Does Vanguard Administer 401K Plans? 
Vanguard does administer 401k plans . Vanguard can handle everything from helping a small start-up company get a plan up and running to working with a mega plan . For small to mid-size companies , Vanguard uses the record expertise of Ascensus , a leading record keeper and administrator of retirement plans . If you already have a Third Party Administrator , Vanguard can work with them as well . 