Deep Source Holdings Limited — Board/Management Information 2026

May 8, 2026

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.

DEEP SOURCE HOLDINGS LIMITED

至源控股有限公司*

(Formerly known as Theme International Holdings Limited)

(incorporated in the Bermuda with limited liability)

(Stock Code: 990)

APPOINTMENTS OF EXECUTIVE DIRECTOR, NON-EXECUTIVE DIRECTORS AND INDEPENDENT NON-EXECUTIVE DIRECTOR

The board (the "Board") of directors (the "Directors") of Deep Source Holdings Limited (the "Company") is pleased to announce that with effect from 8 May 2026, Mr. Xu Hang (徐航) ("Mr. Xu") has been appointed as an executive Director of the Company, Mr. Lin Pusheng (林圃生) ("Mr. Lin") has been appointed as a non-executive Director of the Company, Mr. Zhu Haifei (朱海飛) ("Mr. Zhu") has been appointed as a non-executive Director of the Company and Professor Wu Wei (吳偉) ("Prof. Wu") has been appointed as an independent non-executive Director of the Company.

The biographical details of Mr. Xu are set out below:

Mr. Xu Hang (徐航), aged 38, is an executive Director of our Company.

Mr. Xu has approximately 15 years of experience in corporate finance and business development. Before joining the Company, he has served as a finance director in a leading commodity conglomerate in South-East Asia, responsible for group financing, maintaining key external relationships, and contributing to the company's mergers and acquisitions, major project development, and overall strategic development. Also, Mr. Xu previously held a number of leadership and relationship management positions in corporate banking in a major bank, providing support for large corporate clients and corporate financing matters.

Mr. Xu obtained a Master's degree in Science (Professional Accounting and Corporate Governance) from City University of Hong Kong and a Bachelor's degree of Business Administration (Finance) from Macau University of Science and Technology. He has received his qualification in the Institute of Chartered Secretaries and Administrators in Singapore.

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The Company has entered into a service agreement with Mr. Xu in relation to his appointment as an executive Director commencing on 8 May 2026, which is determinable by either party serving on the other not less than 1 month written notice, subject to retirement by rotation and re-election in accordance with the bye-laws of the Company (“Bye-laws”). He has no fixed term of service with the Company. Pursuant to the Bye-laws, Mr. Xu will hold office until the next annual general meeting of the Company and will be eligible for re-election at such meeting. Mr. Xu is entitled to a monthly remuneration of HK$110,000, which was determined with reference to his duties and responsibilities and the prevailing market conditions. He is entitled to receive discretionary bonus.

Mr. Xu has obtained legal advice referred to under Rule 3.09D of the Rules (the “Listing Rules”) Governing the Listing of Securities on the Stock Exchange of Hong Kong Limited (the “Stock Exchange”) and understood his obligations as a director of a listed issuer and the possible consequences of making a false declaration or giving false information to the Stock Exchange.

The biographical details of Mr. Lin are set out below:

Mr. Lin Pusheng (林圃生), aged 36, is a non-executive Director of our Company.

Mr. Lin, is a Chinese national and holds a bachelor’s degree. He studied at People’s Public Security University of China from 2007 to 2011. From November 2009 to December 2011, he served in the 336th Regiment, 112th Division, 38th Group Army of the PLA Ground Force. He has successively held the positions of underground safety officer, mining and processing production staff, technician and dispatcher at Anhui Jinrisheng Mining Co., Ltd. (安徽金日晟礦業有限責任公司); Manager of the Human Resources and Enterprise Management Department, Director of the Operation Center; Chief Commander of the Pellet Project at Anhui Zhongsheng Metal Pellet Co., Ltd. (安徽中晟金屬球團有限責任公司). He also took up temporary training assignments at Hebei Jingye Steel (河北敬業鋼鐵) and Sinosteel Trading Company (中鋼貿易公司). Currently, he serves as Director and General Manager of at Dazhong Mining Co., Ltd. (大中礦業股份有限公司) (Shenzhen Stock Exchange (stock code: 001203)), Chairman of Jinhui Rare Ore (金輝稀礦) and Director of Zhongxing Group (眾興集團). In January 2023, Mr. Lin Pusheng was elected as a Deputy to the People’s Congress of Inner Mongolia Autonomous Region.

Mr. Lin has entered into an appointment letter with the Company in relation to his appointment as a non-executive Director for a term of one year commencing from 8 May 2026 unless terminated by at least one month’s written notice served by either party at any time during the then existing term. Mr. Lin is subject to retirement by rotation and re-election at the next annual general meeting of the Company in

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accordance with the Bye-laws of the Company. Mr. Lin is entitled to receive a monthly director’s fee of HK$100,000, which is determined with reference to his duties and responsibilities and the prevailing market conditions. He is entitled to receive discretionary bonus.

Mr. Lin has obtained legal advice referred to under Rule 3.09D of the Listing Rules and understood his obligations as a director of a listed issuer and the possible consequences of making a false declaration or giving false information to the Stock Exchange.

The biographical details of Mr. Zhu are set out below:

Mr. Zhu Haifei (朱海飛), aged 47, is a non-executive Director of our Company.

Mr. Zhu is a Chinese national and holds an associate degree. From August 2008 to present, he has been serving as director and General Manager of Wuxi Tuohai Investment Co., Ltd. (無錫拓海投資有限公司). From January 2015 to present, he has been serving as an executive director and General Manager of Wuxi Tuohai Equity Investment Fund Management Co., Ltd. (無錫拓海股權投資基金管理有限公司). From May 2025 to present, he has been serving as a director of Wuxi Haotian Yiyi Investment Co., Ltd. (無錫浩天一意投資有限公司). From August 2025 to present, he has been serving as an appointed representative of the Executive Partner of Ningbo Meishan Bonded Port Area Lanhai Toukong Investment Management Center (Limited Partnership) (寧波梅山保稅港區藍海投控投資管理中心(有限合夥)). From September 2025 to present, he has been serving as Chairman and General Manager of Zhejiang Dongjing Electronics Co., Ltd. (浙江東晶電子股份有限公司) (Shenzhen Stock Exchange (stock code: 002199)).

Mr. Zhu has entered into an appointment letter with the Company in relation to his appointment as a non-executive Director for a term of one year commencing from 8 May 2026 unless terminated by at least one month’s written notice served by either party at any time during the then existing term. Mr. Zhu is subject to retirement by rotation and re-election at the next annual general meeting of the Company in accordance with the Bye-laws of the Company. Mr. Zhu is entitled to receive a monthly director’s fee of HK$20,000, which is determined with reference to his duties and responsibilities and the prevailing market conditions. He is entitled to receive discretionary bonus.

Mr. Zhu has obtained legal advice referred to under Rule 3.09D of the Listing Rules and understood his obligations as a director of a listed issuer and the possible consequences of making a false declaration or giving false information to the Stock Exchange.

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The biographical details of Prof. Wu are set out below:

Professor Wu Wei (吳偉), aged 70, is an independent non-executive Director of our Company.

Prof. Wu has held senior roles including, amongst others, associate dean of the College of Humanities, Arts and Social Sciences at Nanyang Technological University, Singapore. Prof. Wu has served as an independent director of VCPlus Limited since July 2024, the shares of which are listed on the Catalyst Board of Singapore Stock Exchange (SGX: 43E). He has also served as an independent director of China Liquor Pte. Ltd. since 2019.

Prof. Wu obtained a Ph.D. from Indiana University, the United States in May 1997, a master's degree of arts from Stanford University in June 1987, a master of arts degree from Xiamen University in August 1986 and a bachelor's degree in English studies from Xiamen University in July 1983.

Prof. Wu has entered into an appointment letter with the Company in relation to his appointment as an independent non-executive Director for a term of one year commencing from 8 May 2026 unless terminated by at least one month's written notice served by either party at any time during the then existing term. He is subject to retirement by rotation and re-election at the next annual general meeting of the Company in accordance with the Bye-laws of the Company. He is entitled to receive a monthly director's fee of HK$20,000, which is determined with reference to his duties and responsibilities and the prevailing market conditions.

Prof. Wu has obtained legal advice referred to under Rule 3.09D of the Listing Rules and understood his obligations as a director of a listed issuer and the possible consequences of making a false declaration or giving false information to the Stock Exchange.

Prof. Wu has confirmed (i) his independence in accordance with Rule 3.13 of the Listing Rules; (ii) he had no past or present financial or other interest in the business of the Group or any connection with any core connected persons (as defined in the Listing Rules) of the Company; and (iii) there are no other factors that may affect his independence at the time of his appointment.

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Save as disclosed above, as at the date of this announcement, Mr. Xu, Mr. Lin, Mr. Zhu and Prof. Wu (i) do not hold any other positions with the Company and other members of the Group; (ii) do not hold any directorships in any other public companies the securities of which are listed on any securities market in Hong Kong or overseas in the last three years; (iii) do not hold any other major appointments and professional qualifications; (iv) do not have any other interest in any shares, underlying shares or debentures of the Company or any of its associated corporation which are required to be disclosed pursuant to Part XV of the SFO; and (v) do not have any relationships with any Directors, senior management or substantial or controlling shareholders (as respectively defined in the Listing Rules) of the Company.

Save as disclosed above, the Board is not aware of any other information relating to the appointments of Mr. Xu, Mr. Lin, Mr. Zhu and Prof. Wu as directors that are required to be disclosed pursuant to any of the requirements of Rules 13.51(2)(h) to 13.51(2)(v) of the Listing Rules or needs to be brought to the attention of the shareholders of the Company.

The Board would like to welcome Mr. Xu, Mr. Lin, Mr. Zhu and Prof. Wu to the Board.

By Order of the Board
Deep Source Holdings Limited
Wu Lei
Executive Director

Hong Kong, 8 May 2026

As at the date of this announcement, the executive Directors are Mr. Jiang Jiang, Mr. Wu Lei and Mr. Xu Hang; the non-executive Directors are Mr. Kang Jian, Mr. Lin Pusheng, Mr. Zhu Haifei and Mr. Ding Lin; and the independent non-executive Directors are Prof. Wu Wei, Mr. Wong Hok Bun Mario, Ms. Chan Lai Ping and Mr. Liu Song.

• For identification purpose only