21Vianet Group, Inc.

FY: Dec 31 2025

FY: Dec 31 2024

FY: Dec 31 2023

FY: Dec 31 2022

FY: Dec 31 2022

FY: Dec 31 2021

FY: Dec 31 2020

FY: Dec 31 2019

FY: Dec 31 2018

FY: Dec 31 2017

FY: Dec 31 2016

FY: Dec 31 2015

FY: Dec 31 2014

FY: Dec 31 2013

FY: Dec 31 2012

FY: Dec 31 2012

FY: Dec 31 2011

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Report of foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement with Pricing Information

No description available

Free Writing Prospectus

Registration statement for securities of certain foreign private issuers (amendment)

Notice of Effectiveness

Notice of Effectiveness

Registration statement for securities of certain foreign private issuers (amendment)

Registration of Securities on Exchange

Registration statement for securities of certain foreign private issuers (amendment)

Registration statement under the Securities Act of 1933 for depositary shares evidenced by American depositary receipts

Chen Sheng

PJ Millennium Limited Partnership

PJ Millennium Limited Partnership

Point72 Asset Management, L.P.

Chen David Lifeng

Shao Sean

ZHANG ZHIHUA

Shandong Hi-Speed Holdings Group Ltd

Chen Sheng

TAI KENNETH

Shao Sean

UENO Yoshihisa

Chen David Lifeng

Chen David Lifeng

Chen David Lifeng

Shao Sean

UENO Yoshihisa

Shao Sean

ZHANG ZHIHUA

WANG QIYU

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

No description available

No description available

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC