Duquesne Family Office's billionaire investor dumped one of the hottest AI stocks on the planet in favor of another critical company in the AI arena.For many investors, earnings season is the highlight of each quarter. This is the six-week period where the lion's share of S&P 500 companies reports their operating results from the previous three-month period.However, a strong argument can be made that Form 13F filings can be just as informative. A 13F is a required filing by institutional investors with at l ...