Some brokerages listed...in no order, and not inclusive.
Pershing LLC, Ameritrade Inc., Penson Financial Services, Inc Canadian Execution, Wells Fargo Bank IRA, Scottrade, Inc., First Clearing, LLC, UBS AG ZURICH, A/C A/C SEC OPS/ABACUS NETTING, Charles Swab & Co. Inc., OTC Dollar Lot Trade, Cust Trds Ltd Val Equity Sec's, Etrade, The Vertical Group Inventory #1, Mission Securities Corp. Segregated Reserve Acct., Penson Financial Services Worthless Securities, he he, Vandham Securities Corp.,VWAP Trading, WH Selfinvest Sa, Worthless Securities Acct., Dominion of Melchizedek, Non-Marketable Securities Bought form Customers, Computer Clearing Services, Worthless Securities Acct.
There were many others but couldn't figure out their designation, and most listed were connected with IRA accounts.
Mike