PAYMENT OF FINAL DIVIDEND FOR 2023

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement makes no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss however arising from or in reliance upon the whole or any part of the contents of this announcement.上海复旦微电子集团股份有限公司 Shanghai Fudan Microelectronics Group Company Limited* (a joint stock limited company incorporated in the People’s Republic of China) (Stock Code: 1385) PAYMENT OF FINAL DIVIDEND FOR 2023 References are made to the announcement of Shanghai Fudan Microelectronics Group Company Limited (the “Company”) dated 29 May 2024 in respect of among other things the payment of final dividend for 2023. Unless otherwise stated capitalised terms used herein shall have the same meanings as those defined in that announcement.PAYMENT OF FINAL DIVIDEND FOR 2023 The Board is pleased to announce that the resolution regarding the proposed final dividend of RMB 1 per 10 share (inclusive of tax) in respect of the year ended 31 December 2023 (the “FinalDividend”) was duly passed at the annual general meeting (the “AGM”) held on 28 May 2024.The exchange rate applied by the Company for the calculation of the amount of dividend for H shares in Hong Kong dollar is the average closing exchange rates of Hong Kong dollar to RMB during the 5 business days prior to the date of the AGM held on 28 May 2024 as announced by The People’s Bank of China which is HK$100 = RMB91.070. Based on such exchange rate the Final Dividend payable for each 10 H share is HK$1.09806 (inclusive of tax).Further explanation in respect of the payment of Final Dividend for 2023 to the shareholders of H Shares of the Company is set out below: TAXATION ARRANGEMENT 1. For shareholders of H Shares of the Company (excluding Mainland investors who hold H Shares of the Company via the Shanghai-Hong Kong Stock Connect Program or the Shenzhen-Hong Kong Stock Connect Program) (i) According to the Law on Corporation Income Tax of the People’s Republic of China (the “PRC”) and the relevant implementing rules the Company is required to withhold corporate income tax at the rate of 10% before distributing the Final Dividend to non-resident enterprise shareholders as appearing on the H share register of members of the Company (the “H Share Register”) on the Record Date. Any H shares registered in the name of non-individual shareholders including HKSCC Nominees limited other nominees trustees or other groups and organizations will be treated as being held by non-resident enterprise shareholders and therefore the Company will pay the Final Dividend after deducting the 10% withholding corporate income tax. 1(ii) Pursuant to the “Notice of the State Administration of Taxation on Matters Concerningthe Levy and Administration of Individual Income Tax after the Repeal of Guo Shui Fa[1993] No. 045 Document” (《国家税务总局关于国税发[1993]045号文件废止后有关个人所得税征管问题的通知》) promulgated by the State Administration of Taxation the dividend received by the overseas resident individual shareholders from the shares issued in Hong Kong by domestic non-foreign invested enterprises is subject to individual income tax which shall be withheld and paid by the withholding agents according to the relevant laws. However the overseas resident individual shareholders of the shares issued in Hong Kong by domestic non-foreign invested enterprises are entitled to the relevant preferential tax treatment pursuant to the provisions in the tax agreements signed between the countries where they are residents and the PRC as well as the tax arrangements between mainland China and Hong Kong (Macau). Pursuant to the aforesaid requirements when the Final Dividend is distributed to the shareholders of H Shares the Company will generally withhold 10% of the dividend to be distributed to the individual holders of H Shares as individual income tax unless otherwise provided by the tax regulations and relevant tax treaties in which case the Company will withhold and pay individual income tax of such dividend according to the tax rates and procedures as specified by the relevant regulations.(iii) The Company will strictly comply with the relevant PRC tax laws and regulations to withhold for payment the 10% corporate income tax and individual income tax; and the dividend will only be payable to the shareholders whose names appear on the H share register of members of the Company on the Record Date. The Company assumes no responsibility or liability whatsoever for confirming the identity of the shareholders of the Company and for any claims arising from any delay in or inaccurate determination of the identity of shareholders of the Company or any disputes over the withholding mechanism.(iv) The Company has appointed Bank of China (Hong Kong) Trustees Limited as the receiving agent in Hong Kong (the “Receiving Agent”) and will pay to the Receiving Agent the Final Dividend declared for payment to the shareholders of H Shares. The Receiving Agent will hold the dividend by way of trust on behalf of the shareholders of H Shares. Such Final Dividend for H shares is expected to be paid by the Receiving Agent on 10 July 2024 and will be mailed by the H Share Registrar to the shareholders of H Shares who are entitled to receive the same by ordinary post at their own risk. 2. For Mainland investors who hold H Shares of the Company via the Shanghai-Hong Kong Stock Connect Program (i) Dividend payable to Mainland individual and enterprise investors who hold H Shares of the Company via the Shanghai-Hong Kong Stock Connect Program shall be distributed in RMB. The Company has entered into agreement with the Shanghai Branch of China Securities Depository and Clearing Corporation Limited (“CSDC”) pursuant to which the Shanghai Branch of CSDC as the nominee of the holders of H Shares via the Shanghai-Hong Kong Stock Connect Program will receive all cash dividends distributed by the Company and distribute the cash dividends to the relevant investors of H Shares via the Shanghai-Hong Kong Stock Connect Program through its depositary and clearing system. It is expected that the Company would distribute the cash dividends to the Shanghai Branch of CSDC on 10 July 2024. 2(ii) Pursuant to the “Notice on the Relevant Taxation Policies Concerning the PilotInter-connected Mechanism for Trading on the Shanghai Stock Market and the Hong Kong Stock Market (关于沪港股票市场交易互联互通机制试点有关税收政策的通知(财税[2014]81 号))” (Cai Shui [2014] No.81) for Mainland individual investors who invest in the H Shares of the Company via the Shanghai-Hong Kong Stock Connect Program the Company will withhold individual income tax at the rate of 20% in the distribution of dividend. Individual investors may by producing valid tax payment proofs apply to the competent tax authority of CSDC for tax credit relating to the withholding tax already paid abroad. For Mainland securities investment funds that invest in the H Shares of the Company via the Shanghai-Hong Kong Stock Connect Program the Company will withhold individual income tax in the distribution of dividend pursuant to the foregoing provisions. Furthermore for Mainland corporate investors that invest in the H Shares of the Company via the Shanghai-Hong Kong Stock Connect Program the Company will not withhold the income tax in the distribution of dividend and the Mainland corporate investors shall file the tax returns on their own. 3. For Mainland investors who hold H Shares of the Company via the Shenzhen-Hong Kong Stock Connect Program (i) Dividend payable to Mainland individual and enterprise investors who hold H Shares of the Company via the Shenzhen-Hong Kong Stock Connect Program shall be distributed in RMB. The Company has entered into agreement with the Shenzhen Branch of CSDC pursuant to which the Shenzhen Branch of CSDC as the nominee of the holders of H Shares via the Shenzhen-Hong Kong Stock Connect Program will receive all cash dividends distributed by the Company and distribute the cash dividends to the relevant investors of H Shares via the Shenzhen-Hong Kong Stock Connect Program through its depositary and clearing system. It is expected that the Company would distribute the cash dividends to the Shenzhen Branch of CSDC on 10 July 2024.(ii) Pursuant to the“Notice on the Relevant Taxation Policies Concerning the PilotInter-connected Mechanism for Trading on the Shenzhen Stock Market and the Hong Kong Stock Market (关于深港股票市场交互联互通机制试点有关税收政策的通知(财税[2016]127 号))”(Cai Shui [2016] No.127) for Mainland individual investors who invest in the H Shares of the Company via the Shenzhen-Hong Kong Stock Connect Program the Company will withhold individual income tax at the rate of 20% in the distribution of dividend. Individual investors may by producing valid tax payment proofs apply to the competent tax authority of CSDC for tax credit relating to the withholding tax already paid abroad. For Mainland securities investment funds that invest in the H Shares of the Company via the Shenzhen-Hong Kong Stock Connect Program the Company will withhold individual income tax in the distribution of dividend pursuant to the foregoing provisions. Furthermore for Mainland corporate investors that invest in the H Shares of the Company via the Shenzhen-Hong Kong Stock Connect Program the Company will not withhold the income tax in the distribution of dividend and the Mainland corporate investors shall file the tax returns on their own. 4. Should the shareholders of H Shares of the Company have any queries in relation to the aforesaid arrangements they are recommended to consult their tax advisors for relevant tax impact in Mainland China Hong Kong and other countries (regions) on the possession and disposal of the H Shares of the Company. 5. The time and arrangement for distribution of dividend in respect of domestic A Shares of the Company will be announced separately on the website of the Shanghai Stock Exchange. 3By Order of the Board Shanghai Fudan Microelectronics Group Company Limited* Jiang Guoxing Chairman Shanghai PRC 29 May 2024 As at the date of this announcement the Company’s executive Directors are Mr. Jiang Guoxing Mr.Shi Lei and Mr. Yu Jun; non-executive Directors are Ms. Zhang Qianling and Mr. Sun Zheng and independent non-executive Directors are Mr. Cao Zhongyong Mr. Cai Minyong Mr. Wang Pin and Ms. Zou Fuwen.* For identification purposes only 4