SECURITIES AND EXCHANGE COMMISSION 

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant toRule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

August 2025

Commission File Number: 001-37925

GDS Holdings Limited 

(Registrant’s name)

F4/F5, Building C, Sunland International

No. 999 Zhouhai Road 

Pudong, Shanghai 200137

People’s Republic of China 

(Address of principal executive offices)

Indicate by check mark whether the registrant files or willfile annual reports under cover of Form 20-F or Form 40-F:

Form 20-Fx Form 40-F ¨

EXHIBITS

SIGNATURES

Pursuant to the requirements of theSecurities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto dulyauthorized.

Exhibit 99.1

GDS Announces Official Listing and Trading ofits C-REIT on the Shanghai Stock Exchange from 8 August, 2025

SHANGHAI, China, August 5, 2025 (GLOBE NEWSWIRE)-- GDS Holdings Limited (“GDS Holdings”, “GDS” or the “Company”) (NASDAQ: GDS; HKEX: 9698), a leadingdeveloper and operator of high-performance data centers in China, today announced that its previously announced China REIT (“C-REIT”)will be officially listed and start trading on the Shanghai Stock Exchange from 8 August, 2025, under the fund code 508060.

About GDS Holdings Limited

GDS Holdings Limited (NASDAQ: GDS; HKEX: 9698)is a leading developer and operator of high-performance data centers in China. The Company’s facilities are strategically locatedin and around primary economic hubs where demand for high-performance data center services is concentrated. The Company’s data centershave large net floor area, high power capacity, density and efficiency, and multiple redundancies across all critical systems. GDS iscarrier and cloud-neutral, which enables its customers to access the major telecommunications networks, as well as the largest PRC andglobal public clouds, which are hosted in many of its facilities. The Company offers co-location and a suite of value-added services,including managed hybrid cloud services through direct private connection to leading public clouds, managed network services, and, whererequired, the resale of public cloud services. The Company has a 24-year track record of service delivery, successfully fulfilling therequirements of some of the largest and most demanding customers for outsourced data center services in China. The Company’s customerbase consists predominantly of hyperscale cloud service providers, large internet companies, financial institutions, telecommunicationscarriers, IT service providers, and large domestic private sector and multinational corporations. The Company also holds a non-controlling35.6% equity interest in DayOne Data Centers Limited which develops and operates data centers in International markets.

For investor and media inquiries, please contact:

GDS Holdings Limited

Laura Chen

Phone: +86 (21) 2029-2203

Email: ir@gds-services.com

Piacente Financial Communications

Ross Warner

Phone: +86 (10) 6508-0677

Email: GDS@tpg-ir.com

Brandi Piacente

Phone: +1 (212) 481-2050

Email: GDS@tpg-ir.com

GDS Holdings Limited