| # | Name | Location | Applications |
|---|---|---|---|
| 1. | H PLUS ENERGY LIMITED | 🇬🇧 Oxford, United Kingdom | 1 |
| 2. | H Plus Technologies Ltd. | 🇨🇦 Vancouver, BC, Canada | 1 |
| 3. | HP Leak Detection LLC | 🇺🇸 Prescott, AZ, United States | 2 |
| 4. | HPL Technologies GMBH | 🇩🇪 Aachen, Germany | 7 |
| 5. | HPL Technologies, Inc. | 🇺🇸 Mountain View, CA, United States | 1 |