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Related parties - Balances recognized in assets and liabilities and amounts transacted during the period (Details) - BRL (R$) R$ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | R$ 84,061 |  | R$ 87,493
Liabilities | (4,640) |  | (1,076,419)
Sales (purchase) | 97,592 | R$ 84,979 |
Dividends and interest on own capital payable | 1,997 |  | 2,200,917
Trade accounts receivable |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 81,018 |  | 83,545
Other assets |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 3,043 |  | 3,948
Trade accounts payable |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities | (4,640) |  | (1,457)
Dividends and interests on own capital payable |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities |  |  | (1,074,962)
Transactions with majority shareholders |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 14 |  | 4
Liabilities | (576) |  | (1,074,983)
Sales (purchase) | (543) | 22 |
Suzano Holding S.A. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 14 |  | 4
Liabilities | (576) |  | (630,387)
Sales (purchase) | (543) | 22 |
Controller |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities |  |  | (336,205)
Managements and related persons |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets |  |  |
Liabilities |  |  | (55,627)
Sales (purchase) |  |  |
Alden Fundo de Investimento em Ações |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities |  |  | (52,764)
Transactions with companies of the Suzano Group and other related parties |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 84,047 |  | 87,489
Liabilities | (4,064) |  | (1,436)
Sales (purchase) | 98,135 | 84,957 |
Management |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 128 |  | 61
Sales (purchase) | 256 | 290 |
Bexma Participacoes Ltda. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 1 |  |
Sales (purchase) | 4 | 3 |
Naman Capoital Ltda. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 2 |  |
Sales (purchase) | 4 | 4 |
Civelec Participações Ltda |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 2,895 |  | 3,860
Sales (purchase) |  |  |
Fundacao Arymax |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 2 |  |
Sales (purchase) | 3 | 3 |
Ibema Companhia Brasileira de Papel |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 81,018 |  | 83,343
Liabilities | (2,417) |  | (1,413)
Sales (purchase) | 102,103 | 87,768 |
Instituto Ecofuturo - Futuro Para o Desenvolvimento Sustentavel |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets | 1 |  | 21
Liabilities | (1,226) |  |
Sales (purchase) | (3,736) | (2,837) |
IPFL Holding S.A |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets |  |  | 1
Sales (purchase) | 3 | 2 |
Mabex Representacoes e Participacoes Ltda. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities | (406) |  | (23)
Sales (purchase) | (1,007) | (629) |
Nemonorte Imoveis e Participacoes Ltda. |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Liabilities | (15) |  |
Sales (purchase) | (75) | (74) |
Woodspin Oy |  |  |
Disclosure of Transactions Between Related Parties [Line Items] |  |  |
Assets |  |  | R$ 203
Sales (purchase) | R$ 580 | R$ 427 |

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