| Company Name | Entity type | Parent/Subsidiary/Independent | Headquarters | No. of Employees | Annual Revenue ($M) | |
|---|---|---|---|---|---|---|
| Exxon Mobil Corp | Public | Parent | United States of America | 62,000 | 334,697 | |
| Linde plc | Public | Parent | United Kingdom | 66,195 | 32,854 | |
| Air Liquide SA | Public | Parent | France | 67,778 | 29,856 | |
| Mangalore Refinery and Petrochemicals Ltd | Public | Subsidiary (of Oil and Natural Gas Corp Ltd) | India | 2,550 | 12,744 | |
| Cummins Inc | Public | Parent | United States of America | 75,500 | 34,065 | |
| SK Ecoplant Co Ltd | Private | Subsidiary (of SK Inc) | South Korea | 3,548 | 47,959 | |
| Johnson Matthey Plc | Public | Parent | United Kingdom | 11,685 | 15,968 | |
| MOL Hungarian Oil and Gas Plc | Public | Parent | Hungary | 25,132 | 25,255 | |
| Cadent Gas Ltd | Private | Subsidiary (of Quadgas MidCo Ltd ) | United Kingdom | 6,018 | 2,884 | |
| Rosneft Oil Co | Public | Parent | Russia | 334,600 | 107,241 | |
| Nippon Sanso Holdings Corp | Public | Subsidiary (of Mitsubishi Chemical Group Corp) | Japan | 19,579 | 9,272 | |
| The AES Corp | Public | Parent | United States of America | 9,600 | 12,668 | |
| Access Holdings PLC | Public | Parent | Nigeria | 7,334 | 4,054 | |
| Algonquin Power & Utilities Corp | Public | Parent | Canada | 3,946 | 2,698 | |
| China Northern Rare Earth Group High-Tech Co Ltd | Public | Parent | China | 9,866 | 4,736 | |
| Tecnicas Reunidas SA | Public | Parent | Spain | 7,735 | 4,472 | |
| China National Petroleum Corp | Government | Parent | China | XYZ | 505,323 | |
| OCI NV | Public | Subsidiary (of Indutrade AB) | Netherlands | 1,146 | 1,963 | |
| Plug Power Inc | Public | Parent | United States of America | 3,868 | 891 | |
| Hyundai Rotem Co | Public | Parent | South Korea | 3,783 | 2,748 | |
| Icelandic New Energy Ltd | Private | Independent | Iceland | XYZ | XYZ | |
| Hygen Energy Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Hydrogen Technology Corp | Private | Independent | United States of America | XYZ | XYZ | |
| Trubnaya Metallurgicheskaya Kompaniya | Public | Parent | Russia | 39,109 | 5,824 | |
| Green Hydrogen Ltd. | Private | Subsidiary (of Summerleaze Ltd ) | United Kingdom | XYZ | XYZ | |
| WEW GmbH | Private | Independent | Germany | XYZ | XYZ | |
| Hydrogen Freehold and Leasehold Real Estate Investment Trust | Public | Independent | Thailand | XYZ | XYZ | |
| Hydrogen Future Industries Plc | Public | Independent | United Kingdom | XYZ | XYZ | |
| Chart Industries Inc | Public | Parent | United States of America | 11,637 | 3,353 | |
| ALSTOM Hydrogene SAS | Private | Subsidiary (of Alstom SA ) | France | XYZ | XYZ | |
| GKN Sinter Metals LLC | Private | Subsidiary (of Dowlais Group Plc ) | United States of America | XYZ | XYZ | |
| Hydrogen Canada Corp | Private | Independent | Canada | XYZ | XYZ | |
| Wild Hydrogen Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Clean Power Hydrogen Group Ltd | Private | Subsidiary (of Clean Power Hydrogen Plc ) | United Kingdom | XYZ | XYZ | |
| Dongfang Electric Corporation Ltd | Public | Parent | China | 17,426 | 8,579 | |
| HyEdge, Inc. | Private | Independent | United States of America | XYZ | XYZ | |
| Ryze Hydrogen Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Standard Hydrogen Corp | Private | Independent | United States of America | XYZ | XYZ | |
| Hydrogen Venture Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Hidrojen Peroksit Sanayi Ve Ticaret A.S. | Private | Independent | Turkey | XYZ | XYZ | |
| POSCO FUTURE M Co Ltd | Public | Subsidiary (of POSCO Holdings Inc) | South Korea | 1,324 | 3,646 | |
| Sumco Corp | Public | Parent | Japan | 9,189 | 3,259 | |
| Evolvient Capital Plc | Private | Parent | United Kingdom | XYZ | XYZ | |
| Henan Jinyuan Hydrogenated Chemicals Co Ltd | Public | Subsidiary (of Henan Jinma Energy Co Ltd ) | China | XYZ | XYZ | |
| HyCC BV | Private | Independent | Netherlands | XYZ | XYZ | |
| Shanghai Yi Gong Hydrogen Energy Technology Co Ltd | Private | Independent | China | XYZ | XYZ | |
| Stargate Hydrogen Solutions OU | Private | Independent | Estonia | XYZ | XYZ | |
| Shanghai Ji Chong Hydrogen Energy Technology Co Ltd | Private | Independent | China | XYZ | XYZ | |
| EBS Hydrogen AG | Private | Independent | Switzerland | XYZ | XYZ | |
| Shell Hydrogen BV | Private | Subsidiary (of Shell plc ) | Netherlands | XYZ | XYZ |
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