3 plan sponsors part of a controlled group, each wants to sponsor a separate plan

We have 3 companies that are part of a CGroup and each wants to sponsor a separate 401k plan just for their eligible participants.  Lets assume that there are owners who would be eligible for all 3 plans.  Would each owner (or participant) have separate 415 limits in each plan?  Or does the CG mean that they share only one 415 limit across all 3 plans?

Thanks

One 415 limit.