UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number: 001-41500

INTCHAINS GROUP LIMITED

(Exact name of registrant as specified in its charter)

c/o Building 16, Lane 999, Xinyuan South Road,

Lin-Gang Special Area,

Pudong, Shanghai, 201306

People’s Republic of China

+86 021 58961080

(Address of principal executive office)

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

INCORPORATION BY REFERENCE

This Report of Foreign Private Issuer on Form 6-K (this “Form 6-K”) filed by Intchains Group Limited (the “Company”) consists of the Company’s unaudited condensed consolidated financial statements for the six months ended June 30, 2026, which are attached hereto as Exhibit 99.1 and are incorporated by reference herein.

This Form 6-K, including its exhibit, is incorporated by reference into the Company’s registration statement on Form F-3 (File No. 333-279865) initially filed with the U.S. Securities and Exchange Commission (the “SEC”) on May 31, 2024, and declared effective by the SEC on August 5, 2024, and the Company’s registration statements on Form S-8 (File Nos. 333-278211 and 333-295137) filed with the SEC on March 25, 2024 and April 17, 2026, respectively.

EXHIBIT INDEX

SIGNATURE

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.