Yes[0] they do that and it is a bit pricey if you are quite small. We investigated them when setting up our 401k and found the fees to be a bit difficult to swallow for a 3 person company.
Our small company has a SIMPLE IRA through Vanguard. It costs $25/year (waived if you have $50k managed with them across any type of accounts) plus the mutual fund costs, which are very low. Almost no paperwork to get it started.
Definitely worth looking into for small businesses.