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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

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FORM 6-K/A

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REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

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For the month of September, 2023.

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Commission File Number 001-38755

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Suzano S.A.

(Exact name of registrant as specified in its charter)

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SUZANO INC.

(Translation of Registrant’s Name into English)

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Av. Professor Magalhaes Neto, 1,752

10th Floor, Rooms 1010 and 1011

Salvador, Brazil 41 810-012

(Address of principal executive office)

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

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Form 20-F ☒ Form 40-F ☐

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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): ☐

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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): ☐

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EXPLANATORY NOTE

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Suzano is amending its report on Form 6-K furnished to the Securities and Exchange Commission on August 2, 2023 (File/FilmNumber: 001-38755 / 231136862) (the “Original 6-K”) solely for the purpose of replacing Exhibit 99.1, which contains our Unauditedcondensed consolidated interim financial information as of June 30, 2023, and adding Exhibit 101, which contains Interactive Data Filedisclosure in accordance with Rule 405 of Regulation S-T. Except as described above, this amendment does not amend any information setforth in the Original 6-K.

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This report and exhibits shall be deemed to be incorporated by reference in our registration statements on Form F-3 filed with the U.S. Securities and Exchange Commission on September 18, 2020 (File No. 333-248909), and shall be deemed to be a part thereof from the date onwhich this report is furnished to the SEC, to the extent not superseded by documents or reports subsequently filed or furnished.

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EXHIBIT INDEX

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Exhibit Number | ​
Exhibit 99.1 | Unaudited condensed consolidated interim financial information as of June 30, 2023.
101.INS | XBRL Instance Document
101.SCH | XBRL Taxonomy Extension Schema
101.CAL | XBRL Taxonomy Extension Schema Calculation Linkbase
101.DEF | XBRL Taxonomy Extension Schema Definition Linkbase
101.LAB | XBRL Taxonomy Extension Schema Label Linkbase
101.PRE | XBRL Taxonomy Extension Schema Presentation Linkbase

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SIGNATURE

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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.

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Date: September 26, 2023

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​ | ​ | SUZANO S.A.
​ | ​ | ​
​ | By: | /s/ Marcelo Feriozzi Bacci
​ | Name: | Marcelo Feriozzi Bacci
​ | Title: | Chief Financial and Investor Relations Officer

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