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 July 2026

CommissionFile Number: 001-41658

LucasGC Limited

(Exactname of registrant as specified in its charter)

Room1109, 11/F, Tower A

StarPlaza, No. 8 Wangjing Street

ChaoyangDistrict

Beijing100102, China

(Addressof principal executive offices)

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 ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ☐

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ☐

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant’s “home country”), or under the rules of the home country exchange on which the registrant’s securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant’s security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR.

INCORPORATIONBY REFERENCE

This current report on Form 6-K (this “Report”) is hereby incorporated by reference in the registration statements of Lucas GC Limited on Form F-3 (No. 333-286651) and Form S-8 (No. 333-283728), to the extent not superseded by documents or reports subsequently filed or furnished.

CHANGE OF ROLEOF CHIEF TECHNOLOGY OFFICER

Effective July 30, 2026, Mr. Harry Tang will step down from his role as the chief technology officer of Lucas GC Limited (the “Company”) to become a senior advisor of the Company. Mr. Tang’s change of role was for personal reasons and was not the result of any disagreement with the Company on any matter relating to its operations, policies, or practices of the Company.

In his new role as a senior advisor, Mr. Tang will continue to support implementation and commercialization of the Company’s patent portfolio and technologies jointly developed by the Company’s founder, chief executive officer and chairman of the board of directors, Mr. Howard Lee, and the Company’s executive director Dr. Wang-chan Wong, across various industry applications and verticals.

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.