GDS : DATE OF BOARD MEETING

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 May 19, 2021 (Hong Kong time) for the purposes of, among others, approving our unaudited financial results for the first quarter ended March 31, 2021 ("Results"). We will announce our Results on May 20, 2021 (Hong Kong time), after the trading hours of the U.S. market on May 19, 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 May 20, 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 [phone] or [phone] and providing conference ID: 9394138, 15 minutes prior to the initiation of the call.

By order of the Board

GDS Holdings Limited **

Mr. William Wei Huang

Chairman and Chief Executive Officer

Hong Kong, May 6, 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