Stocks making the biggest premarket moves: Uber, Pfizer, Chegg, Dell & more

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Check out the companies making the biggest moves in premarket trading:

Uber Technologies — Shares gained nearly 8% after reporting revenue of $8.82 billion for the first quarter, topping the $8.72 billion expected by analysts polled by Refinitiv. The ride sharing company also posted an adjusted 8 cents loss per share, less than the 9 cents expected by analysts.

Pfizer — Shares of the drug maker rose more than 1% in premarket trading after the company topped earnings and revenue expectations for the first quarter, according to Refinitiv, despite experiencing a 75% decline in sales of Covid vaccines from the same quarter a year ago.

Chegg — Chegg shares tumbled 42% in premarket trading after CEO Dan Rosensweig said he expects artificial intelligence is «having an impact on our new customer growth rate.» Chegg issued a weak second-quarter revenue outlook. Otherwise, the online education firm beat first-quarter expectations on the top and bottom lines. Following the results, Jefferies downgraded the stock to hold from buy.

Dupont de Nemours — The stock sank nearly 5% in the premarket after the company gave weak guidance for the second quarter, with both earnings per share and revenue forecasts coming in under Wall Street's expectations. Dupont cited a delay in the electronics market's recovery.

Arista Networks — Shares dropped 8.5% despite the company topping Wall Street's expectations for the recent quarter on the top and bottom lines and sharing upbeat guidance. The decline came as Arista Networks said it expects moderating spending and slowing growth from its «cloud titans.»

Stryker — Shares dropped 3.3% after the medical technologies company warned that full-year sales and earnings per share will be