| Cambridge Meridian Group Strategic management and marketing consulting for Fortune 100 and startup organizations |
| Camelot Marketing California based consultancy assists clients in anything from a simple press release to fully integrated marketing campaigns. |
| Campaigns That Work Provides internet marketing strategies and online promotions to businesses. |
| Campanola Consulting Providing management consulting, specializing in: Business Planning, Strategy Development, Product Planning, Marketing Conception and Implementation, and Alliance Management. Addresses the needs of business and government organizations. |
| Cannon Worldwide Develops actionable marketing strategies. |
| Capture Communications Marketing agency specialising in the development of online and wireless solutions |
| Celerity Works Strategic planning and business development consulting. |
| Chapell & Associates Helps companies develop privacy and data collection practices. Including building customer loyalty, mitigating against risk, and improving business process flow. |
| Coalescence Provides strategic community relations, cause related marketing, and employee volunteering services. |
| Coda Creative Inc Provides strategic marketing services to high-tech corporations across the country, specializing in helping small electronic commerce companies. |