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The objective of this paper is to measure the territorial challenges of mergers and acquisitions within large retailer networks. First, the paper details the evolution from competition to coopetition that mergers in the retail field have undergone, as well as the shifting regulation context. Using data from 3,379 supermarkets and hypermarkets, we measure the spatial dispersion of ten chains, using relative entropy to quantify the territorial coverage of alliances within the distribution networks. We study in detail the case of the failed merger between the Auchan Group and the U Group. We then compute the territorial stakes of mergers and acquisitions activity for large food retailers’ networks. Results show that store transfers remain in rare cases an effective lever for improving territorial coverage.