The £30bn local government pension pool has appointed Quoniam and Robeco to manage an active equity portfolio worth around £400m.
Brunel Pension Partnership's low volatility global equities portfolio is expected to increase to at least £600m, but the date when this will happen depends on when it receives formal instructions from its clients.
The pool's chief investment officer Mark Mansley said: "For this search, two particular areas we were interested in were understanding how managers address risk of valuation bubbles in low volatility strategies, and their use of environmental social and governance considerations to help further reduce risk.
"We were impressed by the clarity of these managers' investment processes, and, as always, sought out those whose values chimed with our own with regards to successful long-term investment, while bringing their own unique perspectives on successful investment."
Brunel Pension Partnership was supported through the search by Redington Investment Consultancy. The portfolio is expected to be split equally between the two asset managers.
Quoniam head of international client relations Barbara Wokurka said: "We are proud to be one of the first active managers appointed by Brunel and look forward to a partnership that offers diverse investment solutions to its underlying clients."
Robeco UK head Peter Walsh said winning the mandate also strengthens Robeco's sustainability investing profile in the UK as the portfolio has a specific focus on carbon reduction. He added: "We look forward to a very long and productive partnership."
Last June, Brunel appointed FundRock Management Company to provide Authorised Contractual Scheme operator services, after it won regulatory authorisation from the Financial Conduct Authority in March 2018 to operate as a full scope investment firm.
Last year, Robeco was selected by the Border to Coast Pensions Partnership to provide voting and engagement services.
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