Warren Buffett is considered one of the best investors in history. Since 1965, he has steered the Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) investment company to a mind-boggling 4,384,748% increase in value. The benchmark S 500 index is up just 31,223% over the same period.

Buffett's investing strategy is simple. He likes companies with steady growth, strong profitability, and high-performing management teams. He's especially fond of those that return money to shareholders through dividends and stock buybacks. That strict criteria is why so few technology stocks have made their way into Berkshire's portfolio.

A group of companies dubbed the "Magnificent Seven" have captivated investors over the past year with their strong performance and whopping $13.5 trillion in combined valuation. The seven stocks include:

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Source Fool.com