VNET Group, Inc. — Regulatory Filings 2021

Jan 20, 2021

6-K 1 a2242818z6-k.htm 6-K QuickLinks -- Click here to rapidly navigate through this document

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

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FORM 6-K

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REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of January 2021 Commission File Number: 001-35126

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21Vianet Group, Inc.

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Guanjie Building, Southeast 1st Floor 10# Jiuxianqiao East Road Chaoyang District Beijing 100016 The People's Republic of China (Address of principal executive office)

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Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

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Form 20-F ý Form 40-F o

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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): o

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): o

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EXPLANATORY NOTE

Exhibit 99.2, Exhibit 99.3 and Exhibit 99.4 to this Current Report on Form 6-K are hereby incorporated by reference into the Registration Statement on Form F-3 of 21Vianet Group, Inc. (File No. 333-240044) and shall form a part thereof from the date on which this Current Report is furnished, to the extent not superseded by documents or reports subsequently filed or furnished.

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EXHIBIT INDEX

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Exhibit No.	Description
99.1	Press Release—21Vianet Announces Proposed Offering of US$525 million Convertible Senior Notes
99.2	Management's Discussion and Analysis of Financial Condition and Results of Operations
	Exhibit 99.2 sets forth the "Management's Discussion and Analysis of Financial Condition and Results of Operations" section included in the Registrant's preliminary offering memorandum dated January 20, 2021
in connection with the proposed offering of convertible senior notes
99.3	Business
	Exhibit 99.3 sets forth the description of the Registrant's business included in the Registrant's preliminary offering memorandum dated January 20, 2021 in connection with the proposed offering of
convertible senior notes
99.4	Unaudited Interim Condensed Consolidated Financial Statements
	Exhibit 99.4 sets forth the unaudited interim condensed consolidated financial statements included in the Registrant's preliminary offering memorandum dated January 20, 2021 in connection with the proposed
offering of convertible senior notes

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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.

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/s/ SHARON XIAO LIU
Name:	Sharon Xiao Liu
Title:	Chief Financial Officer

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Date: January 20, 2021

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QuickLinks

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