What Bill Gates Is Holding

What does the richest man in the world invest in? For starters, the railroad business and waste management.
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With an estimated net worth of $40 billion (down $18 billion over the past 12 months), Microsoft (MSFT) - Get Report chairman Bill Gates is now the world's richest man, according to Forbes' latest ranking of the world's billionaires. (Last year's top billionaire, Warren Buffett fell to second place, with an estimated net worth of $37 billion.)

So where does Gates put his money to work in the stock market?

Here are a few of Gates' largest holdings via Cascade Investments, his private investment vehicle.

Canadian National Railway

Republic Services

Fomento Economico Mexicano

Berkshire Hathaway

For more, check out the

Cascade Investment portfolio

on Stockpickr.com.

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