6-K

UNITED STATES

SECURITIES AND EXCHANGECOMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER

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

THE SECURITIES EXCHANGEACT OF 1934

For the month ofJune 2025

Commission file number:001-39278

KingsoftCloud Holdings Limited

(Exact Name of Registrantas Specified in Its Charter)

Building D, Xiaomi Scienceand Technology Park, No. 33 Xierqi Middle Road,

Haidian District

Beijing, 100085, thePeople’s Republic of China

(Address of PrincipalExecutive 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  x              Form 40-F  ¨

EXHIBIT INDEX

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 99.1

Hong Kong Exchanges and Clearing Limited andThe Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement, make no representation as to itsaccuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the wholeor any part of the contents of this announcement.

This announcement is for information purposeonly and does not constitute an invitation or offer to acquire, purchase or subscribe for any securities of the Company.

Kingsoft Cloud HoldingsLimited

金山云控股有限公司

(Incorporated in theCayman Islands with limited liability)

(Stock Code: 03896)

(Nasdaq Stock Ticker: KC)

COMPLETION OF CONNECTED TRANSACTION INVOLVING SUBSCRIPTIONOF NEW SHARES UNDER SPECIFIC MANDATE

Reference is made to the announcement of the Company dated April 17, 2025, the circular of the Company dated May 9, 2025 (the “Circular”) and the poll results announcement of the Company dated June 9, 2025 in relation to, among other things, the connected transaction involving the Subscription of new Shares under specific mandate. Unless otherwise defined herein, capitalized terms used in this announcement shall have the same meanings as those defined in the Circular.

COMPLETION OF CONNECTED TRANSACTION INVOLVINGSUBSCRIPTION OF NEW SHARES UNDER SPECIFIC MANDATE

The Board is pleased to announce that the conditions of the Subscription have been fulfilled and completion of the Subscription took place on June 17, 2025. Pursuant to the Subscription Agreement, a total of 69,375,000 Subscription Shares has been allotted and issued to the Subscriber, Kingsoft Corporation, at the Subscription Price of HK$5.83 per Subscription Share. The Subscription Shares represent (i) approximately 1.68% of the total number of issued shares of the Company immediately before completion of the Subscription; and (ii) approximately 1.65% of the total number of issued shares of the Company as enlarged by the Subscription.

The Subscription Price per Subscription Share is HK$5.83, which is equivalent to the net Subscription Price per Subscription Share, as there are no underwriters’ discounts with respect to the Subscription.

The gross proceeds, which is also the net proceeds of issuing the Subscription Shares is expected to be HK$404,456,250 (equivalent to approximately US$52,138,120), which will be used for (i) investments in upgrading and expanding infrastructure, (ii) investments in technology and product development, and (iii) general corporate and working capital purposes.

1

EFFECT ON THE SHAREHOLDING STRUCTURE OF THE COMPANY

The table below sets out the shareholding structure of the Company immediately before and upon completion of the Subscription:

Notes:

Hong Kong, June 17, 2025

As at the date of this announcement, the boardof Directors comprises Mr. Lei Jun as Chairman and non-executive Director, Mr. Zou Tao as Vice Chairman and executive Director,Mr. He Haijian as executive Director and Mr. Zhang Duo as non-executive Director, and Mr. Yu Mingto, Mr. Wang Hangand Ms. Qu Jingyuan as independent non-executive Directors.

2

Exhibit 99.2