These days, the "Magnificent Seven" aren't exactly living up to their name and delivering magnificent performances. In fact, this group of tech giants that led market gains over the past two years is now leading declines.

All U.S. imports face a baseline 10% tariff, effective Saturday. + Higher rates will apply to partners judged "bad actors" on trade. For example, Japan faces a 24% duty and the European Union faces a 20% levy,