School District Of Marion 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) Invesco OppenheimerFunds(800) 959-4246 Security Benefit Group(800) 888-2461 Thrivent Financial(800) 847-4836 Vanguard Investments - Plan Number: 428967(800) 569-4903 457(b) Security Benefit Group(800) 888-2461 Roth 403(b) Invesco OppenheimerFunds(800) 959-4246 Security Benefit Group(800) 888-2461 Vanguard Investments - Plan Number: 428967(800) 569-4903