UPDATE: Trading Disruption and Platform Migration

Investigations into this morning's trading disruption on London Stock Exchange's pan-European MTF, Turquoise, have revealed that human error was to blame for the disruption that began at 0823am this morning. The issue was swiftly isolated, and normal trading resumed at 1030am. Preliminary investigations indicate that this human error may have occurred in suspicious circumstances. The LSEG take this matter very seriously and a full internal investigation has now begun. The relevant authorities have been informed.

In light of this incident, coupled with necessary network upgrades to address ultra low latency and high flow inherent in the new platform, the Group has regrettably been forced to postpone its Main Market LSE technology migration for SETS. Given that December is an agreed change freeze period, the London Stock Exchange Group will work in partnership with customers to agree a date as early and practicably as possible in 2011 to reschedule the Main Market migration.

For further information, please contact:

Press Office +44 (0)20 7797 1222
newsroom@londonstockexchange.com