ONEG 6-K

UNITEDSTATES

SECURITIESAND EXCHANGE COMMISSION

Washington,D.C. 20549

FORM6-K

REPORTOF FOREIGN PRIVATE ISSUER

PURSUANTTO RULE 13a-16 OR 15d-16

UNDERTHE SECURITIES EXCHANGE ACT OF 1934

Forthe month of April 2026

CommissionFile Number: 001-42457

OneConstructionGroup Limited

Unit11, 5/F

Tower1, Harbour Centre

1Hok Cheung Street

Hunghum,Kowloon

HongKong

+8522123 8400

(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 ☐

On April 8, 2026, Mr. Cheung Kam Cheung, an executive director of OneConstruction Group Limited (the “Company”), notified the Company of his resignation as an executive director of the Board of Directors of the Company (“Board”), effective April 8, 2026. Mr. Cheung Kam Cheung’s resignation as an executive director of the Board was due to personal reasons, and was not a result of any disagreement with the Company or the Board.

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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.

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