6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of January, 2024.

Commission File Number 001-38755

Suzano S.A. (Exact name of registrant as specified in its charter)

SUZANO INC. (Translation of Registrant’s Name into English)

Av. Professor Magalhaes Neto, 1,752 10th Floor, Rooms 1010 and 1011 Salvador, Brazil 41 810-012 (Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F ☑    Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

Enclosures:

Exhibit 99.1 – Minutes of the Board of Directors' Meeting

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: January 3, 2024

Document

SUZANO S.A.

Publicly Held Company with Authorized Capital

Corporate Taxpayer ID (CNPJ/MF): 16.404.287/0001-55

Company Registration (NIRE): 29.300.016.331

MINUTES OF THE MEETING OF THE BOARD OF DIRECTORS

HELD ON DECEMBER 22, 2023

1.Date, Time and Place: The Board of Directors (“Board”) met on December 22, 2023, at 7 p.m., at the branch office of Suzano S.A. (“Company”) located at Avenida Brigadeiro Faria Lima, 1355, 8th floor, in the City of São Paulo, State of São Paulo.

2.Attendance: The following Directors attended the meeting: David Feffer (Chairman of the Board of Directors), Daniel Feffer (Vice-Chairman of the Board of Directors), Nildemar Secches (Vice-Chairman of the Board of Directors), Ana Paula Machado Pessoa (Director), Gabriela Feffer Moll (Director), Maria Priscila Rodini Vansetti Machado (Director), Paulo Rogerio Caffarelli (Director), Paulo Sergio Kakinoff (Director) and Rodrigo Calvo Galindo (Director). Also attended this meeting, as guests, Mr. Walter Schalka, Chief Executive Officer (CEO), Mr. Marcelo Feriozzi Bacci, Finance and Investor Relations Executive Officer, and Mr. Marcos Chagas Assumpção.

3.Chairman and Secretary: The meeting was chaired by Mr. David Feffer and Mr. Marcos Chagas Assumpção acted as secretary.

4.Agenda: To resolve on the acquisition of the totality of the capital shares held by Timber VII SPE S.A. (CNPJ 23.741.553/0001-09) and Timber XX SPE S.A. (CNPJ 40.157.006/0001-91), which own, through corporate entities by them controlled, approximately 70,000 hectares of land in the state of Mato Grosso do Sul, in Project Cerrado’s coverage region, being part of the referred area composed by eucalyptus plantation from different ages (“Transaction”).

5.Minutes in Summary Form: The Directors unanimously approved the drawing up of these minutes in summary form.

6.Resolutions:

6.1Approve the Transaction based on the following main conditions: (i) acquisition price of BRL 1,826,000,000.00 (one billion, eight hundred and twenty-six million Brazilian reais), to be paid in cash in 2024 on the Transaction closing date. If the closing occurs after March 31, 2024, the price shall be converted into US Dollar; (ii) the acquisition price may be adjusted to reflect the position of the sellers on the closing date, with regard to usual economical and operational aspects in this type of Transaction; and (iii) the Transaction is subject to the approval of the Brazilian antitrust authorities (CADE) and other usual conditions precedent for this type of transaction.

6.2Regarding the approval above, the members of the Board of Directors decide to authorize the Company’s Executive Board of Officers to perform any and all acts and sign any and all other documents necessary for the execution of the resolution approved herein.

7.Closing: There being no further business, the meeting was closed. The minutes of the meeting was drafted, read and approved by all the Directors present.

São Paulo, SP, December 22, 2023.

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