Wall Street ticks lower as more earnings come in ahead of Fed Chair Powell's speech

Wall Street is ticking lower in premarket trading Thursday as investors perused Walmart's latest financial results ahead of Federal Reserve Chair Jerome Powell's highly anticipated speech on Friday.

Futures for the S&P 500 turned 0.2% lower before the bell, while futures for the Dow Jones Industrial Average slid 0.3%. Nasdaq futures edged 0.1% lower.