“…Hendershott, Jones and Menkveld (2011), Brogaard, Hendershott and Riordan (2014), Brogaard, Hagstromer, Norden and Riordan (2015) and Boehmer, Li, and Saar (2018) find that HFTs are associated with improved market quality and price efficiency. However, a recent literature links the market impact of institutional orders to HFT "back-runners" who detect order flow "footprints" and trade ahead or alongside the institutional investor (see Yang and Zhu (2017) for theory and Kirilenko, Kyle, Samadi and Tuzun (2017), Van Kervel and Menkveld (2018), Saglam (2018), and Korajczyk and Murphy (2018) for empirical evidence). In this context, sub-optimal routing by a conflicted broker to an affiliated ATS could over expose the order and increase the price impact of institutional trades.…”