UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 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 ~~August~~September 2025

Commission File Number: 001-38714

STONECO LTD. (Exact name of registrant as specified in its charter)

~~(Exact~~4th ~~name~~Floor, ofHarbour ~~registrant~~Place as103 ~~specified~~South inChurch ~~its~~Street, ~~charter~~P.O. Box 10240 Grand Cayman, KY1-1002, Cayman Islands +55 (11) 3004-9680 (Address of principal executive office)

4th Floor, Harbour Place

103 South Church Street, P.O. Box 10240

Grand Cayman, KY1-1002, Cayman Islands +55 (11) 3004-9680

(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 X ☑ 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): ☐

INCORPORATION BY REFERENCE

This report on Form 6-K shall be deemed to be incorporated by reference into the registration statement on Form S-8 (Registration Number: 333265382) of StoneCo Ltd. and to be a part thereof from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished.

EXHIBIT INDEX


Exhibit No.						Description
99.1						StoneCo Ltd. 3 Q25 Earnings Release

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.

StoneCo Ltd. By: /s/ ~~Tatiana~~Mateus ~~Malamud~~Scherer Schwening Name: ~~Tatiana~~Mateus ~~Malamud~~Scherer Schwening Title: Chief ~~Legal~~Financial Officer and ~~Compliance~~Investor Relations Officer

Date: ~~August~~November 76, 2025

EXHIBIT INDEX

Exhibit No.	Description
99.1	StoneCo Ltd. 2Q25 Earnings Release

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