Company: SUZ
Filing Date: 2025-09-02
Form Type: 6-K
Source: 0001104659-25-086076
Chunk: 0

Company: Suzano S.A.
Filing Date: 2025-09-02
Form: 6-K
Chunk 0
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<div align='center'>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, 2025.

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)</div>

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

<div align='center'>Form 20-F xForm 40-F¨</div>

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):o

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):o

| Press   
 Release |

<div align='center'>Suzano announces cash tender offers
for notes due 2026 and 2027</div>

São Paulo, September 2, 2025 –
Suzano International Finance B.V. (“Suzano International Finance”) and Suzano Austria GmbH (“Suzano Austria”), each a wholly-owned subsidiary of Suzano S.A. (“Suzano”), announce the commencement
of offers to purchase for cash any and all of the outstanding notes of the following series: (1) 5.750% Guaranteed Notes due 2026
issued by Suzano Austria and guaranteed by Suzano (the “2026 Notes”) and (2) 5.500% Guaranteed Notes due
2027 issued by Suzano International Finance and guaranteed by Suzano the (“2027 Notes” and, together with the
2026 Notes, the “Notes”) (each, an “Offer” and, collectively, the “Offers”).

Suzano International Finance and Suzano Austria
are together referred to herein as the “Offerors,” “we” or “our.” The