Hermes Investment Management has substantially grown its stake in British utility Southern Water, buying a 17% shareholding previously owned by Australia’s sovereign wealth fund.

Hermes bought the 17.1% stake in Southern, which supplies water to more than 2.4m people in Hampshire and other English regions, months after reports the AUD117bn (€79bn) Future Fund planned to dispose of its 23.4% shareholding, built up since 2008.

In a statement, Hermes said it completed the transaction following the sovereign investor’s sale, and that the manager now owned 21% of the utility.

Financial terms have not been disclosed.

The last full sale of the company, in 2007, saw Royal Bank of Scotland sell Southern for £4.2bn to a group led by JP Morgan.

Its current owners include a number of pension funds, as well as infrastructure funds. 

Peter Hofbauer, head of infrastructure at Hermes Investment Management said: “We are pleased to have acquired this additional ownership interest in Southern Water, obtaining incremental governance rights, including board representation, on behalf of our clients.�

Hermes, owned by the UK’s BT Pension Scheme, would not be drawn on the client for which it acquired the stake, but a spokeswoman clarified that the transaction was not conducted on behalf of the Hermes GPE Infrastructure Fund (HIF).

HIF is backed by six UK local government pension schemes (LGPS) – including those for Dorset, Cornwall and the London borough of Barking and Dagenham – and, as a result, Hermes has been considering the launch of a . 

HIF has previously bought into Associated British Ports, in which .

Hermes was also part of a group to buy the UK government’s stake in .

Both previous deals were also supported by the Santander UK Group Pension Scheme, for which Hermes runs a segregated infrastructure account.

However, a spokesman for Sandander confirmed that the scheme had not participated in the Southern deal.