- American United Life Ins.
- Americas Styrenics (Non-Profit Match)
- Ameriprise Financial, Inc (for Employees and Employee Advisors (P1))
- Amerisure Companies
- Ameritech
- Ameritech Michigan
- Ameritech Ohio
- Ames Planning Associates Inc.
- Amgen Foundation
- Amgen, Inc.
- AMI
- Amica Companies
- Amoco
- AMP
- AmSouth Bancorporation Foundation
- Amsted Industrial Foundation
- Amsted Industries
- AMSTED Industries Incorporated
- Amtecha
- Amvesters Financials Foundation