FF301Page 1 of 10 v 1.1.1Monthly Return for Equity Issuer and Hong Kong Depositary Receipts listed under Chapter 19B of the Exchange Listing Rules on Movements in Securities For the month ended: 30 September 2025 Status: New SubmissionTo : Hong Kong Exchanges and Clearing LimitedName of Issuer: Kingsoft Cloud Holdings LimitedDate Submitted: 08 October 2025I. Movements in Authorised / Registered Share Capital1. Class of shares Ordinary shares Type of shares Not applicable Listed on the Exchange (Note 1) YesStock code (if listed) 03896 DescriptionNumber of authorised/registered shares Par value Authorised/registered share capitalBalance at close of preceding month 40,000,000,000 USD 0.001 USD 40,000,000Increase / decrease (-) USDBalance at close of the month 40,000,000,000 USD 0.001 USD 40,000,000Total authorised/registered share capital at the end of the month: USD 40,000,000

FF301Page 2 of 10 v 1.1.1II. Movements in Issued Shares and/or Treasury Shares1. Class of shares Ordinary shares Type of shares Not applicable Listed on the Exchange (Note 1) YesStock code (if listed) 03896 DescriptionNumber of issued shares (excluding treasury shares) Number of treasury shares Total number of issued sharesBalance at close of preceding month 4,193,784,801 0 4,193,784,801Increase / decrease (-)Balance at close of the month 4,193,784,801 0 4,193,784,801

FF301Page 3 of 10 v 1.1.1III. Details of Movements in Issued Shares and/or Treasury Shares(A). Share Options (under Share Option Schemes of the Issuer)1. Class of shares Ordinary shares Type of shares Not applicable Listed on the Exchange (Note 1) YesStock code (if listed) 03896 DescriptionParticulars of share option schemeNumber of share options outstanding at close of preceding monthMovement during the monthNumber of share options outstanding at close of the monthNumber of new shares issued during the month pursuant thereto (A1)Number of treasury shares transferred out of treasury during the month pursuant thereto (A2)Number of shares which may be issued or transferred out of treasury pursuant thereto as at close of the monthThe total number of shares which may be issued or transferred out of treasury upon exercise of all share options to be granted under the scheme at close of the month1). 2013 Share Option Scheme 15,162,511 Others -513,795 14,648,716 14,009,229General Meeting approval date (if applicable) 27 February 2013Increase in issued shares (excluding treasury shares): Ordinary shares (AA1)Decrease in treasury shares: Ordinary shares (AA2)Total funds raised during the month from exercise of options: USD 38,133.98Remarks:No further grant of any share options under the 2013 Share Option Scheme will be made after December 30, 2022 (the date on which the Shares were listed and on which dealings in the Shares were to be first permitted to take place on the Hong Kong Stock Exchange).

FF301Page 4 of 10 v 1.1.1(B). Warrants to Issue Shares of the Issuer Not applicable

FF301Page 5 of 10 v 1.1.1(C). Convertibles (i.e. Convertible into Shares of the Issuer) Not applicable

FF301Page 6 of 10 v 1.1.1(D). Any other Agreements or Arrangements to Issue Shares of the Issuer, including Options (other than Share Option Schemes)1. Class of shares Ordinary shares Type of shares Not applicable Listed on the Exchange (Note 1) YesStock code (if listed) 03896 DescriptionDescription of other agreements or arrangementsGeneral Meeting approval date (if applicable)Number of new shares issued during the month pursuant thereto (D1)Number of treasury shares transferred out of treasury during the month pursuant thereto (D2)Number of shares which may be issued or transferred out of treasury pursuant thereto as at close of the month1). 2013 Share Award Scheme 22 February 2013 0 11,761,4832). 2021 Share Incentive Plan 15 November 2021 0 196,226,484Increase in issued shares (excluding treasury shares): 0 Ordinary shares (DD1)Decrease in treasury shares: Ordinary shares (DD2)Remarks:No further grant of any share awards under the 2013 Share Award Scheme will be made after December 30, 2022 (the date on which the Shares were listed and on which dealings in the Shares were to be first permitted to take place on the Hong Kong Stock Exchange).

FF301Page 7 of 10 v 1.1.1(E). Other Movements in Issued Shares and/or Treasury Shares Not applicableTotal increase/ decrease (-) in issued shares (excluding treasury shares) during the month (i.e. Total of AA1 to EE1): 0 Ordinary sharesTotal increase/ decrease (-) in treasury shares during the month (i.e. Total of AA2 to EE2): Ordinary shares

FF301Page 8 of 10 v 1.1.1IV. Information about Hong Kong Depositary Receipt (HDR) Not applicable

FF301Page 9 of 10 v 1.1.1V. ConfirmationsPursuant to Main Board Rule 13.25C / GEM Rule 17.27C, we hereby confirm to the best knowledge, information and belief that, in relation to each of the securities issued, or the treasury shares sold or transferred by the issuer during the month as set out in Parts III and IV which has not been previously disclosed in a return published under Main Board Rule 13.25A / GEM Rule 17.27A, it has been duly authorised by the board of directors of the listed issuer and carried out in compliance with all applicable listing rules, laws and other regulatory requirements and, insofar as applicable: (Note 4) (i) all money due to the listed issuer in respect of the issue of securities, or sale or transfer of treasury shares has been received by it; (ii) all pre-conditions for listing imposed by the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited under "Qualifications of listing" have been fulfilled; (iii) all (if any) conditions contained in the formal letter granting listing of and permission to deal in the securities have been fulfilled; (iv) all the securities of each class are in all respects identical (Note 5); (v) all documents required by the Companies (Winding Up and Miscellaneous Provisions) Ordinance to be filed with the Registrar of Companies have been duly filed and that compliance has been made with all other legal requirements; (vi) all the definitive documents of title have been delivered/are ready to be delivered/are being prepared and will be delivered in accordance with the terms of issue, sale or transfer; (vii) completion has taken place of the purchase by the issuer of all property shown in the listing document to have been purchased or agreed to be purchased by it and the purchase consideration for all such property has been duly satisfied; and (viii) the trust deed/deed poll relating to the debenture, loan stock, notes or bonds has been completed and executed, and particulars thereof, if so required by law, have been filed with the Registrar of Companies.Submitted by: Zou TaoTitle: Executive Director, Vice Chairman of the Board and acting Chief Executive Officer(Director, Secretary or other Duly Authorised Officer)

FF301Page 10 of 10 v 1.1.1Notes1. The Exchange refers to The Stock Exchange of Hong Kong Limited.2. In the case of repurchase of shares (shares repurchased and cancelled) and redemption of shares (shares redeemed and cancelled), "date of event" should be construed as "cancellation date".In the case of repurchase of shares (shares held as treasury shares), "date of event" should be construed as "date on which shares were repurchased and held by the issuer in treasury".3. The information is required in the case of repurchase of shares (shares repurchased for cancellation but not yet cancelled) and redemption of shares (shares redeemed but not yet cancelled). Please state the number of shares repurchased or redeemed during the month or in preceding month(s) but pending cancellation as at close of the month as a negative number.4. Items (i) to (viii) are suggested forms of confirmation. The listed issuer may amend the item(s) that is/are not applicable to meet individual cases. Where the issuer has already made the relevant confirmations in a return published under Main Board Rule 13.25A / GEM Rule 17.27A in relation to the securities issued, or the treasury shares sold or transferred, no further confirmation is required to be made in this return.5. “Identical” means in this context: ． the securities are of the same nominal value with the same amount called up or paid up; ． they are entitled to dividend/interest at the same rate and for the same period, so that at the next ensuing distribution, the dividend/interest payable per unit will amount to exactly the same sum (gross and net); and ． they carry the same rights as to unrestricted transfer, attendance and voting at meetings and rank pari passu in all other respects.