Hedge fund manager Philippe Laffont reduced his exposure to Nvidia and started a position in CoreWeave, one of Wall Street's hottest IPO stocks.Nvidia (NVDA 1.74%) is the cornerstone of the artificial intelligence (AI) boom, and Wall Street has a great deal of conviction in the semiconductor company. Among 65 analysts, the median target price is $175 per share. That implies 13$155.Yet hedge fund manager Philippe Laffont of Coatue Management sold 1.4 million shares of ...