ShareBuilder Inc, accessible at https://www.sharebuilder401k.com/, specializes in providing retirement plan solutions tailored for small businesses. The company offers 401(k) plans designed to be simple, affordable, and catered to the unique needs of growing businesses. ShareBuilder 401k emphasizes low-cost investment options, automatic enrollment, and paperless management, making it easier for employers to set up and maintain retirement plans for their employees. They aim to help small businesses provide retirement benefits competitive with larger corporations by streamlining the setup process and offering educational resources for both employers and plan participants.