Noting MM ETRF is the one witth 6.6+ milly bid...
Post# of 85521
ETRF
G1 Execution Services LLC, was formerly the market making unit of E*Trade Financial Corporation. The firm was sold to Susquehanna International in 2013. The firm specializes in market making on all exchanges and facilitating trades for retail customers.
https://www.investorsunderground.com/level-2/market-makers/