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

January 2026

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 ¨

4Q25 performance report dates Rio de Janeiro, January 12, 2026 - Vale SA (B3: VALE3 and NYSE: VALE) informs its investors the release of its 4Q25 earnings on the following dates. 4Q25 production and sales report: Date: January 27, 2026 (Tuesday) Time: After market close 4Q25 financial performance report: Date: February 12, 2026 (Thursday) Time: After market close Conference call/webcast: Date: February 13, 2026 (Friday) Time: 11h00/10h00/14h00 (Brasília/New York/London time) Vale will broadcast its webcast live in English with simultaneous translation into Portuguese. Connection details will be available closer to the date on our website: www.vale.com/investors. For further information, please contact: Vale.RI@vale.com Thiago Lofiego: thiago.lofiego@vale.com Mariana Rocha: mariana.rocha@vale.com Luciana Oliveti: luciana.oliveti@vale.com Pedro Terra: pedro.terra@vale.com Patricia Tinoco: patricia.tinoco@vale.com 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. Press Release 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.

Signatures