QQQ and SPY erase an afternoon slide to finish about 0.4% higher

QQQ and SPY opened 0.14% and 0.24% higher, fell to afternoon lows of 0.90% and 0.42% below the prior close, then recovered to finish up 0.41% and 0.40%. The Federal Reserve's rate hold, Powell's discussion of its dual mandate, tariff policy, and semiconductor supply-chain shifts provided the main context for the sharp intraday reversal.