The $47 billion industry fund has taken a direct stake in a UK ports company in which First State Super also holds a share.
The investment in Forth Ports is Cbus' first direct offshore investment in infrastructure.
It takes Cbus' infrastructure portfolio to $4.5 billion or nearly 10% of its total assets.
Cbus chief executive David Atkin said the infrastructure portfolio is integral to the fund's success in delivering resilient long-term returns to members.
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"Forth Ports has a proven track record of strong performance and high growth, with a strong management team that shares Cbus values of responsible, long term and sustainable practice, it is an expanding ports operator with long-term value underpinned by freehold title to all ports," Atkin said.
"Cbus has a proud history of infrastructure investment in Australia and with this partnership we now hold stakes in ports from Sydney to Edinburgh."
Cbus' workplace MySuper option has delivered 11.9% in year ending August 31, according to SelectingSuper.
Over a three-year period, the fund had the fourth-best performance of all workplace MySuper funds in Australia with returns of 10.2%.
Cbus head of infrastructure Diana Callebaut said the UK investment shows the fund's willingness to chase opportunities with like-minded investment partners and aligned managers.
"Cbus is always focused on how we deliver strong returns to members and our direct investment in infrastructure assets like Forth Ports aligns with the fund's long-term outlook, offering a strong pipeline of growth opportunities and aligning with our strategic approach to responsible investment," Callebaut said.
Forth Ports is an owner and operator of eight commercial ports serving as logistical gateways across the UK, connecting the UK with Europe and the rest of the world.
Cbus' $4.5 billion infrastructure portfolio has assets are spread across Australia, the UK and OECD countries.
It also has a decade-long partnership with Dexus in Australia, under which it has developed and taken stakes in Sydney CBD buildings, including 1 Bligh Street.