SEC Form 6-K filed by VALE S.A.

United States

Securities and Exchange Commission

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16

of the

Securities Exchange Act of 1934

For the month of

October 2025

Vale S.A.

Praia de Botafogo nº 186, 18º andar, Botafogo
22250-145 Rio de Janeiro, RJ, Brazil

(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.)

(Check One) Form 20-F x Form 40-F ¨

Vale pays interest on 10th issue incentive debentures Rio de Janeiro, October 14, 2025 – Vale S.A. informs that it will pay the interest remuneration of simple, non-convertible debentures, unsecured, of the 10th issue, series 1, 2 and 3 ("incentive debentures") on October 15th, 2025, in the total amount of R$ 199,838,323.19, to holders with positions in custody at B3 S.A. - Brasil, Bolsa, Balcão ('B3') and/or at Banco Itaú Unibanco S.A., the registrar and clearing bank for the incentive debentures, in the closing of October 14th, 2025. Below are the details of the remunerations for the period by series and by debenture: Serie Quantity Type of payment Unit value per debenture (R$) Total amount to be paid (R$) 1st 3,000,000 Remuneratory interest 33.18735618 99,562,068.54 2nd 1,800,000 Remuneratory interest 33.45920435 60,226,567.83 3rd 1,200,000 Remuneratory interest 33.37473902 40,049,686.82 Total 6,000,000 199,838,323.19 Marcelo Feriozzi Bacci Executive Vice President, Finance and Investor Relations For further information, please contact: [email protected] Thiago Lofiego: [email protected] Mariana Rocha: [email protected] Luciana Oliveti: [email protected] Pedro Terra: [email protected] Patricia Tinoco: [email protected] This press release may include statements that present Vale’s expectations about future events or results. All statements, when based upon expectations about the future, involve various risks and uncertainties. Vale cannot guarantee that such statements will prove correct. These risks and uncertainties include factors related to the following: (a) the countries where we operate, especially Brazil and Canada; (b) the global economy; (c) the capital markets; (d) the mining and metals prices and their dependence on global industrial production, which is cyclical by nature; and (e) global competition in the markets in which Vale operates. To obtain further information on factors that may lead to results different from those forecast by Vale, please consult the reports Vale files with the U.S. Securities and Exchange Commission (SEC), the Brazilian Comissão de Valores Mobiliários (CVM) and in particular the factors discussed under “Forward-Looking Statements” and “Risk Factors” in Vale’s annual report on Form 20-F. Notice to Debentureholders

Signatures

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.