One-time GameStop bull Telsey downgrades to sell, says price surge is unsustainable

Pedestrians walk past a GameStop Corp. store in New York, U.S.
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Analysts at Telsey Advisory Group are bullish on the turnaround story at GameStop, but the recent surge in the stock has forced the firm to the sidelines.

Shares of the brick-and-mortar video-game retailer jumped again Monday, putting the stock up more than 300% in January amid a short squeeze and flurry of retail trader interest.