6-K

UNITEDSTATES

SECURITIESAND EXCHANGE COMMISSION

WASHINGTON,DC 20549

FORM 6-K

REPORTOF FOREIGN PRIVATE ISSUER

PURSUANTTO RULE 13a-16 OR 15d-16

OFTHE SECURITIES EXCHANGE ACT OF 1934

Forthe month of May 2026

CommissionFile Number: 001-41782

VinFastAuto Ltd.

DinhVu – Cat Hai Economic Zone

CatHai Island, Cat Hai Special Zone

HaiPhong City, Vietnam

(Addressof 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  ☒   Form 40-F  ☐

INFORMATIONCONTAINED IN THIS REPORT ON FORM 6-K

VinFast Auto Ltd. (the “Company”) held its extraordinary general meeting of shareholders on May 27, 2026 (the “Extraordinary General Meeting”). As of May 1, 2026, the Company’s record date, there were a total of 2,339,536,010 ordinary shares outstanding and entitled to vote at the Extraordinary General Meeting. At the Extraordinary General Meeting, holders of 2,291,900,385 shares issued and outstanding and entitled to vote at the Extraordinary General Meeting were represented in person or by proxy and, therefore, a quorum was present in accordance with the Company’s Constitution. A brief description of each matter voted upon at the Extraordinary General Meeting and the number of votes cast for, withheld, or against, and the number of abstentions with respect to each matter, as applicable, is attached as Exhibit 99.1.

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EXHIBIT INDEX

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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Exhibit 99.1

The following is a brief description of each matter voted upon at the Extraordinary General Meeting and the number of votes cast for, withheld, or against, and the number of abstentions with respect to each matter, as applicable.