Shares of Wall Street heavyweights Apple AAPL.O, Amazon Inc AMZN.O and Alphabet Inc GOOGL.O declined between 3.5% and 6% in premarket trading. Apple forecast another revenue decline at the start of the year, Amazon warned that its operating profit could fall to zero in the current quarter, and Google parent Alphabet missed Wall Street estimates for fourth-quarter results. The results looked set to snap the rally in U.S. equities in the previous session after Fed Chair Jerome Powell in his remarks after the Wednesday policy meeting referred repeatedly to the "disinflationary" process being underway.