Let's say Mongo Company wants to offer a safe harbor 401(k) plan to its employees. Mongo is actually made up of 3 different companies.
Mongo wants to offer Companies A and B a safe harbor w/4% match. But they want to offer Company C the 3% nonelective safe harbor design. Company C is significantly smaller in headcount than A&B.
Is it possible to offer different safe harbor designs within a control group?