1. Afton Chemical Limited by NewMarket Corporation
2. Akzo Nobel N.V.
3. AMETEK Inc.
4. Baker Hughes Company
5. BASF SE
6. BRB International B.V. by PETRONAS Chemicals Group Berhad
7. Chevron Corporation
8. Clariant International Ltd.
9. Croda International PLC
10. Ecolab Inc.
11. Evonik by RAG-Stiftung
12. Halliburton Energy Services Inc.
13. Infineum International Limited
14. Lucas Oil Products Inc.
15. The Lubrizol Corporation by Berkshire Hathaway Inc.