The agency now has a total of 26 FTSE 100 clients, increasing its lead over second-placed Finsbury, which has 22 clients. Brunswick recently won Anglo American's retained account from FD.
FD led the way in terms of total clients, having gained four new clients since August to get up to 183. Buchanan Communciations remains in second place with 98 - losing three over the quarter - followed by Brunswick, Citigate Dewe Rogerson and College Hill.
FD also maintained its lead in the AIM and FTSE 250 league tables.
Brunswick led a table of total clients by profit, topping Maitland, FD, Smithfield and Finsbury respectively.