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 April 2024

Commission File Number: 001-34563

CONCORD MEDICAL SERVICES HOLDINGS LIMITED

Room A1-A5 26/F, East Zone, Hanwei Plaza

No. 7 Guanghua Road, Chaoyang District,

Beijing 100020

People’s Republic of China

(Address of 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        x                 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): ¨

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): ¨

Concord Healthcare Announces Proposed Implementation of the H Share Full Circulation on The Stock Exchange of Hong Kong Limited

Concord Healthcare Group Co., Ltd. (“Concord Healthcare”), a subsidiary of Concord Medical Services Holdings Limited (the “Company”) (NYSE: CCM), which subsidiary is listed on the Main Board of The Stock Exchange of Hong Kong Limited (the “HKSE”) under the stock code 2453.HK, announced proposed implementation of the H share full circulation on April 30, 2024. Pursuant to the relevant guidelines, Concord Healthcare has submitted an application to the China Securities Regulatory Commission in respect of the conversion of certain outstanding domestic shares (the “Domestic Shares”) into its H shares that are listed on the HKSE. Upon obtaining all the relevant approvals and having complied with all the applicable laws, regulations and rules, the Domestic Shares will be converted into H shares, and Concord Healthcare will apply for the listing of and permission to deal in such H shares on the HKSE.

The Company previously announced the listing of Concord Healthcare’s H shares on the HKSE on January 9, 2024. The information related to Concord Healthcare’s Transactions on the HKSE is accessible through the HKSE’s website at www.hkexnews.hk.

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.

Date: April 30, 2024