Tulchan Communications likewise benefited from the battle for P&O. It came fourth after advising PSA International on its £3.5bn offer for the ports group.
Brunswick is also advising Compagnie Saint-Gobain, whose £3.8bn acquisition of British Plasterboard ended this month. Second placed Finsbury advised the latter.
The third major deal for Brunswick was the completion of Spirit's £2.6bn sale to Punch Taverns. Punch adviser College Hill moved to sixth position.
Meanwhile, Financial Dynamics (fifth) advised Reckitt Benckiser, which this month completed its £1.9bn acquisition of Boots Healthcare International, which retains Finsbury.
The biggest deal for Cardew Group (seventh) was its advice to BC Partners, which sold Italy's largest cheesemaker, Egidio Galbani, to dairy group Lactalis for £1.3bn.
Elsewhere, Hudson Sandler and Fishburn Hedges re-entered the table. Hudson Sandler client Lookers bid £492m for car dealership Reg Vardy, while FH client Investcorp is buying Autodistribution for £413m.
Citigate Dewe Rogerson dropped four places to ninth in the chart, although client Honeywell this month acquired First Technology for £397m.
Despite the high value of deals handled by some agencies, the total value worked on by the top ten declined by more than £2.1bn in January.