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Mega-cap is the Motley Fool phrase given to stocks that have market capitalizations in excess of $100 billion. (For a full listing of the categories of market capitalization by size, click that link.)

Mega-caps through their sheer size often have less volatile stocks that many people regard as "safer" than the average stock.

Mega-caps can face future headwinds in the quest for continued appreciation in the form of the Mega-cap Multiplier Obstacle.