| Company | Role | Joined | Share Capital |
|---|---|---|---|
| MAGNESITA MINERACAO S.A. | Diretor (10) | 8/14/2025 | R$ 427,984,466.92 |
| MAGNESITA REFRATARIOS S.A | Diretor (10) | 7/7/2025 | R$ 1,295,287,505.11 |
| RHI REFRATARIOS BRASIL LTDA. | Administrador (5) | 8/5/2025 | R$ 381,420,659.00 |