While I trade the ES on a regular basis, I really never concerned myself with how the market is made for this future on GLOBEX. Looking at the Book, it appears there are four levels of bids and asks--and they move incredibly fast. Are the MM's bots? If so, are there brokers behind the bots? Just curious as to how a market is made for the ES on GLOBEX. I know the NYSE has specalists and the NASDAQ is all electronics but with brokers acting as MM.