| C & S Wholesale Grocers, Inc. |
| C H Robinson Worldwide, Inc. |
| CA |
| Cable and Wireless (Barbados) Limited |
| Cabot Corporation |
| Cadence Design Systems, Inc. |
| Cambridge University, ESOL |
| Campbell Soup Company |
| Canadian National Railway |
| Capgemini |
| Capgemini Consulting India Pvt. Ltd. |
| CapGemini U.S. LLC |
| Capital Group Companies |
| Capital One |
| Cardinal Health Inc. |
| Cargill, Inc. |
| Carlson Hotels Worldwide |
| CarMax Auto Superstores, Inc. |
| Carpenter Technology Corporation |
| Catalina Marketing Corporation |
| Caterpillar Inc. |
| CB & I |
| CBS News (division of Viacom) |
| Celanese International |
| CEMEX, Inc. |
| CenterPoint Energy |
| Centract/Brookfield |
| Cerner Corporation |
| CEZ, A.S. |
| CGI |
| CH2M Hill, Inc. |
| Charles Schwab & Co., Inc. |
| Charming Shoppes, Inc. |
| The Cheesecake Factory |
| Chemical Lime Company |
| Chemonics International Inc. |
| Chesapeake Energy Corporation |
| Chevron |
| Chico's FAS, Inc. |
| China Vanke |
| Chipotle Mexican Grill, Inc. |
| Chiquita Brands International |
| Chubb Group of Insurance Companies |
| Ciba Specialty Chemicals Corp |
| Cisco Systems, Inc. |
| CITGO Petroleum Corporation |
| Citibank, N.A. |
| Citigroup |
| Citizens Financial Group |
| CKE Restaurants Inc. |
| CLARCOR Inc |
| The Clearing House |
| The Clorox Company |
| Clyde & Co. |
| CNA |
| CNH America LLC |
| Coach Leatherware |
| Coca-Cola Bottling Co., Consolidated |
| The Coca-Cola Company |
| Coca-Cola Enterprises Inc. |
| Colgate-Palmolive Company |
| Columbia University |
| Comcast Corporation, Inc. |
| Commonwealth Bank of Australia |
| Compass Bank |
| Comptroller of the Currency |
| CompUSA, Inc. |
| Computer Sciences Corporation |
| Compuware Corporation |
| ConAgra Foods, Inc. |
| Conexant Systems |
| ConocoPhillips Company |
| CONSOL Energy, Inc. |
| Constellation Energy |
| Continental Airlines |
| CONVERGYS |
| Con-way Incorporated |
| Corn Products International, Inc. |
| Corning Incorporated |
| Corus Group Plc |
| Covance, Inc. |
| Covidien |
| Cox Enterprises, Inc. |
| CP-Lotus |
| Credence Systems |
| Credit Suisse |
| Crestline Hotels and Resorts, Inc. |
| CSA |
| CSI Leasing UK Ltd |
| CSK Auto, Inc. |
| CSX Transportation |
| Cummins, Inc. |
| CUNA Mutual Group |
| Cushman & Wakefield |
| CVI Laser Optics |
| CVS |
| Cytelligence Corporation |