Despite the sector traditionally taking an August holiday - last year saw the number of M&A deals halve in the same period (PRWeek, 9 Sep 2005) - the top four agencies all had a markedly better August than July.
CDR topped the charts due to its involvement in Ferrovial-led Airport Development and Investment's acquisition of Heathrow and Gatwick owner BAA, which was completed last month.
The agency worked for Ferrovial on the £10.2bn deal, with Madrid-based Grupo Albión representing the consortium as a whole, elevating it to third in this month's chart.
CDR was also helped into first through its work representing LogicaCMG in its £881m bid for Swedish IT services rival WM-Data.
Brunswick, which represented BAA in August's headline deal, rose to second (from seventh) after posting 24 deals last month. It also worked for House of Fraser, which was acquired by a subsidiary of Baugur for £453m.
Tulchan Communications, which did not appear in July's rankings, came fourth.
Its improvement was in part down to its work for Goldman Sachs-led consortium Admiral Acquisition, on its £2.8bn bid for Associated British Ports (ABP). On the ABP side was Finsbury, which sat just behind Financial Dynamics in sixth.
Smithfield and Gainsborough Communications - seventh and ninth respectively - worked on either side of Phones 4U founder John Caudwell's sale of Caudwell Holdings to Doughty Hanson and Co.
Maitland (in eighth position) and Weber Shandwick (tenth) complete the top ten for August.