A system outage early on Wednesday forced bank-backed equity trading venue Turquoise to suspend trading until midday.
Trading was suspended at 8.26am after members experienced technical issues related to a complex dark order matching scenario.
The platform was made available for members to reconnect at 11.30am, with continuous trading resuming at 12.00pm.
However, dark order entry into the midpoint book and integrated book will be suspended until the root cause of the problem has been resolved.
All open orders have been cancelled by Turquoise market operations.
This is not the first time in its young life that Turquoise has seen trading disrupted. In September, just weeks into its phased launch, the MTF was hit by technical glitches.
Network and firewall-related problems affected technology in its data centre, leaving some brokers unable to trade for a short period before a back-up system kicked in.
Last month the CEO of the Tokyo Commodity Exchange, Masaaki Nangaku, voluntarily took a 10% hit on his pay for the month following a system outage which forced a day-long suspension of trading.