| Hye Lites Industries, LLC ( Elk Grove, IL ) | HyGene AG( Neuhausen am Rheinfall ) | Hygoform A.S. ( Oslo, NO ) |
| HyEnergy Systems, Inc. | Hy-Gene Biomedical Corporation ( Columbus, OH ) | Hygrade Metal Moulding Manufacturing Corp. ( Farmingdale, NY ) |
| HyEnergy Systems, Inc. ( Austin, TX ) | Hy-Gene Biomedical, Inc. ( Charlotte, NC ) | Hygrama AG |
| Hy-Energy, LLC ( Newark, CA ) | Hygie Canada Inc. | Hygrama AG( Rotkreuz ) |
| Hyeon; Taeg-Hwan( Seoul ) | Hygieia Health Co., Ltd. | Hygrama AG ( Rotkreuz, CH ) |
| Hyer Industries, Inc. ( Pembroke, MA ) | Hygiene-Technik Inc.( Beamsville ) | Hygrama AG( Zug ) |
| Hye-San Park and Kanematsu Industrial Co., Ltd. | Hygiene-Technik Inc. ( Beamsville, CA ) | Hygrodynamics, Inc. ( Jessup, MD ) |
| Hy-Flex Corp. ( Cambridge City, IN ) | Hygiene-Technik Inc. ( Beamsville, Ontario ) | Hygrotek Corporation ( Cambridge, MD ) |
| Hyfotec Sweden AB( Borlange ) | Hygiene-Technik Inc. ( Ontario, CA ) | Hygrowick-International Aps( Horsholm ) |
| Hygeia Biomedical Research Inc. ( Monsey, NY ) | Hygiene-Tecknik Inc. ( Beamsville, Ontario ) | HyHeat AB( Stockholm ) |
| HYGEIA II MEDICAL GROUP, INC. ( Carlsbad, CA ) | Hygienic Pigging Systems Limited | HyHeat AB ( Stockholm, SE ) |
| Hygeia Sciences, Inc. ( Newton, MA ) | Hyglo Systems AB( Stockholm ) | |
| Hygena Limited( Liverpool ) | Hyglo Systems AB ( Stockholm, SE ) | |