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UNITED\nSTATES

SECURITIES\nAND EXCHANGE COMMISSION

Washington,\nD.C. 20549

Form\n6-K

REPORT\nOF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER\nTHE SECURITIES EXCHANGE ACT OF 1934

For\nthe month of October 2026

Commission\nFile Number 001-42767

J-Star\nHolding Co., Ltd.

(Translation\nof registrant’s name into English)

3rd\nFloor, No. 107, Wuquan West 3rd Street,

West\nDistrict, Taichung City 403025,

Taiwan\n(R.O.C.)

(Address\nof principal executive office)

Indicate\nby check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form\n20-F ☒ Form 40-F

INFORMATION\nCONTAINED IN THIS FORM 6-K REPORT

J-Star\nHolding Co., Ltd. furnishes under the cover of Form 6-K the following in connection with the class meeting of holders of its Class A\nordinary shares (the “Class Meeting”) and extraordinary general meeting of shareholders (the “Extraordinary\nGeneral Meeting”), to be held on October 29, 2026.

Exhibits

\n \n \n \n \n \n \n \n \n \n \n \n \n

Exhibit\n No.		Description
99.1		Notices\n of the Class Meeting and the Extraordinary General Meeting of J-Star Holding Co., Ltd., to be held on October 29, 2026
99.2		Forms of Proxy Card for the Class Meeting and General Meeting

SIGNATURES

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

\n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n \n

Date: October 9, 2026	J-Star Holding Co., Ltd.

	By:	/s/ Jing-Bin\n Chiang
	Name:	Jing-Bin Chiang
	Title:	Chief Executive Officer

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