| 1 | Air Liquide | France | Industrial gases, all production methods | Global leader, large-scale projects | Major producer and infrastructure developer |
| 2 | Linde plc | UK/Ireland | Industrial gases, all production methods | Global leader, large-scale projects | Major producer and infrastructure developer |
| 3 | Air Products and Chemicals | USA | Industrial gases, all production methods | Global leader, large-scale projects | Major blue/green hydrogen project developer |
| 4 | China Energy Investment Group | China | Coal gasification (grey/brown) | World’s largest single producer | Massive scale from coal for chemical use |
| 5 | Sinopec | China | Refining by-product, grey/blue projects | Major national producer | Building green hydrogen projects |
| 6 | Shell | UK/Netherlands | Refining by-product, blue/green projects | Major integrated energy company | Developing large hydrogen hubs globally |
| 7 | BP | UK | Refining by-product, blue/green projects | Major integrated energy company | Aiming for significant low-carbon hydrogen share |
| 8 | ExxonMobil | USA | Refining by-product, blue hydrogen projects | Major integrated energy company | Focusing on blue hydrogen with CCS |
| 9 | TotalEnergies | France | Refining by-product, blue/green projects | Major integrated energy company | Investing in green hydrogen projects |
| 10 | SABIC | Saudi Arabia | Steam methane reforming (grey) | Major chemical producer | Large consumer and producer for ammonia |
| 11 | BASF | Germany | Steam methane reforming (grey), green projects | Major chemical producer | Large consumer, transitioning to low-carbon |
| 12 | Yara International | Norway | Grey for ammonia, green projects | World’s largest ammonia producer | Pioneering green ammonia projects |
| 13 | CF Industries | USA | Grey for ammonia production | Major global fertilizer producer | Large-scale hydrogen consumer/producer |
| 14 | Messer Group | Germany | Industrial gases, merchant hydrogen | Large regional producer | Significant player in Europe and Americas |
| 15 | Taiyo Nippon Sanso | Japan | Industrial gases, merchant hydrogen | Major producer in Asia | Part of Nippon Sanso Holdings |
| 16 | Iwatani Corporation | Japan | Merchant hydrogen, fuel supply | Japan’s leading hydrogen supplier | Key player in Japan’s hydrogen economy |
| 17 | Uniper | Germany | Power generation, green/blue projects | Major European energy utility | Developing large-scale hydrogen import/production |
| 18 | ENGIE | France | Green hydrogen projects | Major European energy utility | Active developer of renewable hydrogen |
| 19 | Orsted | Denmark | Green hydrogen from offshore wind | Leading offshore wind developer | Developing large-scale green H2 projects |
| 20 | Siemens Energy | Germany | Electrolyzer manufacturing & projects | Technology provider and project developer | Developing large-scale electrolysis projects |
| 21 | ITM Power | UK | Electrolyzer manufacturing & projects | Leading PEM electrolyzer manufacturer | Builds integrated green hydrogen projects |
| 22 | Nel ASA | Norway | Electrolyzer manufacturing & projects | Leading alkaline/PEM electrolyzer maker | Provides solutions for green hydrogen production |
| 23 | Plug Power | USA | Electrolyzer manufacturing & green H2 | Leading fuel cell & electrolyzer company | Building green hydrogen network in US |
| 24 | Bloom Energy | USA | Solid oxide electrolyzers & projects | Technology provider and project developer | Developing high-efficiency electrolysis |
| 25 | Reliance Industries | India | Refining by-product, green hydrogen plans | Major Indian conglomerate | Aggressive plans for gigawatt-scale green H2 |
| 26 | Adani Group | India | Green hydrogen projects | Major Indian conglomerate | Large investments planned in green hydrogen |
| 27 | ACME Group | India | Green hydrogen and ammonia projects | Renewable project developer | Developing one of world’s largest green H2 plants |
| 28 | InterContinental Energy | Hong Kong | Green hydrogen mega-projects | Project developer | Developing multi-GW green hydrogen projects in Australia |
| 29 | Fortescue Future Industries | Australia | Green hydrogen projects | Project developer | Aiming for global large-scale green hydrogen production |
| 30 | Hyundai Motor Group | South Korea | Fuel cell production, green H2 projects | Automotive & technology conglomerate | Investing in global green hydrogen production |