Where a company offers members of a company savings plan the opportunity to acquire shares or investment certificates issued by it, either by purchase or by subscription, and where a savings plan common to several companies in the same group within the meaning of articles L. 3344-1 and L. 3344-2 has been set up to enable members of this plan to acquire the shares or investment certificates of this company, the provisions of articles L. 3332-11 and L. 3332-27 apply in each of the group companies participating in the joint company savings plan.