| # | Name | Location | Applications |
|---|---|---|---|
| 1. | H. D. Industries, Inc. | 🇺🇸 Jacksonville, TX, United States | 2 |
| 2. | H.D. Industries, Inc. | 🇺🇸 Jacksonville, TX, United States | 2 |
| 3. | HD IMMUNE GMBH | 🇦🇹 Vienna, Austria | 2 |
| 4. | HD Inspiration Holding B.V. | 🇳🇱 Emmeloord, Netherlands | 1 |
| 5. | HD INSPIRATION HOLDING B.V. | 🇳🇱 AA Emmeloord, Netherlands | 2 |
| 6. | HD INSPIRATION HOLDING B.V. | 🇳🇱 LELYSTAD, Netherlands | 1 |
| 7. | HDI Railing Systems | 🇺🇸 Columbia, PA, United States | 2 |
| 8. | HDIPY, INC. | 🇺🇸 Clearwater, FL, United States | 1 |
| 9. | HDIV SECURITY, S.L. | 🇪🇸 Guipúzcoa, Spain | 1 |