The London Stock Exchange (LSE) has suspended continuous trading and is investigating an issue on its new Millennium Exchange platform that has affected its opening auction this morning.
A notice on the LSE's website at 08.32 stated that order entry on its SETS and SETSqx order books have been disabled due to a “market data issue” and that the system was being put in a ”halt' phase. Participants are able to delete existing orders.
The issue began at the start of trading, when the exchange said it experienced “potential system issues” during its opening auction call period. Trades that took place in the opening auction will stand.
The LSE is continuing to investigate the outage and will provide further updates during the trading day.
Following the migration of the LSE to Millennium Exchange on 14 February, some bid/ask data delivered via terminals that use the FIX Protocol was displayed intermittently as zeros. The issue affected data vendors including Thomson Reuters, SIX Telekurs and Interactive Data.
Turquoise, the LSE's multilateral trading facility, migrated to Millennium Exchange on 4 October 2010. On 5 October, Turquoise, opened an hour and fifteen minutes late because of internal network issues. The LSE then decided to delay the planned migration of its main UK market from October to February.