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v3.25.3

Investments - Investments in Associates and Joint Ventures (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 31, 2025 BRL (R$) | Sep. 30, 2025 BRL (R$) | Sep. 30, 2024 BRL (R$) | Sep. 30, 2025 BRL (R$) | Sep. 30, 2025 BRL (R$) € / shares | Sep. 30, 2024 BRL (R$) | Sep. 30, 2024 BRL (R$) € / shares | Dec. 31, 2024 BRL (R$) | Dec. 31, 2023 BRL (R$)
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Equity |  | R$ 45,258,425,000 | R$ 41,601,758,000 | R$ 45,258,425,000 | R$ 45,258,425,000 | R$ 41,601,758,000 | R$ 41,601,758,000 | R$ 32,415,575,000 | R$ 44,810,300,000
Income (expenses) of the period |  | 1,961,387,000 | 3,237,351,000 | R$ 13,321,518,000 |  | (308,134,000) |  |  |
% |  |  |  | 100.00% |  |  |  | 100.00% |
In the income (expenses) for the period |  |  |  | R$ (239,671,000) |  | (14,842,000) |  |  |
Goodwill |  | 189,846,000 |  | 189,846,000 | 189,846,000 |  |  | R$ 225,486,000 |
Total Investments, including Goodwill and Financial Instruments |  | 1,417,377,000 |  | 1,417,377,000 | 1,417,377,000 |  |  | 1,816,923,000 |
Realization of exchange variation on investments abroad |  |  |  | (15,636,000) |  |  |  |  |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  |  | 88,871,000 |  |  |  |  |
Other Operating Income (Expense) from Disposal of Property, Plant and Equipment and Biological Assets |  |  |  | 272,228,000 |  | 132,693,000 |  |  |
Associate | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | 55,434,000 |  | 55,434,000 | 55,434,000 |  |  | 125,316,000 |
In the income (expenses) for the period |  |  |  | R$ (62,334,000) |  | (21,865,000) |  |  |
Ensyn Corporation | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Participation equity (%) |  |  |  | 24.80% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | (5,187,000) |  | R$ (5,187,000) | (5,187,000) |  |  | 2,000 |
In the income (expenses) for the period |  |  |  | (20,213,000) |  | (2,289,000) |  |  |
Spinnova Plc |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Goodwill |  | 189,846,000 |  | 189,846,000 | 189,846,000 |  |  | 225,486,000 |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  |  | R$ (63,634,000) |  |  |  |  |
Spinnova Plc | Component Of Other Operating Expenses Related To SPA ClosingConditions |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Other Operating Income (Expense) from Disposal of Property, Plant and Equipment and Biological Assets | R$ (28,679) |  |  |  |  |  |  |  |
Spinnova Plc | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Participation equity (%) |  |  |  | 18.76% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | 52,479,000 |  | R$ 52,479,000 | 52,479,000 |  |  | 95,254,000 |
In the income (expenses) for the period |  |  |  | R$ (40,714,000) |  | (19,576,000) |  |  |
Simplifyber, Inc. (Indirect) | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Participation equity (%) |  |  |  | 13.91% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | 7,605,000 |  | R$ 7,605,000 | 7,605,000 |  |  | 30,060,000 |
In the income (expenses) for the period |  |  |  | R$ (1,407,000) |  |  |  |  |
Allotrope Energy Ltd [Member] | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Participation equity (%) |  |  |  | 20.00% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | 537,000 |  | R$ 537,000 | 537,000 |  |  |  |
Joint ventures |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | 209,756,000 |  | 209,756,000 | 209,756,000 |  |  | 328,055,000 |
In the income (expenses) for the period |  |  |  | R$ (113,703,000) |  | 7,023,000 |  |  |
Biomas | Country of domicile |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Participation equity (%) |  |  |  | 16.66% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | 5,802,000 |  | R$ 5,802,000 | 5,802,000 |  |  | 2,923,000 |
In the income (expenses) for the period |  |  |  | R$ (4,618,000) |  | (3,431,000) |  |  |
Ibema Companhia Brasileira de Papel | Country of domicile |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Participation equity (%) |  |  |  | 49.90% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | 198,476,000 |  | R$ 198,476,000 | 198,476,000 |  |  | 193,901,000 |
In the income (expenses) for the period |  |  |  | R$ 13,410,000 |  | 27,904,000 |  |  |
F&E Technologies LLC | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Participation equity (%) |  |  |  | 50.00% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  | 5,478,000 |  | R$ 5,478,000 | 5,478,000 |  |  | 6,378,000 |
In the income (expenses) for the period |  |  |  |  |  |  |  |  |
Woodspin Oy |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Share Of Profit Loss Of Investments Accounted For Using Equity Method |  |  |  | R$ (117,848,000) |  |  |  |  |
Woodspin Oy | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Participation equity (%) |  |  |  | 50.00% |  |  |  |  |
Investments Accounted for Using Equity Method, Excluding Goodwill |  |  |  |  |  |  |  | 124,853,000 |
In the income (expenses) for the period |  |  |  | (122,495,000) |  | (17,450,000) |  |  |
Total other investments evaluated at fair value |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
In the income (expenses) for the period |  |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 962,341,000 |  | R$ 962,341,000 | 962,341,000 |  |  | 1,138,066,000 |
Bem Agro Integração e Desenvolvimento S.A. (Indirect) |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
% |  |  |  | 5.82% |  |  |  |  |
Bem Agro Integração e Desenvolvimento S.A. (Indirect) | Country of domicile |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 3,461,000 |  | R$ 3,461,000 | 3,461,000 |  |  | 4,026,000 |
Celluforce Inc. (Direct) |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
% |  |  |  | 8.28% |  |  |  |  |
Celluforce Inc. (Direct) | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 24,681,000 |  | R$ 24,681,000 | 24,681,000 |  |  | 27,823,000 |
Nfinite Nanotechnology Inc. (Indirect) |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
% |  |  |  | 4.90% |  |  |  |  |
Nfinite Nanotechnology Inc. (Indirect) | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 5,452,000 |  | R$ 5,452,000 | 5,452,000 |  |  | 6,347,000 |
Lenzing Aktiengesellschaft (Indirect) |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
% |  |  |  | 15.00% |  |  |  |  |
Lenzing Aktiengesellschaft (Indirect) | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income |  | 928,747,000 |  | R$ 928,747,000 | 928,747,000 |  |  | 1,099,870,000 |
Total Goodwill |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Goodwill |  | 189,846,000 |  | 189,846,000 | 189,846,000 |  |  | R$ 225,486,000 |
Impairment loss (reversal of impairment loss) recognised in profit or loss |  |  |  | (63,634,000) |  |  |  |  |
Ensyn Corporation |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Equity |  | (20,917,000) |  | (20,917,000) | (20,917,000) |  |  |  |
Income (expenses) of the period |  |  |  | (76,085,000) |  |  |  |  |
Spinnova Plc |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Equity |  | 279,740,000 |  | 279,740,000 | R$ 279,740,000 |  |  |  |
Income (expenses) of the period |  |  |  | (217,242,000) |  |  |  |  |
NASDAQ, Nordic Growth Market, Average Share Price | € / shares |  |  |  |  | R$ 0.61 |  | R$ 0.95 |  |
Biomas | Country of domicile |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Equity |  | 34,828,000 |  | 34,828,000 | R$ 34,828,000 |  |  |  |
Income (expenses) of the period |  |  |  | (29,371,000) |  |  |  |  |
Ibema Companhia Brasileira de Papel | Country of domicile |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Equity |  | 397,748,000 |  | 397,748,000 | 397,748,000 |  |  |  |
Income (expenses) of the period |  |  |  | 26,873,000 |  |  |  |  |
F&E Technologies LLC | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Equity |  | 10,956,000 |  | 10,956,000 | 10,956,000 |  |  |  |
Income (expenses) of the period |  |  |  |  |  |  |  |  |
Woodspin Oy | Foreign countries |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Equity |  | 234,894,000 |  | 234,894,000 | 234,894,000 |  |  |  |
Income (expenses) of the period |  |  |  | (26,427,000) |  |  |  |  |
Simplifyber, Inc. (Indirect) |  |  |  |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |  |  |  |
Equity |  | R$ 54,672,000 |  | 54,672,000 | R$ 54,672,000 |  |  |  |
Income (expenses) of the period |  |  |  | R$ (10,115,000) |  |  |  |  |

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