Stock market movements: Robinhood up, Concentrix down, GameStop down

Summary: In premarket trading, Robinhood's shares rose 6% with the launch of the Robinhood Gold Card. Concentrix's shares fell 4% due to disappointing earnings guidance. GameStop's shares dropped 17% after a revenue decline. Moderna's shares increased 3.5% with three vaccines in final trials. nCino's shares rose 12% with a revenue increase. Krispy Kreme's shares rose 2% with an expanded partnership. Viking Therapeutics' shares rose 3% on positive trial results. Deutsche Bank's shares climbed 3% after an upgrade. Trump Media & Technology Group's shares rose 14% post-IPO. Merck's shares gained 5% after FDA approval for Winrevair. Carnival's shares increased 2% ahead of earnings report.

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