After Thursday's sharp selloff, the steepest in more than three weeks, Wall Street found something to smile about. Optimistic forecasts from Apple and Amazon offered reassurance that America's corporate heavyweights can still deliver when it matters. Amazon's shares leapt in pre-market trading as its cloud division grew at the fastest rate in nearly three years. Apple also rose after predicting robust iPhone sales for the holiday quarter. Big Tech remains the engine of market confidence, even as it races to reinvent itself through artificial intelligence.