1. Advent Technologies Holdings Inc.
2. Air Liquide S.A.
3. Cummins Inc.
4. Erre Due s.p.a.
5. Green Hydrogen Systems A/S
6. h2e Power Systems Inc.
7. Hoeller Electrolyzer GmbH
8. HydrogenPro ASA
9. iGas energy GmbH
10. INEOS AG
11. ITM Power PLC
12. John Cockerill SA
13. Linde PLC
14. MAN Energy Solutions SE
15. Nel ASA
16. Next Hydrogen Solutions Inc.
17. Ohmium International Inc.
18. PERIC Hydrogen Technologies Co. Ltd
19. Plug Power Inc.
20. Siemens Energy AG
21. Sono-Tek Corporation
22. Sumitomo Corporation
23. thyssenkrupp AG
24. Toshiba Corporation