6-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OFFOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of June 2020

Commission File Number: 001-36427

CHEETAH MOBILE INC.

BuildingNo. 8

Hui Tong Times Square

Yaojiayuan South Road

Beijing 100123

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  ☒            Form 40-F  ☐

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):  ☐

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):  ☐

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.

Date: June 29, 2020

Exhibit Index

EX-99.1

Exhibit 99.1

Cheetah Mobile to Hold Annual General Meeting

Beijing, June 29, 2020 — Cheetah Mobile Inc. (NYSE: CMCM) (“Cheetah Mobile” or the “Company”), a leading mobile internet company with global market coverage, today announced that it will hold its annual general meeting of shareholders at the offices of Cheetah Mobile at Building No. 8, Hui Tong Times Square, Yaojiayuan South Road, Beijing, China, on July 13, 2020 at 2:00 p.m. (local time).

No proposal will be submitted for shareholder approval at the annual general meeting. Instead, the annual general meeting will serve as an open forum for shareholders of record to discuss Company affairs with management.

The Board of Directors of the Company has fixed the close of business on July 10, 2020 as the record date (the “Record Date”) for determining the shareholders entitled to receive notice of the annual general meeting or any adjournment or postponement thereof.

Holders of record of the Company’s Class A and Class B ordinary shares at the close of business on the Record Date are entitled to attend the annual general meeting and any adjournment or postponement thereof in person.

About Cheetah Mobile Inc.

Cheetah Mobile is a leading mobile Internet company with global market coverage. It has attracted hundreds of millions of monthly active users through its mobile utility products such as Clean Master, casual games such as Piano Tiles 2, and Bricks n Balls. The Company provides its advertising customers, which include direct advertisers and mobile advertising networks through which advertisers place their advertisements, with direct access to highly targeted mobile users and global promotional channels. The Company also provides value-added services to its mobile application users through the sale of in-app virtual items on selected mobile products and games. Cheetah Mobile is committed to leveraging its cutting-edge artificial intelligence technologies to power its products and make the world smarter. It has been listed on the New York Stock Exchange since May 2014.

Investor Relations Contact

Cheetah Mobile Inc.

Helen Jing Zhu

Tel: +86 10 6292 7779 ext. 1600

Email: IR@cmcm.com

ICR Inc.

Xinran Rao

Tel: +1 (646) 417-5395

Email: IR@cmcm.com

1

EX-99.2

Exhibit 99.2

Cheetah Mobile Inc.

(incorporated in the Cayman Islands with limited liability)

(NYSE Ticker: CMCM)

NOTICE OF ANNUAL GENERAL MEETING

To be held on July 13, 2020

(or any adjourned or postponed meeting thereof)

NOTICE IS HEREBY GIVEN that an annual general meeting (the “AGM”) of Cheetah Mobile Inc. (the “Company”) will be held at the offices of the Company at Building No. 8, Hui Tong Times Square, Yaojiayuan South Road, Beijing, China on July 13, 2020 at 2:00 p.m. (local time). No proposal will be submitted for shareholder approval at the AGM. Instead, the AGM will serve as an open forum for shareholders of record to discuss Company affairs with management.

The Board of Directors of the Company has fixed the close of business on July 10, 2020 as the record date (the “RecordDate”) for determining the shareholders entitled to receive notice of the AGM or any adjournment or postponement thereof.

Holders of record of the Company’s Class A and Class B ordinary shares at the close of business on the Record Date are entitled to attend the AGM and any adjournment or postponement thereof in person.

Beijing, June 29, 2020