The small size of the agri-food cooperative sector in the European Union, and in particular in Spain, is identified as one of its main weaknesses, which has motivated from different fields, the search of formulas and methods that contribute by increasing its dimension, with the objective to grow their competitiveness and ability to operate successfully in increasingly global markets. In this scenario, have emerged in recent years the phenomena of concentration and cooperation between companies of different nature, which have been consolidated in almost all sectors as the way to achieve market leadership through mergers, creating cooperative groups or integration into second tier cooperatives, being the mergers one of the ways of integration more relevant in recent times. Cuadro 6. Diferencias en la situación pre-fusión entre cooperativas absorbentes, absorbidas y las implicadas en una fusión por creación.