I have had two S-Corps for 20 plus years.
I was an employee of Company A.
I started Solo 401K in Company A in 2005 as that is the first year Solo 401K became available.
It used to be at Fidelity but eventually, I moved it to Vanguard once they began offering Solo 401K.
On December 31 2018, my company A merged with company B.
So company A ceased to exist.
I have been filing 5500EZ each year and filed it in 2019, 2020, 2021, and 2022.
I was still the only employee, the provider was still Vanguard.
The Solo401K plan name did not change either.
I am reading about stiff penalties for not filing 5500 EZ in a timely manner.
I am wondering if I should have done anything different like filed a final 5500EZ and created a new plan?