"Nasdaq's Stock Chaos: Glitch Causes Order Cancellations and Reversals"
Nasdaq resolved a system error that affected over 50 clients by rolling back the concerned application to a previous version. The issue, caused by a duplicate internal order ID in the FIX/RASH order handling system, led to the shutdown of the system, blocking new orders and canceling open orders. Some customers experienced inaccuracies and delays in execution reports. Nasdaq is confident that the corrective action has fully addressed the issue and trading will resume normally. The exact number of trades affected during the system error is unknown.