Most investors are no doubt familiar with Bill Gates, billionaire philanthropist and co-founder of (NASDAQ: MSFT). After helming the technology company for a quarter of a century, the chief executive stepped down to spend more time on his charitable endeavors. Since then, Gates has grown his wealth and is now worth an estimated $127.7 billion, according to Forbes, making him the seventh-richest person in the world.

Gates' charitable efforts are mostly focused on the Bill Melinda Gates Foundation Trust. The mission of the Trust is "to create a world where every person has the opportunity to live a healthy, productive life." The foundation has spent nearly $54 billion since 2000, "taking on the toughest, most important problems." As a result, the Trust's holdings are in a constant state of flux. While it holds stakes in dozens of companies, four well-known stocks dominate the list.

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Source Fool.com