Latitude Financial says hack worse than first thought

Its teams were "working urgently" to identify the total number of customers and applicants affected and the type of personal information that was stolen, Latitude said.

It had previously estimated that 330,000 customers and applicants had been affected by the cybercrime, with 96 per cent having a copy of their driver licence or their driver licence number stolen. Around four per cent had their passport data stolen and less than one per cent had Medicare numbers taken.

Latitude shares resumed trading on Wednesday for the first time since the hack. At 11.48am AEDT they were down 9.8 per cent to a nine-month low of $1.0875.