Company: SUZ
Filing Date: 2025-09-09
Form Type: 6-K
Source: 0001104659-25-088381
Chunk: 0

Company: Suzano S.A.
Filing Date: 2025-09-09
Form: 6-K
Chunk 0
---
<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 expiration and final results

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 expiration and final results of the offers to purchase for cash any and all of
the outstanding notes of their respective series: (1) 5.750% Guaranteed Notes due 2026 (the “2026 Notes”) issued
by Suzano Austria and guaranteed by Suzano (CUSIP: 05674XAA9 / A9890AAA8 / ISIN: US05674XAA90 / USA9890AAA81) (the “2026 Notes Offer”), and (2) 5.500% Guaranteed Notes due 2027 (the “2027 Notes” and, together with the 2026
Notes, the “Notes” and, each, a “series of Notes