German to English Bus/Financial Finance (general) corporate structure

All,

The sentence in question reads as follows:

"Der Vertrag hat Gültigkeit für die Gesellschaften innerhalb der XYZ-Gruppe sowie für alle künftigen XYZ-Gesellschaften/Beteiligungen."

I've looked for a brief equivalent English term meaning "companies in which XYZ has a [major] financial interest" but I've come up short (or rather "long"). Can anyone suggest something less verbose?

Is the degree of participation implicit in the German term, or is it open-ended, i.e. in order for Company B to be a "Beteiligung" of Company A, does Company A have to have a financial interest in Company B which is equal to or greater than a certain minimum share (such as 25%)?

All help gratefully received!

Thanks,

Ed