| # | Name | Location | Applications |
|---|---|---|---|
| 1. | H&K Group, Inc. | 🇺🇸 Skipjack, PA, United States | 1 |
| 2. | HK GRAPHENE TECHNOLOGY CORPORATION | 🇺🇸 Pasadena, CA, United States | 2 |
| 3. | HKG CORPORATION LIMITED | 🇨🇳 Shenzhen, Guangdong, China | 1 |
| 4. | HKG TECHNOLOGIES LIMITED | 🇭🇰 Hong Kong, Hong Kong | 1 |