UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF

THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2021

Commission file number: 001-39278

Kingsoft Cloud Holdings Limited

(Exact Name of Registrant as Specified in Its Charter)

Building E, Xiaomi Science and Technology Park, No. 33 Xierqi Middle Road,

Haidian District

Beijing, 100085, the 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 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):  ☐

INCORPORATION BY REFERENCE

Exhibit 5.1 to this report on Form 6-K is incorporated by reference into (i) the registration statement on Form F-3 (File No. 333-333-260181) of Kingsoft Cloud Holdings Limited (the “Company”) and (ii) the related prospectus supplement, dated October 12, 2021 relating to the resale of ordinary shares by the selling shareholders identified therein, which was filed with the U.S. Securities and Exchange Commission on October 12, 2021 pursuant to Rule 424(b)(7) under the Securities Act of 1933, as amended.

SIGNATURE

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.

EXHIBIT INDEX

Exhibit 5.1

Kingsoft Cloud Holdings Limited

Building E, Xiaomi Science and Technology Park

No. 33 Xierqi Middle Road,

Haidian District

Beijing, 100085, the People’s Republic of China

12 October 2021

Dear Sirs

Kingsoft Cloud Holdings Limited

We have acted as Cayman Islands legal advisers to Kingsoft Cloud Holdings Limited (the “Company”) in connection with the Company’s registration statement on Form F-3, including all amendments or supplements thereto (the “Registration Statement”), filed with the Securities and Exchange Commission under the U.S. Securities Act of 1933, as amended to date, and the related prospectus supplement filed pursuant to Rule 424(b) of the U.S. Securities Act of 1933, as amended (the “Prospectus Supplement”) relating to the offering by the Company of certain of the Company’s ordinary shares of par value US$0.001 each (the “Shares”), including Shares represented by American depositary shares (the “ADSs”), and relating to the 177,679,900 Shares registered and to be offered by the selling shareholders (the “Resale Shares”).

We are furnishing this opinion as Exhibits 5.1, 8.1 and 23.2 to the Prospectus Supplement.

For the purposes of this opinion, we have reviewed only originals, copies or final drafts of the following documents:

The following opinions are given only as to, and based on, circumstances and matters of fact existing and known to us on the date of this opinion letter. These opinions only relate to the laws of the Cayman Islands which are in force on the date of this opinion letter. In giving these opinions we have relied (without further verification) upon the completeness and accuracy, as of the date of this opinion letter, of the Director’s Certificate and the Certificate of Good Standing. We have also relied upon the following assumptions, which we have not independently verified:

Based upon the foregoing and subject to the qualifications set out below and having regard to such legal considerations as we deem relevant, we are of the opinion that:

In this opinion the phrase “non-assessable” means, with respect to the Shares in the Company, that a shareholder shall not, solely by virtue of its status as a shareholder, and in absence of a contractual arrangement, or an obligation pursuant to the memorandum and articles of association, to the contrary, be liable for additional assessments or calls on the Shares by the Company or its creditors (except in exceptional circumstances, such as involving fraud, the establishment of an agency relationship or an illegal or improper purpose or other circumstances in which a court may be prepared to pierce or lift the corporate veil).

Except as specifically stated herein, we make no comment with respect to any representations and warranties which may be made by or with respect to the Company in any of the documents or instruments cited in this opinion or otherwise with respect to the commercial terms of the transactions, which are the subject of this opinion.

2

We hereby consent to the filing of this opinion as an exhibit to the Prospectus Supplement and to the reference to our name under the headings “Enforceability of Civil Liabilities” and “Legal Matters” and elsewhere in the prospectus included in the Prospectus Supplement. In giving such consent, we do not thereby admit that we come within the category of persons whose consent is required under Section 7 of the U.S. Securities Act of 1933, as amended, or the Rules and Regulations of the Commission thereunder.

Yours faithfully

/s/ Maples and Calder (Hong Kong) LLP

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Director’s Certificate

12 October 2021

26th Floor, Central Plaza

18 Harbour Road

Wanchai, Hong Kong

Dear Sirs

Kingsoft Cloud Holdings Limited (the “Company”)

I, the undersigned, being a director of the Company, am aware that you are being asked to provide a legal opinion (the “Opinion”) in relation to certain aspects of Cayman Islands law. Capitalised terms used in this certificate have the meaning given to them in the Opinion. I hereby certify that:

Jun Lei

Tao Zou

Yulin Wang

Hangjun Ye

Kuiguang Niu

Hang Wang

Mingto Yu

I confirm that you may continue to rely on this Certificate as being true and correct on the day that you issue the Opinion unless I shall have previously notified you personally to the contrary.

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