“Study the science of art. Study the art of science. Develop your senses – especially learn how to see. Realize that everything connects to everything else.” – Leonardo da Vinci Market making in individual stocks has become so competitive that most hyperactive strategies – the ones that reside in Alphacution’s structural alpha zone – have turned to increasingly rely on some form of ETF arbitrage. This competitive dynamic is exacerbated by factors such as liquidity fragmentation, liquidity internalization, payments for order flow (PFOF), and the winner-take-all impacts of process automation (aka – scaling via technology). For those proprietary trading firms with few, if any, options positions in their portfolio, cash ETF position concentrations (based on total 13F position counts) are represented as follows: When we isolate the leading order flow wholesalers and consider aggregate cash ETF positions as a percentage of 13F gross value, one of the clues that rises to the surface (in concert with the findings in the prior chart) is the prominence G1 Execution Services (G1X), a unit of legendary derivatives powerhouse, Susquehanna [...]