The company has kept in front despite a decline in the total value of deals worked on and a big increase for Finsbury, its nearest chart rival.
Brunswick continues to advise Canary Wharf, which is the subject of a takeover battle that last month saw bid vehicle Silvestor UK Properties increase its offer for the company from 270p a share to 292p, valuing Canary Wharf at £5.5bn.
Brunswick also counselled supermarket chain Safeway on the closing stages of its £4.1bn agreed takeover by Wm Morrison, following the purchaser’s increased offer.
Finsbury, Smithfield and Tulchan Communications moved up the table on the back of their involvement in the Canary Wharf deal. Finsbury advises FTSE 100 property company British Land, which last month made public its involvement in the Silvestor consortium.
Smithfield is advising US investor Simon Glick, who is making the joint bid for Canary Wharf with Silvestor, which is advised by Tulchan.
New entries to the March table include Financial Dynamics, which advised medical publisher Taylor & Francis on a £565m bid by telecoms-to-pharmaceutical media conglomerate Informa Publishing Group for 51 per cent of the company.
Hudson Sandler and Bankside Consultants dropped out of the top ten.