The move of the NatMags portfolio, which includes Cosmopolitan and Good Housekeeping, into Rocket follows the agency's capture in June of the media planning and buying business for the NatMags joint-venture ACP-NatMag.
NatMags' media planning and buying was previously handled by Initiative, which had held the account for seven years.
Simon Foster, the marketing director of NatMags, said: "Our move from Initiative to Rocket is primarily driven by a wish to optimise our media buying efficiency. Initiative has provided excellent support to our team over a number of campaigns and the move is not based on any dissatisfaction with the service provided by them."
Rocket, part of the PHD Group, will work on campaigns for titles including Cosmopolitan, Good Housekeeping, Prima and Company. Mark Girling, the managing director of Rocket, said: "We are now looking forward to getting down to work on a number of projects as soon as possible."
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