Uber Technologies Inc.’s net loss ballooned in the first quarter as the ride-hailing giant was stung by the effects of the coronavirus pandemic and signaled further cost reductions a day after announcing plans to cut about 14% of its staff.

Uber reported a net loss Thursday of $2.94 billion on sales of $3.54 billion in the three months ended March 31, compared with a net loss of $1.09 billion and sales of $3.1 billion in the year-ago period. The larger loss includes $2.1 billion in pretax impairment write-downs on some of…

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