Some brokers can trade from their own inventory or match trades order-order, but those using DTCC have restrictions.
READ THIS PART OF THE EMAIL FROM SCOTTRADE TO ONE OF THEIR CUSTOMERS
(HRNF) is unable to be bought or sold at Scottrade due to a Global Lock from the Depository Trust & Clearing Corporation (DTC). This is an industry-wide lock ... not Scottrade-specific. For information on when or if this restriction will be removed, we suggest calling the Investor Relations Department for (HRNF).
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