U.S. stock futures were mixed this morning, with the Dow futures gaining around 100 points on Friday.Shares of Broadcom Inc (NASDAQ:AVGO) fell sharply in pre-market trading even after the semiconductor giant delivered fourth-quarter earnings beat and reported record artificial intelligence (AI) revenue.Despite a 74% surge in AI sales, investors focused heavily on disappointing guidance regarding shrinking gross margins and a sharply higher tax rate for fiscal 2026.Broadcom shares dipped 5% to $386.28 in pre ...