Williams Valley School District 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) Equitable(800) 628-6673 Kades-Margolis Corp.(800) 433-1828 Midland National Life(877) 586-0240 Security Benefit Group(800) 888-2461 Thrivent Financial(800) 847-4836 457(b) Kades-Margolis Corp.(800) 433-1828 Roth 403(b) Equitable(800) 628-6673 Kades-Margolis Corp.(800) 433-1828 Security Benefit Group(800) 888-2461