1. Carmeuse
2. Cemex
S.A.B. de C.V.
3. Cheney Limestone Company
4. Cornish Lime Company Limited
5. GCCP Resources Limited
6. Graymont Limited
7. Imerys S.A.
8. Lhoist Group
9. Minerals Technologies Inc.
10. Mississippi Lime Company
11. Pete Lien & Sons Inc.
12. Saudi Lime Industries Co.
13. Sigma Minerals Ltd.
14. Sumitomo Osaka Cement Co. Ltd.
15. United States Lime & Minerals Inc.