Company: SUZ
Filing Date: 2025-09-08
Form Type: 6-K
Source: 0001104659-25-088231
Chunk: 0

Company: Suzano S.A.
Filing Date: 2025-09-08
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-Fx Form 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): ¨

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): ¨

| Press   
 Release |

<div align='center'>Suzano announces pricing

of cash tender offers</div>

São Paulo, September8, 2025 – Suzano International Finance B.V (“Suzano International Finance”) and Suzano
Austria GmbH (“Suzano Austria”), both wholly owned subsidiaries of Suzano S.A. (“Suzano”
or “Guarantor”), announce the determination of the Tender Consideration (as defined below) to purchase for cash
any and all of the outstanding Notes (as defined below) validly tendered in the Offers, excluding any accrued and unpaid interest (the
“Accrued Interest”), of the outstanding Notes issued by Suzano International Finance and Suzano Austria as set
forth in the table below (the “Notes”), validly tendered and accepted for purchase. The Offers are being made
upon the terms and subject to the conditions set forth in the offer to purchase dated September 2, 2025 (the “Offer to Purchase”).

Suzano International Finance and Suzano Austria
are together referred to herein as the “Offerors,” “