Company: SUZ
Filing Date: 2025-09-02
Form Type: 6-K
Source: 0001104659-25-086003
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-16UNDER

THE SECURITIES EXCHANGE ACT OF 1934

For the month ofSeptember 2025.

Commission File Number001-38755

SuzanoS.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): ¨

<div align='center'>INCORPORATION BY REFERENCE</div>

This report and exhibits are incorporated by reference
in our registration statements on Form F-3 filed with the U.S. Securities and Exchange Commission on April 30, 2025 (File Nos. 333-286881,
333-286881-01 and 333-286881-02), and shall be deemed to be a part thereof from the date on which this report is furnished to the SEC,
to the extent not superseded by documents or reports subsequently filed or furnished.

<div align='center'>Table of Contents</div>

<div align='center'>2

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS</div>

The following discussion of the consolidated financial condition and operating results of Suzano S.A. (“ Suzano” or the “ Company”) should be read together with our unaudited condensedconsolidated interim financial information
for the six-month period ended June 30, 2025.

The following discussion contains forward-looking statements that involve risks and uncertainties. The actual results of Suzano may