FH has been tasked with a brief that combines analyst and media relations under a broad financial PR remit with the aim of raising the profile of its trust company and unit trust businesses.
Rathbone was unavailable for comment as PRWeek went to press, but the change of agency comes amid a challenging market for private investors.
The account will be led by FH financial practice head Andrew Marshall, heading a team of four that includes associate director Mark Tierney and consultants Sarah Frost and Jo Trezise.
Marshall said: ‘Rathbone is a unique company with a great story to tell and a tremendous performance track record.’
Rathbone manages more than £6.8bn of discretionary funds for individuals, their trusts, charities and pension funds, and for the professional advisers of these clients.
This includes more than £500m under management in Rathbone’s unit trust division.
The company has a full listing on the London Stock Exchange.
The appointment of FH comes only a month after Rathbone chief executive Roy Morris announced his retirement after seven years.
He is to be replaced in October by the current finance director Andy Pomfret, who joined the independent investment management company in 1999 from Kleinwort Benson Private Bank, where he was finance director.
Pomfret’s role will be taken by the current group financial controller Sue Desborough.