A
- A. Schulman, Inc. (NASDAQ:SHLM)
- A.H. Belo Corporation (NYSE:AHC)
- A.P Pharma Inc (OTC:APPA)
- A.T. Cross Company (NASDAQ:ATX)
- A123 Systems (NASDAQ:AONE)
- AAR Corp. (NYSE:AIR)
- Aaron's Inc (NYSE:AAN)
- Aastra Technologies (TSX:AAH)
- Aastrom Biosciences (NASDAQ:ASTM)
- Abaxis (NYSE:ABAX)
- ABB Ltd (NYSE:ABB)
- Abbey Protection (L:ABB)
- Abbott Laboratories (NYSE:ABT)
- Abbvie Inc (NYSE:ABBV)
- Abcam (L:ABC)
- Abercrombie & Fitch Co. (NYSE:ANF)
- Aberdeen Asset Management (L:ADN)
- Abertis Infraestructuras SA (EU:ABE)
- Abiomed Inc (NASDAQ:ABMD)
- AbitibiBowater Inc (TSX:ABH, NYSE:ABH)
- ABM Industries (NYSE:ABM)
- Abovenet (NYSE:ABVT)
- Abraxas Petroleum (NASDAQ:AXAS)
- Absolute Software (TSX:ABT)
- Acacia Research (NASDAQ:ACTG)
- Acadia Healthcare Company (NASDAQ:ACHC)
- ACADIA Pharmaceuticals (NYSE:ACAD)
- Acadia Realty Trust (NYSE:AKR)
- Acadian Mining Corp (TSX:ADA)
- Acadian Timber (TSX:ADN)
- Acasti Pharma (TSX VENTURE:APO)
- Accelrys (NASDAQ:ACCL)
- Accenture Plc (NYSE:ACN)
- Access Intelligence (L:ACC)
- Access Midstream Partners (NYSE:ACMP)
- Access National (NASDAQ:ANCX)
- Acciona SA (EU:AJ3)
- Acco Brands (NYSE:ACCO)
- Accor S.A. (EU:AC)
- Accretive Health (NYSE:AH)
- Accumuli Plc (L:ACM)
- Accuray Inc (NASDAQ:ARAY)
- Accuride (NYSE:ACW)
- Ace Aviation Holdings Inc. (TSX:ACE.A)
- ACE Limited (NYSE:ACE)
- AcelRx Pharmaceuticals Inc (NASDAQ:ACRX)
- Acerinox (EU:ACE1)
- Achillion Pharmaceuticals (NASDAQ:ACHN)
- ACI Worldwide (NASDAQ:ACIW)