We examine the changes in order flow on NASDAQ from 1993 through 2010. We find that while volume and the number of trades are increasing for NASDAQ-listed securities, the percentage of volume that executes on NASDAQ declines from almost 100% in the 1990's to less than 40% in 2010. We examine the...

Most financial security trading venues prioritize competing liquidity providers with price-time priority; entities displaying the best-priced limit order earliest trade with the next opposite-sided liquidity-demanding order. The New York Stock Exchange (NYSE) rule putting traders “on parity”...

We present evidence that in May 2022 several retail brokers who do not charge wholesalers for their marketable orders routed most of their marketable orders to wholesalers for order handling and execution. Using proprietary marketable order flow data from one or more wholesaler(s) for May 2022,...