Shares of major “Magnificent Seven” technology companies were headed for steep weekly losses Friday morning as investors grew increasingly skeptical about the sustainability of the valuations and sky-high spending levels that have defined AI development thus far. Leading chipmaker Nvidia (NVDA) lost about 3% in the first hour of trading Friday morning, after a Trump … Continue reading Dow, S&P 500 and Nasdaq end volatile week lower amid worst tech selloff since April