1. Basf
2. Beijing New Building Material (Group) Co Ltd
3. Dow Chemicals
4. Gaf Materials Corporation
5. Huntsman Corporation
6. Johns Manville Corporation (Berkshire Hathaway)
7. Kingspan Group
8. Knauf Insulation Inc
9. Owens Corning
10. Paroc Group
11. Rockwool International A/S
12. Saint-Gobain Sa