Northland Preparatory Academy 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 Equitable(800) 628-6673 Teachers Pension Exchange (TPX)(888) 498-6870 Vanguard Investments - Plan Number: 436845(800) 569-4903 457(b) Teachers Pension Exchange (TPX)(888) 498-6870