| # | Name | Location | Applications |
|---|---|---|---|
| 1. | GC ENVIRONMENTAL | 🇺🇸 ANAHEIM, CA, United States | 1 |
| 2. | GC Europe | 🇧🇪 Heverlee, Belgium | 1 |
| 3. | GC Europe N.V. | 🇧🇪 Leuven, Belgium | 1 |
| 4. | GCE DEUTSCHLAND GMBH | 🇩🇪 Losheim am See, Germany | 1 |
| 5. | GCE GROUP AB | 🇸🇪 Malmö, Sweden | 1 |
| 6. | GCE HOLDING AB | 🇸🇪 Malmo, Sweden | 8 |
| 7. | GCE Institute Inc. | 🇯🇵 Tokyo, Japan | 5 |
| 8. | GCE INSTITUTE INC. | 🇯🇵 Chuo-ku, Tokyo, Japan | 2 |
| 9. | GCE S.A.S | 🇫🇷 La Charite sur Loire, France | 1 |
| 10. | GCE SAS | 🇫🇷 La Charite sur Loire Cedex, France | 1 |