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- ADT Security Services, Inc.
- ADT Security Systems, Inc.
- Adtran Inc.
- Advance Auto Parts, Inc.
- Advanced Circuits Inc.
- Advanced Fibre Communications, Inc
- Advanced Marketing Services, Inc.
- Advanced Medical Optics, Inc.
- Advanced Neuromodulation Systems, Inc.
- Advanced Technology Laboratories, Inc.
- Advanstar Communications, Inc.
- Advantica Restaurant Group, Inc.
- Adventist Health
- Advertising & Other Business Services
- Advocat Inc.
- AECOM Technology Corporation
- Aeg A.G.
- Aegean Marine Petroleum Network Inc.
- Aegek S.A.
