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In the case of an aggressive buyer or seller, the market venue or routing system must rely on NMS-defined intermarket sweep orders (ISOs) routed to displayed and auto-ex orders at the same time as executing the block.
The TABB report, in summarizing the National Market Structure (NMS) Rule 611 and its impact, explains the need for private linkages, how participants are repositioning themselves, the importance of being an exchange under the Order Protection Rule and the effect of the rule on best execution, intermarket routing and the various exemptions to the rule, including an intermarket sweep order.