Arm Holdings PLC (NASDAQ:ARM) and Palantir Technologies Inc (NASDAQ:PLTR) shares are tumbling amid a broader market selloff. Today's losses came after President Donald Trump's said reciprocal tariffs would target all countries that impose tariffs on U.S. imports, with duties set to go into effect on Wednesday. PLTR was last seen down 6.4% to trade at $80.40, also on track for its fifth consecutive daily loss after its latest surge fell short of the$100 level. The equity is testing long-term support from it ...