Ken Griffin is one of the most successful hedge fund managers in history, and he bought a small position in Palantir in the second quarter.

Billionaire Ken Griffin is one of Wall Street's most esteemed money managers. He runs Citadel Advisors, the best performing hedge fund in history in terms on cumulative net gains, according to LCH Investments. Citadel also outperformed the S&P 500 ( ^GSPC 0.53% ) by 20 percentage points over the last three years, making the hedge fund a great source of inspiration.

On that note, Griffin and his team made thousands of trades in the second quarter, but the decisions to sell 99% of their stake in Broadcom ( AVGO -1.24% ) and start a small position in Palantir ( PLTR 0.11% ) stand out.

Why? Broadcom is the second largest supplier

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