CHANGE OF DIRECTORS ANDCHANGE IN COMPOSITION OF BOARD COMMITTEES

Hong Kong Exchanges and Clearing Limited and The Stock Exchange of Hong Kong Limited take no responsibility for the contents of this announcement make no representation as to its accuracy or completeness and expressly disclaim any liability whatsoever for any loss howsoever arising from or in reliance upon the whole or any part of the contents of this announcement.成都四威科技股份有限公司 CHENGDU SIWI SCIENCE AND TECHNOLOGY COMPANY LIMITED (a sino-foreign joint stock company incorporated in the People’s Republic of China) (Stock Code: 1202) CHANGE OF DIRECTORS AND CHANGE IN COMPOSITION OF BOARD COMMITTEES The Board announces with effect from 28 June 2024: (i) Mr. Zhu Rui has resigned as an executive Director and a member of the Nomination Committee; and (ii) Mr. Xu Jiaxin has been appointed as an executive Director and a member of the Nomination Committee.CHANGE OF DIRECTORS The board (the ‘‘Board’’) of directors (the ‘‘Directors’’) of Chengdu SIWI Science and Technology Company Limited (the ‘‘Company’’ together with its subsidiaries the ‘‘Group’’) announces that Mr. Zhu Rui (‘‘Mr. Zhu’’) has resigned as an executive Director and a member of the Nomination Committee of the Company (the ‘‘Nomination Committee’’) with effective from 28 June 2024 as he requires to devote more time on pursuing other business commitment.Mr. Zhu confirmed that they have no disagreement with the Board and there are no matters relating to his resignation that need to be brought to the attention of the shareholders of the Company.The Board would like to take this opportunity to express its gratitude to Mr. Zhu for his contributions to the Company during his tenure of office.The Board further announces that it has resolved to appoint Mr. Xu Jiaxin (‘‘Mr. Xu’’) as an executive Director and a member of the Nomination Committee with effect from 28 June 2024 until the end of the tenth session of the Board of the Company. – 1 –The biographical details of Mr. Xu are as follows: Mr. Xu Jiaxin aged 39 is a professorate senior engineer with the master of science degree in Optics from Jilin University (吉林大学) and is currently the professional technical leader (presiding over the work) and a professorate senior engineer of the 29th Research Institute of China Electronics Technology Group Corporation (the ‘‘29th Research Institute’’). Mr.Xu has successively served different positions including assistant engineer engineer and senior engineer of the 29th Research Institute. Mr. Xu has extensive experience in the fields of optical information processing and application.The Company has entered into a service contract with Mr. Xu in relation to his directorship as an executive Director until the conclusion of the tenth session of the Board. Mr. Xu will not be entitled to any remuneration as an executive Director from the Company.As at the date of this announcement save as disclosed above Mr. Xu (i) does not have any relationship with any Directors senior management or substantial or controlling shareholders of the Company; (ii) does not have any interest in any shares or underlying shares or any debentures of the Company and its associated corporations within the meaning of Part XV of the Securities and Futures Ordinance (Chapter 571 of the Laws of Hong Kong); (iii) does not hold any other directorships in public companies the securities of which are listed on any securities market in Hong Kong or overseas in the last three years nor other major appointments and professional qualifications; and (iv) does not hold any other positions with other members of the Group.Save as disclosed above there is no other information to be disclosed pursuant to the requirements of Rule 13.51(2)(h) to (v) of the Rules Governing the Listing of Securities on The Stock Exchange of Hong Kong Limited and there are no other matters relating to the appointment of Mr. Xu that needs to be brought to the attention of the shareholders of the Company.CHANGE IN COMPOSITION OF BOARD COMMITTEES The Board further announces that Mr. Zhu has resigned as a member of the Nomination Committee and Mr. Xu has been appointed as a member of the Nomination Committee with effective from 28 June 2024.By order of the Board Chengdu SIWI Science and Technology Company Limited Li Tao Chairman Chengdu the PRC 28 June 2024 – 2 –As at the date of this announcement the Board comprises: Executive Directors: Ms. Li Tao (Chairman) Mr. Wu Xiaodong Mr. Hu Jiangbing Mr. Jin Tao Mr. Chen Wei Mr. Xu Jiaxin Independent Non-executive Directors: Ms. Fu Wenjie Mr. Zhong Qishui Mr. Xue Shujin –3–