Duquesne Family Office's billionaire boss bid adieu to Wall Street's hottest AI stocks in favor of another trillion-dollar company and a long-awaited turnaround story in the healthcare sector.

For a lot of investors, earnings season is the highlight of every quarter. It's the roughly six-week period where most S&P 500 components report their operating results and give investors an inside look at how "healthy" corporate America really is.

But earnings season is far from the only important event each quarter for investors. The filing of Form 13Fs with the Securities and Exchange Commission can be equally valuable.

A 13F provides a concise snapshot of which stocks, exchange-traded funds (ETFs), and options Wall Street's savviest money managers purchased and sold in the latest quarter.

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