Sierra Charter School 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 CalSTRS Pension2(888) 394-2060 Invesco OppenheimerFunds(800) 959-4246 National Life Group(800) 579-2878 Roth 403(b) Invesco OppenheimerFunds(800) 959-4246