(Bloomberg) -- Rivian Automotive Inc.’s chief operating officer stepped down, extending a tumultuous stretch for the electric-vehicle maker. The shares fell in late trading.

Rod Copes, who had held the title since March 2020, left last month, according to his LinkedIn profile. 

The company said in a statement that he “began a phased retirement from Rivian several months ago, affording the team continuity as we moved toward production ramp.” His duties have been distributed across the leadership team, the company said Monday.

The fast-growing truckmaker, which in November completed the year’s biggest initial public offering, has hit a rough stretch recently, saying in December that it would fall “a few hundred vehicles short” of its goal to build 1,200 units for the year. Last week, the shares fell after Amazon.com Inc., a major investor and customer, said it would buy electric delivery vans from Stellantis NV.

Rivian’s final production total for 2021 was more than 1,000, the company told the Wall Street Journal, which first reported the Copes departure.

The stock fell 4.6% to $77.66 a share at 4:53 p.m. in New York after-hours trading, below its IPO price of $78. Through Monday’s close, Rivian’s shares had already fallen 21% this year.

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