Order Flow and Data. If you have access to Order Flow you can make pennies on each trade, this is how High Frequency Trading companies make money. If you have a

Order Flow and Data. If you have access to Order Flow you can make pennies on each trade, this is how High Frequency Trading companies make money. If you have access to Data, you can be one step ahead of the market and figure out the direction. Robinhood makes money by directing Order Flow through Citadel.