Hartley is part of the Wilton Group and manages more than £1bn of clients’ assets.
Denis McHugh, chief executive officer of Hartley Pensions, said: “Hartley Pensions have always been fully focused on our clients and the services we offer. Each client is assigned their own highly qualified pension administrator who will be able to offer assistance and answer any queries during the transfer.
"The transfer and the changes will not have any impact on the investments, administration, reference numbers, contact details or fees for former clients of Guinness Mahon Trust Corporation."
Hartley has snapped up a number of defunct Sipp providers over the past few years.
In September 2019, Berkeley Burke’s administrators announced that the Sipp arm of the business would be sold out of administration in a pre-pack deal with Hartley Pensions.
This came after the company bought the £130m client book of GPC Sipp in August, which entered into administration after it was embroiled in hundreds of customer claims.
Troubled provider Lifetime Sipp also transferred 40 per cent of its Sipp book to Hartley Pensions ahead of going into administration in March 2018.
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