Companies Manufacturing MgO Fillers
| Company Name | Products | Homepage | Remarks |
| Soulmaterials | MgO fillers | http://soulmaterlal.tcubemnet.com/ | Korea |
| Epsilon | Surface treatment of MgO particles | http://epsilons.co.kr/ | Korea |
| SukgyungAT | High purity fine MgO Powder | http://www.sukgyung.com/ | Korea |
| Denka | MgO fillers | https://www.denka.co.kr/ | Japan |
| Ube Material Industries | MgO fillers | https://www.ubematerial.com/ | Japan |
| Konoshima | MgO fillers | https://www.konoshima.co.jp/ | Japan |