Ko Yo Chemical (Group) Limited 玖源化工（集團）有限公司 (Incorporated in the Cayman Islands with limited liability) （於開曼群島註冊成立的有限公司） (Stock Code 股份代號: 00827) NOTIFICATION LETTER 通知信函 Dear Non-registered Shareholder(s)(Note 1) , 4 September 2025 The following document(s) of Ko Yo Chemical (Group) Limited (the "Company") has/have been prepared in English and Chinese and is/are available on the websites of the Company at www.koyochem.com and The Stock Exchange of Hong Kong Limited at www.hkexnews.hk (collectively "Website ...