- Argos
- Ash Grove Cement
- Buzzi Unicem USA
- Capitol Aggregates
- Cemex
- Dragon Products
- Eagle Materials
- GCC
- Lafarge Holcim
- Lehigh Cement Company
- Lhoist
- Penobscot Energy Recovery Company
- Sappi Fine Paper
- Titan America
- Martin Marietta
- USLM
- Vulcan Materials
- Georgia Pacific
- International Paper
- WestRock
- Domtar
- Weyerhaeuser
- Boise
- Rayonier
- Graphic Packaging
- Packaging Corporation of America