Company's Operations - Equity interests (Details)
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3 Months Ended |
6 Months Ended |
9 Months Ended |
12 Months Ended |
Sep. 30, 2025 |
Mar. 31, 2026 |
Jun. 30, 2025 |
Sep. 23, 2025 |
Dec. 31, 2025 |
| Company's Operations [Line Items] |
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| % |
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100.00%
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100.00%
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| F&E Tecnologia do Brasil S.A. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Biofuel production, except alcohol
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| Fibria Celulose (USA) Inc. (Direct) | UNITED STATES |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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United States of America
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| % |
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100.00%
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100.00%
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| Fibria Terminal de Celulose de Santos SPE S.A. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Port operations
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| FuturaGene Ltda. (Direct) | England |
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| Company's Operations [Line Items] |
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| Main activity |
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Biotechnology research and development
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| Country |
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England
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| % |
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100.00%
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100.00%
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| FuturaGene Delaware Inc. (Indirect) | UNITED STATES |
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| Company's Operations [Line Items] |
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| Main activity |
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Biotechnology research and development
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| Country |
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United States of America
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| % |
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100.00%
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100.00%
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| FuturaGene Israel Ltda. (Indirect) | ISRAEL |
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| Company's Operations [Line Items] |
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| Main activity |
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Biotechnology research and development
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| Country |
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Israel
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| % |
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100.00%
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100.00%
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| FuturaGene Inc. (Indirect) | UNITED STATES |
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| Company's Operations [Line Items] |
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| Main activity |
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Biotechnology research and development
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| Country |
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United States of America
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| % |
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100.00%
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100.00%
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| Maxcel Empreendimentos e Participações S.A. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Holding
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| Itacel - Terminal de Celulose de Itaqui S.A. (Indirect) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Port operations
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| Mucuri Energética S.A. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Power generation and distribution
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| Paineiras Logística e Transportes Ltda. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Road freight transport
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| Portocel - Terminal Espec. Barra do Riacho S.A. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Port operations
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| Country |
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Brazil
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| % |
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51.00%
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51.00%
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| Projetos Especiais e Investimentos Ltda. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Commercialization of equipment and parts
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| SFBC Participações Ltda. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Packaging production
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| Suzano Argentina S.A.U (Direct) | ARGENTINA |
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| Company's Operations [Line Items] |
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| Main activity |
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Commercialization of paper and computer materials
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| Country |
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Argentina
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| % |
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100.00%
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100.00%
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| Suzano Austria GmbH. (Direct) | AUSTRIA |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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Austria
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| % |
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100.00%
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100.00%
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| Suzano Canada Inc. (Direct) | CANADA |
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| Company's Operations [Line Items] |
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| Main activity |
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Lignin research and development
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| Country |
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Canada
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| % |
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100.00%
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100.00%
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| Suzano Ecuador S.A.S. (Direct) | ECUADOR |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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Ecuador
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| % |
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100.00%
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100.00%
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| Suzano International Finance B.V (Direct) | NETHERLANDS |
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| Company's Operations [Line Items] |
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| Main activity |
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Financial fundraising
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| Country |
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Netherlands
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| % |
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100.00%
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100.00%
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| Suzano International Holding B.V. (Direct) | NETHERLANDS |
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| Company's Operations [Line Items] |
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| Main activity |
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Holding
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| Country |
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Netherlands
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| % |
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100.00%
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100.00%
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| Suzano International Trade GmbH. (Direct) | AUSTRIA |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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Austria
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| % |
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100.00%
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100.00%
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| Suzano Packaging LLC (Indirect) | UNITED STATES |
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| Company's Operations [Line Items] |
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| Main activity |
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Production of coated and uncoated paperboard, used in the production of Liquid Packaging Board and Cupstock
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| Country |
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United States of America
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| % |
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100.00%
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100.00%
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| Suzano Material Technology Development Ltd. (Direct) | CHINA |
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| Company's Operations [Line Items] |
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| Main activity |
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Biotechnology research and development
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| Country |
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China
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| % |
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100.00%
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100.00%
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| Suzano Netherlands B.V. (Direct) | NETHERLANDS |
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| Company's Operations [Line Items] |
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| Main activity |
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Financial fundraising
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| Country |
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Netherlands
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| % |
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100.00%
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100.00%
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| Suzano Operações Industriais e Florestais S.A. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Industrialization, commercialization and exporting of pulp
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| Country |
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Brazil
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| % |
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100.00%
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100.00%
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| Suzano Pulp and Paper America Inc. (Direct) | UNITED STATES |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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United States of America
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| % |
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100.00%
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100.00%
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| Suzano Pulp and Paper Europe S.A. (Direct) | SWITZERLAND |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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Switzerland
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| % |
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100.00%
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100.00%
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| Suzano Shanghai Ltda. (Direct) | CHINA |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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China
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| % |
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100.00%
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100.00%
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| Suzano Shanghai Trading Ltda. (Direct) | CHINA |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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China
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| % |
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100.00%
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100.00%
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| Suzano Singapura Pte. Ltda. (Direct) | SINGAPORE |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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Singapore
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| % |
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100.00%
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100.00%
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| Suzano Trading International KFT(Direct) | HUNGARY |
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| Company's Operations [Line Items] |
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| Main activity |
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Business office
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| Country |
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Hungary
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| % |
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100.00%
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100.00%
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| Suzano Ventures LLC (Direct) | UNITED STATES |
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| Company's Operations [Line Items] |
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| Main activity |
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Corporate venture capital
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| Country |
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United States of America
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| % |
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100.00%
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100.00%
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| Veracel Celulose S.A. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Industrialization, commercialization and exporting of pulp
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| Country |
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Brazil
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| Proportion Of Ownership Interest in Equity Securities, accounting method, Joint operation |
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50.00%
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50.00%
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| Allotrope Energy Ltd | England |
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| Company's Operations [Line Items] |
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| Main activity |
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Research and development of battery technology based on carbon derived from lignin biomass
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| Country |
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England
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| Proportion of ownership interest in associate |
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19.72%
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20.00%
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| Biomas Serviços Ambientais, Restauração e Carbono S.A. (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Restoration, conservation and preservation of forests
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| Country |
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Brazil
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| Proportion of ownership interest in associate |
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16.66%
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16.66%
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| Muçununga Serviços Ambientais, Restauração e Carbono Ltda. (Indirect) (1) | BRAZIL |
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| Company's Operations [Line Items] |
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| Proportion of ownership interest in associate |
50.00%
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8.33%
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8.33%
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100.00%
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| Ibema Companhia Brasileira de Papel (Direct) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
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Industrialization and commercialization of paperboard
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| Country |
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Brazil
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| Proportion of ownership interest in associate |
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49.90%
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49.90%
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| Simplifyber, Inc. (Indirect) | UNITED STATES |
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| Company's Operations [Line Items] |
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| Main activity |
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Production of consumer goods through the transformation of cellulose-based liquids
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| Country |
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United States of America
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| Proportion of ownership interest in associate |
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15.52%
|
14.20%
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| Spinnova Plc. (Direct) (“Spinnova”) | FINLAND |
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| Company's Operations [Line Items] |
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| Main activity |
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Research of sustainable raw materials for the textile industry
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| Country |
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Finland
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| Proportion of ownership interest in associate |
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18.76%
|
18.76%
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| Woodspin Oy (Direct/Indirect) (“Woodspin”) (3) | FINLAND |
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| Company's Operations [Line Items] |
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| Main activity |
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Development and production of cellulose-based fibers, yarns and textile filaments
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| Country |
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Finland
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| Proportion of ownership interest in associate |
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18.76%
|
18.76%
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| Spinnova Refining Oy (Indirect) (3) | FINLAND |
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| Company's Operations [Line Items] |
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| Main activity |
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Industrialization and commercialization of cellulose, microfiber cellulose and paper
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| Country |
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Finland
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| Proportion of ownership interest in associate |
|
18.76%
|
18.76%
|
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| Bem Agro Integração e Desenvolvimento S.A. (Indirect) | BRAZIL |
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| Company's Operations [Line Items] |
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| Main activity |
|
Software solutions based on artificial intelligence and computer vision for agribusiness
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| Country |
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Brazil
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| Proportion of ownership interest in associate |
|
4.58%
|
5.82%
|
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| Celluforce Inc. (Direct) | CANADA |
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| Company's Operations [Line Items] |
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| Main activity |
|
Nanocrystalline pulp research and development
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| Country |
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Canada
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| Proportion Of Ownership Interest in Equity Securities, accounting method, Joint operation |
|
8.28%
|
8.28%
|
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| Lenzing Aktiengesellschaft (Indirect) | AUSTRIA |
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| Company's Operations [Line Items] |
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| Main activity |
|
Production of wood-based cellulose fibers
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| Country |
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Austria
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|
|
|
| Proportion of ownership interest in associate |
|
15.00%
|
15.00%
|
|
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| Nfinite Nanotechnology Inc. (Indirect) | CANADA |
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| Company's Operations [Line Items] |
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| Main activity |
|
Research and development of smart nanocoatings
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|
|
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| Country |
|
Canada
|
|
|
|
| Proportion Of Ownership Interest in Equity Securities, accounting method, Joint operation |
|
5.40%
|
4.90%
|
|
|