NSE did not identify the cause of the problem, which stopped trading for four hours, but said the root cause had been rectified.
Such disruptions have been less frequent since Nigeria switched to the high-speed Nasdaq X-Stream platform in 2013, brokers said. The first trading halt after the Nasdaq platform was introduced was in 2014.
"NSE has a robust business continuity framework in place with processes designed to forestall and reduce the impact of such unpredictable technical glitches when they occur," the stock exchange said in a statement??. Nigerian stocks have lost five percent so far this year, extending a 17.8 percent loss in 2018. Analysts expect appetite for equities to be weak ahead of elections next month.
The index gained 0.51 percent to 29,982.48 points as trading opened on Monday and the NSE said it will extend trading by one hour to close at 1530 (1430 GMT).