GameStop’s Plunge Triggers Halts as Platforms Curb Trades Bloomberg 1/28/2021 Bailey Lipschultz and Divya Balji (Bloomberg) -- GameStop Corp. plummeted on Thursday, wiping out a chunk of a rally posted over a dizzying six-day period, after moves by brokerages to curb trading of the stock on their apps whipped up volatility and enraged the company’s retail fanbase. The stock plunged as much as 68% Thursday after Robinhood Markets, Interactive Brokers Group Inc. and others took steps to curtail activity in several high-flying stocks, including GameStop and AMC Entertainment Holdings Inc. E*Trade Financial is preventing customers from purchasing shares of both firms, according to a person familiar with the matter.