Quick search shows ARCA is not a market maker. Thi
Post# of 85521
"ARCA is NOT a market maker.It is an NYSE exchange partner that completes trades for a fee. Usually pre-arranged. NYSE Arca appoints Lead Market Makers (LMMs) for ETPs (Exchange Traded Products) with a primary listing on the exchange to meet defined obligations in exchange for incentives such as lower transaction fees."
I don't know enough about ARVA but it sure sounds interesting.