- American Medical Alert Corporation
- American Medical Association
- American Meteorological Society
- American Museum of Natural History
- American Music Club (musician)
- American National Insurance Company
- American Needle
- American Paints (India)
- American Petroleum Institute
- American Princes
- American Public Education
- American Railcar Industries, Inc.
- American Real Estate Partners, L.P.
- American Recordings
- American Recyclers Association
- American Red Cross
- American Remedies
- American Repertory Theater
- American Retro
- American Rifleman Magazine
- American Safari Cruises
- American Science and Engineering, Inc.
- American Society for Reproductive Medicine
- American Society for the Prevention of Cruelty to Animals
- American Society of Clinical Oncology
- American Society of Magazine Editors
- American Society of Newspaper Editors
- American Software, Inc.
- American Standard Companies, Inc.
- American Standard Energy Corp.
- American Symphony Orchestra
- American Technical Ceramics Corporation
- American Theater Wing
- American Tower Corporation
- American University
- American Vanguard
- American Vintage
- American Wind Energy Association
- American-Arab Anti-Discrimination Committee
- AmericanLife TV Network
- Americans for Democratic Action
- Americans for Job Security
- Americans for Prosperity Foundation
- Americans for Tax Reform
- Americans United for Separation of Church and State
- Americas Best Value Inn
- AmericInn (Corporate)
- AmeriCredit Corp
- Amerigroup
- Ameriprise Financial Inc
- AMERIPRISE FINANCIAL SERVICES
- AmerisourceBergen Corporation
- Ameristar Casinos, Inc.
- AmeriSuites (Corporate)
- Ametek
- Amex Carbonates and Chemicals
- Amforge Industries
- Amgen Inc.
- Amherst College
- Ami Computers (India)
- Amica Mutual Insurance
- Amigo Exports
- Aminaka Wilmont
- Amines and Plasticizers
- Aminex Chemicals
- Amison Foods
- Amit International
- Amit Securities
- Amit Spinning
- Amkar Perm
- Amkor Technology, Inc.
- Amlin
- Ammana Bio Pharma
- AMN Healthcare Services Inc
- Amnesty International
- Amobee
- Among the Oak & Ash
- AMP Limited
- AMP Radio Networks
- Amphenol
- Ampro Products
- AMR Corporation
- Amra Bangalee
- Amrapali Industries
- Amraworld Agrico
- Amrep
- Amrit Corp
- Amrut Credit Corporation
- Amrut Industries
- Amrutanjan Health Care