Fimalac, a holding company, completed the acquisition of a majority stake in Jellyfish, digital marketer, for $500m. The French group will merge its data-driven marketing specialist Tradelab into London-based Jellyfish as part of the deal. “We want to create this new kind of agency that Martin Sorrell started. Now we are in very good shape to be a real competitor,” Veronique Morali, president of Webedia, Fimalac’s digital media subsidiary.