What do you do with your money when you’re one of the world’s wealthiest individuals? Bill Gates has amassed a net worth upwards of $91 billion as of 2018. Gates earned the majority of his vast fortune as one of the founders of Microsoft Corporation (MSFT

) , where he served as CEO, chairman, and chief software architect. Gates was the largest individual shareholder of Microsoft as well, until May, 2014 when he stepped down from the chairmanship.

Here is where this billionaire stashes some of his money.

Investments in Corporations

While Gates can credit Microsoft for the bulk of his current wealth, his shares in the companyin MSFT make up just around 20% of his holdings today. The majority of Gates’ financial assets are investments in corporations managed by Cascade Investments, LLC, an entity now partially run by Gates to purchase stakes in various businesses. Although Cascade is highly secretive, some information can be gleaned from its financial disclosure statements. (For more, see: Management Advice From Megalomaniacs, Villains and Innovators.)

The portfolio held for Gates by Cascade is certainly well-diversified, with investments ranging from over $2 billion of Republic Services (RSG), a waste management company, to over $680 million in the national car dealership franchise AutoNation (AN). Nearly another $2 billion is stashed away in Ecolab (ECL), which produces cleaning supplies. In addition, it is reported that Cascade owns nearly a 50% stake in Four Seasons Hotels, over 10% of Canadian National Railway (CNI), around 7% of Arcos Dorados (ARCO), the largest McDonald’s franchisee in the world, and a large chunk of the tractor maker John Deere (DE) – among others.

Gates recently founded BGc3 (Bill Gates Catalyst 3), a think tank and venture capital firm dedicated to scientific and technological services, industrial research and computer technology to combat poverty. He is also directly involved in Corbis, a digital image licensing and rights company, TerraPower, a nuclear reactor company, and Research Gate, a social networking sight for researchers and scientists.

Real Estate

His investment portfolio is certainly significant, but Bill Gates also puts his money to use buying real assets, including a sprawling estate and a private island.

Gates’ Seattle-area home, Xanadu 2.0, is an ocean-side lodge boasting over 66,000 square feet with approximately 500 feet of private waterfront on Lake Washington. The estate features top-of-the-line technology and gadgets befitting its six kitchens, 24bathrooms and six fireplaces. Nearly every amenity