The New York Stock Exchange LLC and NYSE MKT LLC have eliminated certain equities Account Type Indicators (ATIs). As of October 15, 2012, member organizations were no longer required to use the eliminated ATIs. The exchanges have provided information regarding functional ATIs and related definitions, as well as updated order capacity codes and a guide to certain OATS reporting issues (Attachments). After February 1, 2013, member organizations must stop using the eliminated ATIs and must use only the functional ATIs.
NYSE Information Memo 12-25 is available here. Attachments to Information Memo 12-25 are available here.