Nasdaq trading halted after technical problems TRADING resumed in Nasdaq Stock Market-listed securities, more than three hours after an abrupt halt in trading blamed on an unexplained technical issue paralysed a large chunk of the US stockmarket. The exchange said trades in all Nasdaq-listed securities between 12.14pm ET, as the outage began, and 12.23pm ET would stand. Trades made after that during the outage would be cancelled, the exchange said.