https://www.reuters.com/article/us-retail-trading-hot/gamestop-amc-tumble-as-retail-trading-mania-cools-idUSKBN2A315E >Shares of videogame retailer GameStop Corp and movie theater operator AMC Entertainment Holdings Inc lost 15% and 13.2%, respectively, in early U.S. pre-market trading on Wednesday as a social media-driven trading frenzy cooled.