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

VINFASTREPORTS DELIVERIES OF 24,774 ELECTRIC VEHICLES IN APRIL 2026 IN VIETNAM

Hanoi,May 12, 2026 – VinFast Auto Ltd. (“VinFast” or the “Company”) announced preliminary domestic Vietnam deliveriesof 24,774 electric vehicles (“EVs”) for April 2026. Year to date, the Company has delivered a preliminary total of 78,458EVs to customers in Vietnam, reaffirm its leadership in the domestic automotive market.

Notably, Limo Green continued to be VinFast’s best-selling model in April, with 6,480 vehicles being delivered during the month. The VF 3 ranked second, with 5,273 vehicles delivered. The VF 5 and the Herio Green, which is derived the VF 5, recorded a total of 4,732 vehicles delivered, followed by the VF 6, with 2,704 vehicles delivered. The VF MPV 7 recorded 2,526 vehicles delivered, while the VF 7 recorded 1,148 vehicles delivered.

For the first four months of 2026, the Limo Green and the VF 3 were VinFast’s two best-selling models in Vietnam with cumulative deliveries of 18,951 and 15,461 vehicles, respectively. The Company also delivered 13,404 VF 5 and Herio Green vehicles, 9,383 VF 6 vehicles, 6,212 VF MPV 7 vehicles and 4,662 VF 7 vehicles during the period.

This Form 6-K shall be deemed to be incorporated by reference into the Company’s registration statement on Form S-8 (File No. 333-278251), registration statement on Form F-3 (File No. 333-275133), and registration statement on Form F-3 (File No. 333-291445) (including any prospectuses forming a part of such registration statements) and to be a part thereof from the date on which this report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished.

Notes:

Preliminarydelivery results are subject to change and may differ from the final number of deliveries that will be recognized as vehicle sales revenuefor the period as a result of the year end audit.

Marketand industry statements in this document are based on data from the Vietnam Automobile Manufacturers’ Association and Company internaldata (for VinFast only).

AboutVinFast

VinFast(NASDAQ: VFS) – a subsidiary of Vingroup JSC – is Vietnam’s leading automotive manufacturer, committed to its missionof creating a green future for everyone. VinFast produces a range of electric SUVs, e-scooters, e-bikes, and e-buses in Vietnam and exportsto key markets across Asia, North America, and Europe. Learn more at www.vinfastauto.us.

VinFast deliveries represent only one measure of the Company’s financial performance and should not be relied on as an indicator of quarterly financial results, which depend on a variety of factors, including the average selling price and various cost components.

1

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.

2