Ray Dalio is one of the most successful investors of all time. According to the CFA Institute, his hedge fund, Bridgewater Associates, "generated consistent outperformance over nearly three decades, a feat even more impressive when adjusted for risk and fees."

And one of the biggest bets for Dalio's hedge fund is buying a superstar stock that minted numerous millionaires in recent years.

Dalio's hedge fund regularly makes changes to its portfolio. Over the last reported quarter, it either bought more of or sold off all 20 of its top 20 positions. Some positions changed only slightly. Others were either hugely magnified or reduced considerably.

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Source Fool.com