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Closing Bell: Apple Reportedly Working on Car Software; Stocks Slide on Earnings Mix

Stocks were in the red through to the end of the day on Tuesday after sales warnings from Caterpillar and Under Armour spooked investors.

Stocks were in the red through to the end of the day on Tuesday after sales warnings from Caterpillar (CAT) - Get Report and Under Armour (UA) - Get Report spooked investors. Crude oil added to losses after closing down 1%, under $50 a barrel. Sprint (S) - Get Report slumped despite a better-than-expected quarter in which its postpaid phone churn reached a record low. The telecom narrowed quarterly losses and raised its full-year operating income target. DuPont (DD) - Get Report also enjoyed a positive quarter, posting adjusted earnings more than double the same period a year earlier. The chemicals company also boosted its full-year profit estimates. Apple (AAPL) - Get Report  is reportedly testing out a car operating system which could operate self-driving vehicles. Apple reportedly has dozens of engineers working on the software in Canada.

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