Ford shares tumble 5%

Ford fell nearly 5% Monday on reports of a downgrade from a Deutsche Bank analyst.

It was one of the worst performing stocks in the S&P 500.

The analyst, Rod Lache, noted that people may not want to pay more for a new Ford (F) F-150, now that gas prices have fallen, according to Bloomberg.

It starts at $25,420, about $400 more than the 2014 model.

Despite being one of the top-selling vehicles in America, the automaker revamped the F-150 this year. The big selling point is fuel efficiency because the body is made out of aluminum. The changes make the truck about 700 pounds lighter than the older model.

Related - Ford F-150 rated best "car" to drive

The 2015 F-150 started coming off the assembly line in November, around the same time gas prices started to fall.

But in November, CEO Mark Fields told CNN that he was not worried that the falling gas prices would impact demand for the new truck.

Deutsche Bank did not make Lache's report available to CNNMoney. Ford did not immediately respond to an email seeking comment for this report.

CNNMoney Sponsors