Ken Griffin's Citadel reported a record profit of $16 billion last year, bring its total earnings to $66 billion since its inception in 1990. That makes Griffin the most successful hedge fund manager in history, according to LCH Investments. It also makes him an excellent source of inspiration for individual investors.

On that note, Griffin sold nearly all of his Tesla (NASDAQ: TSLA) stock in the first quarter, but he bought a significant stake in the Invesco QQQ Trust (NASDAQ: QQQ), a growth-focused index fund that tracks the Nasdaq-100. In fact, aside from certain options contracts, the Invesco QQQ Trust is Citadel's fifth-largest holding.

Here's what investors should know.

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Source Fool.com