CNN Business  — 

Amazon’s stock plummeted after the company reported on Thursday slowing growth and higher costs in its latest quarter and offered a disappointing revenue outlook.

The tech giant said revenue grew 7% from the same period last year to $116.4 billion, slightly beating analyst forecasts but slower than the 9% growth in the final months of last year. The company forecast that revenue growth would slow further next quarter, anticipating a growth rate of between 3% and 7%.

Amazon reported a net loss of $3.8 billion for the quarter ended March 31, a sharp drop from the same period last year, when it made an $8.1 billion profit. It was also a big miss from the $4.4 billion profit that analysts surveyed by Refinitiv had forecast.

The company attributed the loss largely to a $7.6 billion loss from its investment in electric automaker Rivian Automotive. Rivian, into which Amazon led a $700 million investment in 2019, has seen its stock plummet more than 75% since its blockbuster November 2021 IPO.

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The Amazon loss came the day after Ford (F), another early investor in Rivian, took a $5.4 billion pre-tax charge related to that investment, resulting in Ford (F) reporting a $3.1 billion net loss for the first quarter.

Excluding the Rivian loss, Amazon would have made a profit of $3.8 billion, which still would have fallen short of analyst expectations, per Refinitiv.

Amazon (AMZN) shares sank more than 12% on Friday.

“The pandemic and subsequent war in Ukraine have brought unusual growth and challenges,” Amazon CEO Andy Jassy said in a statement.

Jassy referenced Amazon’s breakneck growth in its consumer business during the pandemic, and the “doubling” of the company’s fulfillment network in the last two years.

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“Today, as we’re no longer chasing physical or staffing capacity, our teams are squarely focused on improving productivity and cost efficiencies throughout our fulfillment network,” he added. “This may take some time, particularly as we work through ongoing inflationary and supply chain pressures, but we see encouraging progress on a number of customer experience dimensions.”

The company also announced that Prime Day, its annual sales bonanza, will take place this July in more than 20 countries.

In an earnings call, Amazon’s chief financial officer, Brian Olsavsky, said higher inflation, fuel prices and labor constraints added $2 billion to costs compared to last year.

“The cost to ship an overseas container has more than doubled compared to pre-pandemic rates,” he said. “The cost of fuel is approximately one and a half times higher than it was even a year ago.”

The rise of the Omicron variant towards the end of 2021 led to “a substantial increase” in employees going on leave, prompting Amazon to increase hiring to make up for the absences, Olsavsky said. But as workers returned when the variants subsided, “we quickly transitioned from being understaffed to being overstaffed,” he added. That resulted in “lower productivity” adding another $2 billion in costs, he said.

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Amazon’s earnings hit comes as the company continues to face pressure from its warehouse employees over issues such as pay and working conditions. Workers at a Staten Island, New York, warehouse voted to form the e-commerce giant’s first-ever US labor union earlier this month. Amazon has since filed an appeal, calling for a do-over of the entire vote.

A separate Amazon union election in Bessemer, Alabama, also concluded recently with the results too close to call.

Both union efforts grew from worker frustrations with Amazon’s treatment of workers amid the pandemic and were also motivated in part by increased national attention to racial justice issues and labor rights.

Amazon subsequently announced it would conduct a racial equity audit led by former US Attorney General Loretta Lynch.