There are many others, its just harder to locate them...
Class A - Inactive Clearing Members
Blue Capital Group LLC
Brevan Howard Master Fund Ltd.
Citadel Derivatives Group LLC
CTC Holdings, L.L.C.
DRW Holdings, LLC
E*TRADE Futures LLC
Gator Trading Partners LLC
Getco Holding Company, LLC
Graham Fed Policy Ltd.
Harrison Trading Group, LLC
KC-CO II, LLC
Kingstree Trading, LLC
Mako Fixed Income Partnership LLP
Marquette Partners, L.P.
Medallion Trading
c/o Renaissance Technologies Corp.
Millennium Partners, L.P.
Mizuho Financial Group, Inc.
Moore Macro Fund, L.P.
Quiet Light Securities, LLC
S.A.C. International Equities, LLC
Sumitomo Mitsui Banking Corporation
Susquehanna Clearing, LLC
W.H. Trading, L.L.C.
Wolverine Trading, LLC