The trading app, best known for its popularity with mom-and-pop investors, saw a surge in trading volumes as meme-stock influencer Keith Gill returned to social media and reignited interest in the highly shorted shares of videogame retailer GameStop. Its equity trading volumes surged 82% in April and 76% in May, compared with a year earlier. In the aftermath, Robinhood's transaction-based revenues jumped 69% in the quarter to $327 million.