IB clients traded $100 billion worth of stocks in December 2019, which tripled to $295 billion in March 2020. That's almost double of Ray Dalio's Bridgewater AUM. IB's client's AUM is $180 billion, which is also more than Bridgewater's AUM. Considering that retail trading may be 10x as much across all brokerages, those big hedge funds (that do not really trade) may have less influence than retail and semi-pro trades. https://finance.yahoo.com/news/interactive-brokers-group-reports-brokerage-163400427.html