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 May 2026

Commission File Number: 001-39127

Canaan Inc.

28 Ayer Rajah Crescent

#06-08

Singapore 139959

(Address of 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 x Form 40-F ¨

On May 19, 2026, Canaan Inc. (the “Company”) issued a press release announcing the Company’s financial results and business updates for the first quarter ended March 31, 2026.

Exhibit 99.1 to this Form 6-K (excluding the statements set forth under the section headed “Business Outlook” contained in Exhibit 99.1) is hereby incorporated by reference into the Company’s Registration Statement on Form F-3 (File No. 333-285125).

EXHIBITS

Exhibit No.	Description
Exhibit 99.1	Canaan Inc. Reports Unaudited First Quarter 2026 Financial Results

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.

	Canaan Inc.

	By:	/s/ Nangeng Zhang
	Name:	Nangeng Zhang
	Title:	Chairman and Chief Executive Officer

Date: May 19, 2026

Canaan Inc. 6-K