French supermarket group Rallye, whose French high street chains include Monoprix, discounters Leader Price and Franprix, has bought options on 2.8m ordinary shares in its subsidiary Casino, the group told just-food.
Rallye already controls just over 50% of the shares in the Casino Guichard-Perrachon business, with 63% of the votes.
The life of the share options has not been disclosed, a Rallye spokesman told just-food, although the basis for their acquisition is the possibility that Casino share prices will rise well beyond the level at which the deal was struck.
Casino operates about 10,000 stores worldwide and is active in the Americas and Asia, as well as Europe under a number of fascias.

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