Investing genius Warren Buffett is known for his unblinking long-term strategy. His wealth-building mastery is built on deep analysis of business quality and market value.

Show him a company that's producing consistent earnings growth -- thanks to a well-defended business moat -- and is so simple it could be managed by a ham sandwich, and he'll ask for a decade's worth of annual reports. Only after finishing that light bedside reading will he consider the stock's valuation. The stocks under management by Buffett's Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) have passed an unrivaled gauntlet of quality checks.

That doesn't make Buffett's investing style boring. Berkshire's largest holding is iPhone maker Apple (NASDAQ: AAPL), which currently occupies 49% of the Buffett conglomerate's total investment portfolio. Cupertino's peerless brand loyalty sets it apart from the competition, and Buffett has called it "a better business than any we own."

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Source Fool.com