Grant Park CUSD 6 Authorized Investment Providers For specific investment provider information, please click on the investment provider name of your choice to visit the company's website. 403(b) Ameriprise Financial(800) 862-7919 Security Benefit Group(800) 888-2461 Vanguard Investments - Plan Number: 437318(800) 569-4903 Roth 403(b) Security Benefit Group(800) 888-2461 Vanguard Investments - Plan Number: 437318(800) 569-4903