| Company Name | Warning Date | Country of Origin |
| Carlton Marsh Limited | 05/02/2004 | Brazil, Panama, Singapore |
| Carter James SL | 20/11/2001 | Spain, USA |
| CB Peel & Associates | 22/05/2000 | USA |
| CD Equities Global Equities Partnership | 13/08/2009 | United Kingdom |
| Chamberlin Management Inc. | 04/12/2001 | Spain, Switzerland, USA |
| Chateau Schreiber Financial Management & Trust SA | 26/01/1999 | Switzerland |
| Citilife Financial Limited | 24/05/2012 | Ireland & United Kingdom |
| Clanvale Securities S.A. | 28/02/2002 | Venezuela |
| Claridon Asset Management | 15/05/2013 | United Kingdom |
| Clearing Services | 08/03/2002 | Spain |
| Clover International Advisers | 12/06/2002 | USA |
| Cogan Davis International | 06/08/2002 | Cayman Islands |
| Cohen Nesbit Group Limited | 07/06/2001 | Singapore |
| Colonial Tax Consultants | 26/09/2003 | USA |
| Cranley & Associates S.L. | 28/02/2002 | Spain |
| Crown Capital Management Corporation Limited | 09/01/2001 | Bahamas |
| CT Lambson & Associates, LLC | 10/09/2012 | USA |
| Currency Associates | 06/08/2002 | USA |
| Davidson Capital Partners | 03/04/2012 | USA |
| Dean Witter Consultancy | 03/04/2013 | USA |