https://www.reuters.com/article/us-retail-trading-quotes/gamestop-stock-retreats-as-reddit-rally-runs-into-trading-restrictions-idUSKBN29X2OX >GameStop shares sank on Thursday as trading platforms including Robinhood and Interactive Brokers restricted trading in the video game retailer along with AMC Entertainment and other stocks that soared this week in a social media-driven trading frenzy that shook stock markets.