Subject to effectiveness of a rule filing with the SEC, NYSE and NYSE MKT will no longer accept new Stop Orders and Good Till Cancelled (“GTC”) Orders beginning February 26, 2016. Additionally all existing GTC and Stop Orders residing on the NYSE book will be cancelled. Firms wishing to receive electronic outs on that date, will need to remain connected to NYSE gateways until 6:00 PM. Information on the Fix Tag combinations for Stop and GTC Orders can be found in this document. Думаю рынок сильно не изменится, все равно у брокеров будут свои типы ордеров синтетические.