Now Pensions has appointed Redington to provide independent investment consultancy services, replacing KPMG after a full tender process.
A number of advisory firms bid for the role over a two-month period during the fourth quarter of 2016.
Redington will now help the master trust craft its overall investment proposition and support areas of scheme governance.
Now Pensions director of investment Rob Booth said: "Redington's expertise in the balanced risk style of management adopted by Now Pensions will provide very useful additional insight for the trustee board.
"The trustees will also be asking Redington for its input to a review of the glide-path strategy, taking into account the make-up of the Now Pensions membership, and the retirement decisions being taken by members."
Board of trustees chairman Nigel Waterson added that given the pensions market is evolving rapidly, Now Pensions has to keep up with developments.
Redington head of defined contribution and financial wellbeing Lydia Fearn said: "When people invest in a pension they are looking for simplicity, value for money and long-term sustainability. Now Pensions is at the forefront of supporting members, not only in joining a pension scheme, but ensuring they achieve the best possible outcome when they choose to retire."
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