the bringing together of two or more hitherto independent enterprises. A merger is vertical when successive phases of production are concerned, horizontal when similar units are involved
A merger shall require at least the approval of the general meeting of each of the merging companies. The laws of the Member States shall provide that this decision shall require a majority of not less than two thirds of the votes attaching either to the shares or to the subscribed capital represented.
... the mutual recognition of companies or firms within the meaning of the second paragraph of Article 48, the retention of legal personality in the event of transfer of their seat from one country to another, and the possibility of mergers between companies or firms governed by the laws of different countries ...