"EY has the largest cybersecurity division of the big four firms with more than 300 dedicated cybersecurity professionals, which demonstrates our commitment to meeting rising client demand for cyber operations," said EY Oceania cybersecurity leader Anthony Robinson.
"The acquisition of Aleron will build on our growing capability to deliver end-to-end cyber resilience for clients as they embrace new and disruptive technologies such as cloud, robotics and Internet of Things.
"Today's announcement closely follows the launch of our largest cybersecurity facility in the Asia-Pacific region in Melbourne, which forms part of our network of cybersecurity centres globally."
Aleron founders Mark Wroniak and Alex Morkos, will join EY as partners, bringing with them 36 staff and contractors across Australia.
The acquisition includes Aleron's eDNA cybersecurity analytics and risk reporting platform, which EY plans to take to the global market.
"It's critical that cybersecurity is at the core of business strategy rather than just being seen as an off-the-shelf technology solution. Having worked extensively with some of Australia's largest organisations, Aleron will bring a unique understanding of business acumen coupled with a technological capability to create that important link to the C-suite and board," said Robinson.
Wroniak said "We look forward to working with the team at EY to expand our services and we are excited to be a part of a global rollout of our locally developed eDNA tool.
"Our experience as an end-to-end solution provider, coupled with our unique technology offering will enable us to leverage data-driven solutions for clients to address their concerns around cyber risk and translate that into real actions to resolve them."
EY Oceania CEO and managing partner Tony Johnson said: "This acquisition demonstrates our continued growth in digital services where we are already undertaking work in large scale supply chain transformation, blockchain, and intelligent automation."
Terms of the deal were not disclosed.