The value of deals worked on by the top ten financial comms agencies increased by £7bn in March.
CDR was lifted by the closing stages of Mexican cement giant Cemex's £2.3bn takeover of RMC.
The Maitland Consultancy's work advising Cemex helped it to third position, back into the Deal Watch top ten after a month's absence.
Brunswick came second, moving up four positions from February partly because of its work for vehicle recovery group RAC, which was acquired by insurance giant Aviva for £1.1bn last month. Aviva used Financial Dynamics, which returned in fourth position after taking the top spot in January.
Tulchan Communications was another re-entry to the table, coming fifth.
The firm advised its retained client Whitbread on the sale of its Marriott hotels business to a joint venture between Whitbread and Marriott.
Seven agencies that made the top ten for February's Deal Watch dropped out of March's table, with only Brunswick, Finsbury (sixth) and Buchanan Communications (seventh) remaining.
'These figures show there are a large number of deals in the pipeline that will put an upward spin on the data in the coming months,' said Zephus head of research Ed Mountifield.
DEAL WATCH - MARCH 2005 RANKING
Ranking Financial PR Company No of Deal Value
Deals pounds m
1 Citigate Dewe Rogerson 17 4,219
2 Brunswick Group 19 3,969
3 The Maitland Consultancy 10 3,870
4 Financial Dynamics 29 3,448
5 Tulchan Communications 4 1,848
6 Finsbury 4 1,153
7 Buchanan Communications 25 975
8 The Hogarth Partnership 4 849
9 CardewChancery 1 668
10 M:Communications 3 559
Source: ZEPHYR published by Bureau van Dijk