?- Smurfit Kappa Group
- DS Smith PLC
- WestRock
- Mondi Group
- Hamburger Containerboard GmbH (Prinzhorn Group)
- Papierfabrik Palm GmbH & Co KG
- Metsa Board Oyj
- Progroup AG
- Emin Leydier SA
- Svenska Cellulosa Aktiebolaget - SCA
- Stora Enso Oyj