Stocks making the biggest moves midday: GameStop, Amazon, Carvana and more

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Check out the companies making headlines in midday trading.

GameStop — The meme stock tumbled nearly 18% after the company fired CEO Matthew Furlong and appointed Ryan Cohen as executive chairman, effective immediately. The company didn't provide a reason for the termination.

Amazon — The e-commerce stock added 2.8% on the back of a bullish analyst call. Wells Fargo initiated coverage of Amazon with an overweight rating, saying shares could rally more than 30% as it transitions to its regional fulfillment model.

Carvana — Shares popped more than 45% after the online car seller issued an upbeat outlook for the second quarter. Carvana said it now expects non-GAAP total gross profit per unit to come in above $6,000 in the second quarter.

Signet Jewelers — Shares shed 10% after Signet Jewelers lowered its fiscal full-year outlook. The company cited increasing macroeconomic pressures weighing on the consumer.

Fisker — Shares dropped 9% after Wolfe Research on Thursday downgraded Fisker to underperform from peer perform. Analyst Rod Lache said he questions Fisker's competitiveness, as the automaker attempts to build its business in «some of the most highly saturated Industry segments.»

Warner Bros. Discovery – The media stock gained more than 6%, building on a more than 6% gain in the previous session after the departure of CNN CEO Chris Licht.

Wynn Resorts, Las Vegas Sands – Shares of Wynn Resorts and Las Vegas Sands dipped 1.2% and 1.8%, respectively, following downgrades by Jefferies to hold from buy. The firm said a Macao recovery is already priced in.

T-Mobile – The telecom giant added 2.6% following an upgrade to outperform from peer perform by Wolfe Research. The firm said the stock's recent