Warren Buffett does not own The Vanguard Group, as the firm operates under a unique client-owned mutual structure where the funds themselves own the company rather than outside corporate entities or individual billionaires. While Berkshire Hathaway does not own Vanguard, Warren Buffett has frequently and publicly praised Vanguard's founder, Jack Bogle, and has often recommended low-cost Vanguard S&P 500 index funds as the ideal investment vehicle for everyday retail and retirement investors.