| Republic of Singapore, Embassy | 07/25/2002 | 07/31/2003 | 3501 International Place, N.W. 20008 | DC | Fontheim International, LLC | 5501 | 11/21/2001 | 11/30/2003 |
| Singapore Economic Development Board | 10/28/2016 | 08/31/2018 | EBD 250 Northbridge Road #22-00 Raffles City Tower Singapore 179101 | | Doremus & Company | 6387 | 10/28/2016 | 08/31/2018 |
| Singapore Airlines | 03/14/1994 | 09/30/1998 | | | InterVISTAS-ga2 Consulting, Inc. | 4902 | 03/14/1994 | 09/30/2004 |
| Republic of Singapore, Embassy | 09/13/1995 | 02/28/2013 | Washington | DC | Reed, T. Dean | 5044 | 09/13/1995 | 06/01/2021 |
| Textile & Garment Manufacturers' Association of Singapore | 07/31/1992 | 02/26/1993 | | | Sandler, Travis & Rosenberg, P.A. | 4698 | 07/31/1992 | 02/26/1993 |
| Republic of Singapore, Embassy | 04/26/1996 | 03/31/2003 | Washington | DC | APCO Worldwide, Inc. | 4561 | 09/03/1991 | 12/31/2011 |
| Seven Seas Cruise Line, Ltd. | 11/14/1991 | 12/30/1992 | | | Rockey Company, Inc. | 4594 | 11/14/1991 | 11/25/1998 |
| Government of the Republic of Singapore | 08/23/1985 | 12/31/1987 | | | St. Maxens & Company | 3726 | 08/23/1985 | 03/23/1987 |
| Singapore Tourism Promotion Board | 07/19/1988 | 04/01/1994 | Beverly Hills | CA | Fontayne Group, Inc. | 3752 | 10/30/1985 | 10/31/2001 |
| National Computer Board (Singapore) | 12/18/1985 | 08/31/1988 | | | National Computer Board of Singapore | 3764 | 12/18/1985 | 08/31/1988 |
| Monetary Authority of Singapore | 04/07/1987 | 11/30/1988 | | | Colby, William E. | 3957 | 04/07/1987 | 08/03/1993 |
| Singapore Tourist Promotion Board | 03/24/1987 | 01/01/1989 | Singapore | | Berkhemer Kline/Golin Harris | 3952 | 03/24/1987 | 07/18/1989 |
| Singapore Trade Development Board | 05/27/1988 | 05/16/1995 | | | Crowell Global Advisors | 3988 | 05/28/1987 | |
| Government of Singapore | 12/27/1985 | 04/15/1986 | Washington | DC | Michael K. Deaver & Associates | 3734 | 09/18/1985 | 04/15/1987 |
| Temasek Holdings | 04/10/2008 | 12/31/2014 | 60 B Orchard Road #06-18 Singapore | | IPG DXTRA, Inc | 3911 | 12/01/1986 | 12/31/2023 |