Ken Griffin's Citadel is the most profitable hedge fund in history. As of December 2022, it had earned nearly $66 billion for clients since its inception in 1990, while Ray Dalio's Bridgewater ranked second with $58 billion in profits. That accomplishment qualifies Griffin as a brilliant investor, and it makes his recent stock purchases particularly noteworthy.

During the second quarter, Griffin tripled his stake in Amazon (NASDAQ: AMZN) and doubled his stake in (NASDAQ: MSFT), signaling high conviction in two companies that are leaning aggressively into growing demand for artificial intelligence (AI). Indeed, excluding options contracts, Amazon is now his seventh-largest holding, and Microsoft is his largest holding.

Here's what investors should know.

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Source Fool.com