Retail business A is comprised of multiple locations with a total of approx. 75 participants, owners include 2 families and operates a 401k plan, Family 1 owns 51% of the business.
Retail business B is comprised of multiple locations with a total of approx. 40 participants, owners include children of Family 1 (with ownership of 51%) and operates a 401k plan.
Retail business C opened in 2008, and is comprised of one location with a total of approx. 5 participants, 25.5% ownership to Family 1, all other owners are unrelated with smaller shares.
Retail business D opened in 2015 and is comprised of one location with a total of approx. 10 participants, 51% ownership to Family 1.
Participation agreements were created in 2019 using business A as Signatory Employer. Prior to this, they operated their own plan documents.
Each plan was tested separately and a 5500-SF was filed for each division, using their separate business plan names and TINs 2019 to present.
What issues are present in this situation?