For almost 60 years, Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) CEO Warren Buffett has been wowing Wall Street with his investing prowess. Since becoming CEO in 1965, the affably dubbed "Oracle of Omaha" has overseen a nearly 4,950,000% aggregate return in his company's Class A shares (BRK.A). This explains why roughly 40,000 investors eagerly flock to Berkshire's annual shareholder meeting each year.

Many books have been written about Buffett's "recipe" for success. Though you can read in more detail about his core investment philosophy, the Oracle of Omaha tends to focus on time-tested, brand-name companies that have solid management teams and offer well-defined competitive advantages.

At the moment, Berkshire's $386 billion investment portfolio comprises 44 stocks and two exchange-traded funds. But make no mistake about it: These nearly four-dozen securities aren't created equally.

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Source Fool.com