"The auctions that take place at the open and close of the New York Stock Exchange are unmatched for their liquidity and price discovery. Now we are providing investors with greater visibility into that auction process, helping customers make better-informed decisions and more effectively manage their execution strategies," said Mark Schaedel, vice president, NYSE Data Products. "We believe the end result will be increased participation in the open and close, which in turn further contributes to market quality."

Stream of Rich Information at Critical Times of the Trading Day

NYSE Order Imbalances will include the following information: time (in milliseconds); symbol; side of the imbalance (buy/sell); paired quantity; imbalance quantity; and reference price (last sale).

Opening imbalances will be disseminated every 5 minutes between 8:30-9 a.m. ; every minute between 9-9:20 a.m. ; and every 15 seconds between 9:20 and the open (or 9:35 , whichever comes first). Closing imbalances will be disseminated every 15 seconds between 3:40-3:50 p.m. and every 5 seconds between 3:50 p.m. and the close.

The new NYSE Order Imbalances product will be provided free of charge to NYSE OpenBook customers. It follows the June 20 introduction of NYSE OpenBook Ultra, which provides a low-latency, event-driven look at the NYSE limit-order book as well as rich content and functionality; and the June 24 launch of NYSE Realtime Stock Prices, which enables information providers to offer NYSE prices in real time and free of charge to unlimited public investors. -- www.nyse.com