Dow Jones Futures Tumble 600 Points, As Boeing, Microsoft Report Earnings; Apple, Tesla Drop, While First Solar Soars On Earnings

Dow Jones futures, along with S&P 500 futures and Nasdaq 100 futures, signaled heavy losses ahead of the stock market open Wednesday. Tech giants Apple and Tesla were set to open with sharp declines. Microsoft tumbled on weak revenue guidance, while Boeing reported earnings ahead of the stock market open. First Solar soared 12% on strong earnings results.