On June 19th, NYSE Regulation advised that following the close of trading on June 28, 2013, the Russell Investment Group will reconstitute certain of its indices. This reconstitution may significantly affect the volume of trading on the New York Stock Exchange and NYSE MKT. The Information Memorandum reminds members and member organizations of certain Exchange Rules and policies regarding entry and cancellation of market-on-close/limit-on-close and Closing Offset orders; publication of on-the-close imbalances; and printing the closing transaction. The memorandum also provides guidance on possible system interruption scenarios and the operation of certain Exchange Rules and policies in the event that such a scenario occurs. NYSE Regulation Information Memo 13-13.