Trading on the International Securities Exchange (ISE) was suspended Friday morning following a network power outage at its primary Jersey City site.
Trading on ISE's options and stock exchanges was initially halted at 10.16 am EDT.
Power has since been restored and stock trading resumed at 11.30 am with options following at midday. It is not known if trading data or records were affected by the outage.
ISE shareholders recently approved a $2.8 billion merger with Deutsche Börse's majority-owned Eurex subsidiary.