Isle of Man based International Financial Group Limited has completed the deal to buy Sovereign Pension Services Limited.
Work will now be done to rebrand SPS as IFGL Pensions by the middle of the year.
The company will continue to be based in the Wirral, where it employs 45 staff, while IFGL has 450 employees across its Douglas and Castletown offices.
Chief Executive David Kneeshaw says they have ambitious plans for their future, and this will provide a wider range of services and value to customers and advisers.
Bank deposits rose over past year
Innovation and Investment forum expands to Island
Conister Bank boosts local charity with record donation
Paragon Recruitment merges with HR company
Number of settlement agreements with regulator triples
Trade stand applications open for Royal Show
Island to be represented at major Spanish egaming event
Sign-ups for Graduate Fair now open