Sublette USD 374 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) American Fidelity Assurance Co.(800) 654-8489 Aspire-IPX_National Life Group(844) 362-6844 457(b) American Fidelity Assurance Co.(800) 654-8489 Aspire-IPX_National Life Group(844) 362-6844