsoft CEO Steve Ballmer, whose massive net worth stems largely from his early equity stakes in Microsoft and ownership of the Los Angeles Clippers, and wealthy hedge fund founders like Ken Griffin. These individuals possess multi-billion-dollar fortunes that place them among the wealthiest people in the world, reflecting Harvard's powerful business network.