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Regulation National Market System (Reg NMS)
Regulation National Market System of the Securities and Exchange Commission consists of a group of SEC rules designed to modernize and strengthen the regulatory structure of the U.S. equity markets. Among other things, Reg. NMS promotes price protection by requiring that all trades, with limited exception, be executed at the best-displayed price. The NYSE Hybrid Market is fully consistent with Reg. NMS.
 NYSE Regulation NMS Order Types - A one page reference summarizing key differences between types of Immediate and Cancel and Do Not Ship, or Intermarket Sweep Orders.
Activation of DNS Order Type For Selected Stocks - A list of current stocks that are activated for DNS (Do Not Ship) Orders. |  Excel version. (xls)
NYSE Group's Reg NMS Solution - At NYSE Group, we are taking customer choice to new heights. As the operator of two exchanges – NYSE and NYSE Arca – we have two differentiated market models to meet your trading needs.
NYSE Reg NMS Specifications
MFN for CMS 42.60 (10/13/06) | MFN for CMS 42.00 (4/12/06)
With the Release of the most recent Member Firm Notification (MFN) which updates specifications to the Common Message Switch (CMS), the NYSE has completed all specifications required for CMS NYSE Regulation NMS support. In release 42.60 the definition of the new values that will be required for the Phase IV December role out of Reg NMS IOC Orders are provided.
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