The firms' principals, Sally Moloney and David Maguire, used Tenet’s practice buyout scheme to enable them to retire, says Tenet.
The two businesses are long standing members of Tenet’s investment network.
Tenet says the deals create a total of seven regional hubs, in a structure that also encompasses Preston, Northampton, Leeds, Edinburgh, Cardiff and Nottinghamshire.
Tenet’s group operations director, Helen Ball, said: “These two acquisitions offered a great opportunity to expand our network of advice into the South East. We’ll continue to establish further regional hubs in the year ahead.”