A “communications issue” affecting trading and market data dissemination forced the New York Stock Exchange (NYSE) and the American Stock Exchange to delay their close yesterday.
The two exchanges, both owned by the NYSE Euronext group, closed at 16.15 instead of the usual time of 16.00 to allow the execution of orders affected by the glitch. The group said in a market notice that because of the timing of the problem, quotes were indicated as closing quotes even though the market was still open.
The previous day, NYSE implemented a new order delivery and processing system, dubbed NYSE Super Display Book, to replace the 33-year-old SuperDOT platform. According to the exchange, the new system cut order execution times to five milliseconds from 105.