The outage in Xetra, a fully-electronic cash market trading system, is affecting trading in Austria, Czech Republic, Hungary, Germany and Slovenia.
The Austrian blue-chip index (ATX) did not open at the scheduled opening time of 0700 GMT.
Trading volumes on German blue-chip index DAX (GDAXI) was stuck at 0.15% of the long-term daily average, while the broader STOXX 600 (STOXX) saw 3% of daily average go through at 0733 GMT, according to Refinitiv data.
“I just can confirm that there is a technical issue on Xetra … we’re currently investigating the failure,” Patrick Kalbhenn, a spokesman for the German stock exchange, said.
The technical snag is a further blow to Deutsche Boerse, which saw one of its longest outages in April when the Frankfurt stock exchange was halted for more than four hours.
The German stock exchange’s cash markets generated a turnover of 159.8 billion euros ($179.5 billion) in May.
($1 = 0.8905 euros)