| Rank | Abbreviation | Meaning |
|---|
| ***** | SIEC | State Independent Electoral Commission
| |
| *** | SIEC | Service Interacadémique des Examens et Concours
| |
| *** | SIEC | State Interoperability Executive Council
| |
| *** | SIEC | Suzhou International Exchange Center
| |
| ** | SIEC | Service des Investissements de l’Enseignement Catholique
| |
| ** | SIEC | Sie Communications, Inc.
| |
| * | SIEC | Southern Illinois Electric Cooperative
| |
| * | SIEC | Spherical Inertial Electrostatic Confinement
| |
| * | SIEC | Southern Indiana Education Center
| |
| * | SIEC | Suicide Information Education Centre
| |
| * | SIEC | Significantly Impede Effective Competition
| |
| * | SIEC | Southern Iowa Electric Cooperative
| |
| * | SIEC | Saudi Industrial Export Co
| |
| * | SIEC | Shanghai International Exhibition Co
| |
| * | SIEC | Societa Italiana di Ecografia Cardiovascolare
| |
| * | SIEC | suicide information education center
| |
| * | SIEC | Statewide Interoperability Executive Committee
| |
| * | SIEC | Sydney International Equestrian Centre
| |
| * | SIEC | S Island Electric Cooperative
| |
| * | SIEC | State Interoperability Executive Committees
| |
| * | SIEC | Statewide Interoperability Executive Council
| |
| * | SIEC | Shanghai Iiternational Exhibition Co
| |
| * | SIEC | Statewide Interoperable Executive Committee
| |
| * | SIEC | Suzhou International Expo Centre
| |
| * | SIEC | Siberian Import Export Company
| |