The new entity will henceforth be called Quilter Cheviot Holdings Limited and the changes of ownership are also complete.
FSA had given its approval on 31 December 2012, while the changes in ownership had been completed on 18 January 2013.
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Meanwhile, the two businesses will retain their separate brands until later this year.
Martin Baines has become chief executive officer of both businesses and Quilter Cheviot Holdings Limited.
Currently, Quilter has 388 staff based in 13 locations across the UK, Jersey and Ireland, while Cheviot has 141 staff based in London and Liverpool.
