As a result of NASDAQ becoming an exchange (according to US securities law) as of August 1, 2006, firms will need to differentiate between transactions occurring on the NASDAQ Exchange and transactions occurring off-exchange/over-the-counter (OTC). The question is: Which values should be used for Exchange fields in FIX messages?
HTML document which describes the FIX Protocol organization, a high-level technical overview of FIX, role of working groups and the Technical Committee, and how changes are made to the specification.