Amazon (NASDAQ: AMZN) has its worst day in over a year after missing expectations. Alphabet (NASDAQ: GOOG) (NASDAQ: GOOGL) hits a new high and announces a $50 billion buyback plan. Apple (NASDAQ: AAPL) and Microsoft (NASDAQ: MSFT) dip despite reporting huge profits. And McDonald‘s (NYSE: MCD) serves up a chicken sandwich-fueled surprise.