The stock market rally in the first half of the year helped one of the world's most famous billionaires score a big win. Bill Gates, co-founder of , saw his fortune climb by $4 billion thanks to investments in three companies, according to Barron's.

These gains over a rather short period of time aren't about short-term investing, though. They happened thanks to a long-term investment strategy. Gates, through his Cascade Asset Management firm, has owned the winning shares for years.

Let's find out more about Gates' first-half fortunes -- and how you might follow his lead.

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Source Fool.com