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 September 2023.

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 – Notice to the Market – Settlement of the 10th debentures issuance

2

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: September 18, 2023

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

3

EX-99.1

Exhibit 99.1

SUZANO S.A.

Publicly Held Company with Authorized Capital

CNPJ/ME No. 16.404.287/0001-55

NIRE 29.300.016.331

NOTICE TO THE MARKET

São Paulo, September 18, 2023 –SuzanoS.A.("Suzano"or"Company")(B3:SUZB3|NYSE:SUZ), in addition to the Notice to the Market released on September 5, 2023, informs its shareholders and the market in general that, in the present date, occurred the settlement of the 10^th (tenth) issuance of common debentures, non-convertible into shares, unsecured, in single series, which were object of a public offer, according to the automatic distribution registration procedure, under the terms of Law 6,385, of December 7, 1976, as amended, CVM Resolution No. 160, of July 13^th, 2022, as amended, and other applicable legal and regulatory provisions, with the following characteristics:

● Total Amount of the Issuance:BRL 2,000,000,000.00 (two billion Brazilian reais).

● Issuance Date:September 15, 2023.

● Term and Maturity Date: 15 (fifteen) years counted from the Issuance Date, maturing, therefore, on September 15, 2038.

● Remuneration of the Debentures: The Debentures will bear fixed-rate interest of 6.1889% p.a. on the Nominal Unit Value of the Debentures.

● Monetary Adjustment of the Debentures: The Unit Par Value of the Debentures will be restated by the accumulated variation of the IPCA.

● Debenture Characteristics: The Debentures will meet the requirements of article 2 of Law No. 12,431, of June 24, 2011, as amended, so that their holders may be entitled to tax benefits pursuant to the law.

SãoPaulo, September 18, 2023.

Marcelo Feriozzi Bacci

Chief Financial and Investor Relations Officer