SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

February 2021

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 will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F x       Form 40-F o

Indicate by check mark if the registrant is submitting the Form 6-K on paper as permitted by Regulation S-T Rule 101(b)(1): o

Indicate by check mark if the registrant is submitting the Form 6-K on paper as permitted by Regulation S-T Rule 101(b)(7): o

EXHIBITS

2

SIGNATURES

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.

3

Exhibit 99.1

GDS to Report Fourth Quarter and Full Year 2020 Financial Results After the Close of the U.S. Market on March 10, 2021

SHANGHAI, China, February 26, 2021 (GLOBE NEWSWIRE) — GDS Holdings Limited (“GDS Holdings,” “GDS” or the “Company”) (NASDAQ: GDS; HKEX: 9698), a leading developer and operator of high-performance data centers in China, today announced that it will report its fourth quarter and full year 2020 unaudited financial results after the close of the U.S market on March 10, 2021 and before the opening of the Hong Kong market on March 11, 2021.

The Company’s management will host an earnings conference call at 7:00 PM U.S. Eastern Time on Wednesday, March 10, 2021 (8:00 AM  Hong Kong time on Thursday, March 11, 2021).

Dial-in details for the earnings conference call are as follows:

Participants should dial in at least 10 minutes before the scheduled start time and provide the Conference ID to the Operator to be connected to the conference. Due to conditions surrounding the outbreak of COVID-19, participants may experience longer than normal hold period before being assisted to join the call. The Company thanks everyone in advance for their patience and understanding.

Additionally, a live and archived webcast of the conference call will be available on the Company’s investor relations website at http://investors.gds-services.com.

A replay of the conference call will be accessible by phone approximately two hours after the conclusion of the live call at the following numbers, until March 18, 2021 08:59 AM U.S. ET:

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 located in China’s primary economic hubs where demand for high-performance data center services is concentrated. The Company also builds-to-suit and operates data centers at lower-tier locations selected by its customers in order to fulfill their broader requirements. The Company’s data centers have large net floor area, high power capacity, density and efficiency, and multiple redundancy across all critical systems. GDS is carrier and cloud-neutral, which enables its customers to access all the major PRC telecommunications networks, as well as the largest PRC and global public clouds which are hosted in many of its facilities. The Company offers colocation and managed services, including direct private connection to leading public clouds, an innovative service platform for managing hybrid clouds and, where required, the resale of public cloud services. The Company has a 20-year track record of service delivery, successfully fulfilling the requirements of some of the largest and most demanding customers for outsourced data center services in China. The Company’s customer base consists predominantly of hyperscale cloud service providers, large internet companies, financial institutions, telecommunications carriers, IT service providers, and large domestic private sector and multinational corporations.

For investor and media inquiries, please contact:

GDS Holdings Limited

Laura Chen

Phone: +86 (21) 5176-5509

Email: ir@gds-services.com

The Piacente Group, Inc.

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

Exhibit 99.2

Hong Kong Exchanges and Clearing Limited, The Stock Exchange of Hong Kong Limited (the “Hong Kong Stock Exchange”) and Hong Kong Securities Clearing Company Limited take no responsibility for the contents of this announcement, make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.

GDS Holdings Limited** (the “Company”) is controlled through weighted voting rights. Shareholders and prospective investors should be aware of the potential risks of investing in a company with a weighted voting right, or WVR, structure. Particularly, the WVR beneficiary, whose interests may not necessarily be aligned with those of our shareholders as a whole, will be in a position to exert significant influence over the outcome of shareholders’ resolutions, irrespective of how other shareholders vote. Our American depositary shares, each representing eight of our Class A ordinary shares, are listed on the Nasdaq Global Market in the United States under the symbol GDS.

GDS Holdings Limited

萬國數據控股有限公司*

(A company controlled through weighted voting rights and incorporated in the Cayman Islands with limited liability under the name GDS Holdings Limited and carrying on business in Hong Kong as GDS WanGuo Holdings Limited)

(Stock Code: 9698)

DATE OF BOARD MEETING

Our board of directors will hold a board meeting on March 10, 2021 (Hong Kong time) for the purposes of, among others, approving our unaudited financial results for the fourth quarter and full year ended December 31, 2020 (“Results”).  We will announce our Results on March 11, 2021 (Hong Kong time), after the trading hours of the U.S. market on March 10, 2021 and before the opening of the Hong Kong market, on the website of the Hong Kong Stock Exchange at www.hkexnews.hk.

The earnings teleconference call will take place at 8:00 AM on March 11, 2021 (Hong Kong time). Our management will be on the call to discuss the Results. Interested parties may participate in the conference call by dialing +852-3018-6771 or +65-6713-5090 and providing conference ID: 6199036, 15 minutes prior to the initiation of the call.

Hong Kong, February 26, 2021

As at the date of this announcement, the board of directors of the Company comprises Mr. William Wei Huang as the chairman, Mr. Sio Tat Hiang as the vice-chairman, Mr. Satoshi Okada, Mr. Bruno Lopez, Mr. Lee Choong Kwong, and Mr. Gary J. Wojtaszek as directors, and Mr. Lim Ah Doo, Ms. Bin Yu, Mr. Zulkifli Baharudin, Mr. Chang Sun and Ms. Judy Qing Ye as independent directors.

*                 For identification purposes only

**          Incorporated in the Cayman Islands with limited liability under the name GDS Holdings Limited and carrying on business in Hong Kong as GDS WanGuo Holdings Limited