GameStop rallies after 'Roaring Kitty' gives testimony

Shares of GameStop reversed losses to trade 4% higher on Thursday after Keith Gill, who helped drive a recent surge in the videogame retailer, gave testimony in a Congressional hearing.

Known on YouTube as "Roaring Kitty" and widely followed on a Reddit trading forum, Gill said he remains bullish on the stock following its rally and selloff in January and February.