1. Abb Ltd.
2. AVEVA Group Plc
3. Baker Hughes Company
4. Chevron Corporation
5. ConocoPhillips Company
6. Honeywell International Inc.
7. Maharashtra Seamless Ltd. by DP Jindal Group
8. Mott MacDonald Group
9. NIPPON STEEL ENGINEERING CO. LTD.
10. NOV Inc.
11. OMK
12. Plains All American Pipeline
L.P.
13. Saipem S.p.A.
14. Shengli Oil & Gas Pipe Holdings Limited
15. TechnipFMC PLC
16. Tenaris Global Services
17. TMK Group
18. Tricon Piping Systems Inc.
19. United States Steel Corporation
20. VALLOUREC
21. Welspun Group