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Investments | 6 Months Ended
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Jun. 30, 2025
Investments [Abstract] |
Disclosure of investments accounted for using equity method [text block] | 14 INVESTMENTS 14.1 Investments breakdown
|  | 06/30/2025 |  | 12/31/2024
Investments in associates and joint ventures |  | 292,267 |  |  | 453,371 |
Goodwill |  | 180,981 |  |  | 225,486 |
Other investments evaluated at fair value through other comprehensive income |  | 931,722 |  |  | 1,138,066 |
|  | 1,404,970 |  |  | 1,816,923 |
Investments |  | 1,406,416 |  |  | 1,816,923 |
Provision for loss on investments in subsidiaries |  | (1,446) |  |  |  |
|  | 1,404,970 |  |  | 1,816,923 |
14.2 Investments in associates and joint ventures
Information of investees as at |  | Company Participation
|  |  |  |  | 06/30/2025 |  | Carrying amount |  | In the income (expenses) for the period
| Equity |  | Income (expenses) of the period |  | Participation equity (%) |  | 06/30/2025 |  | 12/31/2024 |  | 06/30/2025 |  | 06/30/2024
Associate |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign |  |  |  |  |  |  |  |  |  |  |  |  |
Ensyn Corporation | (5,086) |  |  | (12,882) |  |  | 24.80 | % |  | (1,261) |  |  | 2 |  |  | (4,539) |  |  | (170) |
Spinnova Plc (1) | 457,112 |  |  | (49,051) |  |  | 18.76 | % |  | 85,754 |  |  | 95,254 |  |  | (9,155) |  |  | (9,065) |
Simplifyber, Inc. | 58,406 |  |  | (4,041) |  |  | 13.91 | % |  | 8,124 |  |  | 30,060 |  |  | (562) |  |  |
|  |  |  |  |  |  | 92,617 |  |  | 125,316 |  |  | (14,256) |  |  | (9,235) |
Joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic (Brazil) |  |  |  |  |  |  |  |  |  |  |  |  |
Biomas - Serviços Ambientais, Restauração e Carbono Ltda. | (1,106) |  |  | (20,302) |  |  | 16.66 | % |  | (184) |  |  | 2,923 |  |  | (3,107) |  |  | (2,001) |
Ibema Companhia Brasileira de Papel | 389,205 |  |  | 18,330 |  |  | 49.90 | % |  | 194,213 |  |  | 193,901 |  |  | 9,147 |  |  | 19,040 |
Foreign |  |  |  |  |  |  |  |  |  |  |  |  |
F&E Technologies LLC | 11,242 |  |  |  |  |  | 50.00 | % |  | 5,621 |  |  | 6,378 |  |  |  |  |  |  |
Woodspin Oy (2) | 235,697 |  |  | (22,635) |  |  | 50.00 | % |  |  |  |  | 124,853 |  |  | (117,232) |  |  | (11,318) |
|  |  |  |  |  |  | 199,650 |  |  | 328,055 |  |  | (111,192) |  |  | 5,721 |
Other investments evaluated at fair value through other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |
Bem Agro Integração e Desenvolvimento S.A. |  |  |  |  | 5.82 | % |  | 3,551 |  |  | 4,026 |  |  |  |  |  |
Celluforce Inc. |  |  |  |  | 8.28 | % |  | 25,897 |  |  | 27,823 |  |  |  |  |
Nfinite Nanotechnology Inc. |  |  |  |  | 4.90 | % |  | 5,594 |  |  | 6,347 |  |  |  |  |  |
Lenzing Aktiengesellschaft |  |  |  |  | 15.00 | % |  | 896,680 |  |  | 1,099,870 |  |  |  |  |  |
|  |  |  |  |  |  | 931,722 |  |  | 1,138,066 |  |  |  |  |  |  |
Goodwill (2) |  |  |  |  |  |  | 180,981 |  |  | 225,486 |  |  | (63,634) |  |  |
|  |  |  |  |  |  | 180,981 |  |  | 225,486 |  |  | (63,634) |  |  |
|  |  |  |  |  |  | 1,404,970 |  |  | 1,816,923 |  |  | (189,082) |  |  | (3,514) |
(1)The average share price quoted on the Nasdaq First North Growth Market (NFNGM) was EUR0.48 on June 30, 2025 and EUR0.95 in December 31, 2024. (2)In June 2025, the Company and Spinnova Plc entered into a non-binding term sheet with the objective of terminating the corporate partnership in the joint venture Woodspin Oy. This will result in the Company disposing of its entire interest in both Woodspin Oy and Suzano Finland Oy to Spinnova Plc, for the amount of one euro each. As a result of this transaction, which is still subject to definitive formalization, the following accounting effects were recognized: (i) R$(117,848) related to the impairment of the investment and R$(15,636) related to the realization of other comprehensive income from the joint venture Woodspin Oy and (ii) R$(63,634) related to the write-off of goodwill from the associate Spinnova Plc. These impacts were recognized in the income (loss) from associates and joint ventures line item.

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- Definition The disclosure of investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 10 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_10_e&doctype=Standard -URIDate 2024-03-27 + Details
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