Mercer Super, one of Australia’s largest superannuation funds, has warned its one million members that their details may have been stolen during a break-in at a post office.
The $74 billion fund managed by Marsh & McLennan’s (NYSE: MMC) global consulting subsidiary Mercer said Australia Post experienced a security breach at the Melbourne general post office (GPO).
This could potentially affect a large number of box owners including Mercer Super and Virgin Money Super but it was not known how many members would be impacted.
“It’s possible that letters containing members’ personal or financial information were stolen,” Mercer said in a message on its website.
“At this point we believe that this incident has not impacted members’ accounts.”
Members were told that if they had sent Mercer Super mail from 1 to 17 July 2025 and had not seen a transaction appear on their account or received a response within the expected timeframe they should call:
1800 682 525 – Mercer Super Monday-Friday, 8am-7pm (AEST/AEDT)
1300 652 770 – Virgin Money Super, Monday-Friday, 8am-6pm (AEST/AEDT)
“We will help confirm whether we received your correspondence and advise on next steps,” the fund said.
Mercer said Australia Post had reported the incident to Victoria Police, which were investigating the incident.
Mercer had also reported the incident to the Australian Information Commissioner and the Australian Prudential Regulation Authority.
Australia Post has advised that they have implemented a range of additional security measures following the break-ins, including an after-hours security presence at this site.
More information can be found here.
