Company A sponsors a Simple IRA. Company B sponsors a safe harbor 401(k) Plan. Company A acquires 100% of Company B through a stock acquisition in July of 2017. Both companies want to maintain their plans as is: Company A employees participate in the Simple IRA and Company B employees participate in the 401k.
I'm aware of the transition rules for coverage testing but can the separate plans continue as is past the transition period as long as they meet coverage?