Company A sponsors a grandfathered SARSEP using the mutual fund company's prototype. It wants to move the the assets to another mutual fund company, but the new company does not maintain a prototype (understandably). Any suggestions? Could Company A switch to the government form? Thanks

An employer can not move existing assets, they belong solely to the participants. With new documentation, however, future contributions could be placed with a new entity, provided, of course, that the participants establish SEP/SARSEP-IRAs with that entity.