Mr. Vanchai Tosomboon

Positions: Chairman of the Board, Authorized Director and Member of the Nomination and Remuneration Committee
Age: 75 years
Nationality: Thai
Education
● Master’s Degree in Business Management, Asian Institute of Management
● Bachelor’s Degree in Law, Thammasat University
● Certificate: Thai Institute of Directors (IOD)
    ▪ Director Certification Program (DCP), Class 7/2001
    ▪ Director Accreditation Program (DAP), Class 7/2004
    ▪ Advanced Audit Committee Program (AACP), Class 19/2015
    ▪ Corporate Governance for Capital Market Intermediaries (CGI), Class 10/2015
    ▪ Board Nomination and Compensation Program (BNCP), Class 9/2020
    ▪ Role of the Chairman Program (RCP), Class 52/2022
• Managing Corporate Resources, International Institute for Management Development (IMD), Switzerland, 2000
• Breakthrough Program for Senior Executives, International Institute for Management Development (IMD), Switzerland, 2002
• Senior Management Program, International Institute for Management Development (IMD), Switzerland, 2006
Date of Appointment: April 21, 1999
Period of Directorship: Holding Director Position from 1999 until present for a total of 25 years and 8 months.
Shareholding in the Company as at December 31, 2024: 760,000 shares or 0.145 percent of all shares with voting rights
Direct and indirect interest in any of business with Company and its subsidiaries: None
Family Relationship with Executives: None
Number of Director Positions in other Business
• Listed Company: None
• Non-Listed Company: None
Past 5-Year Work Experience:
    2014-Mar 2024: Member of the Nomination and Compensation Committee, Siam City Cement Public Co., Ltd.
    2004-Mar 2024: Director, Siam City Cement Public Co., Ltd.
    2015-Apr 2023: Director, Chip Mong Insee Cement Corporation (Registered in Cambodia)
    2014-Sep 2023: Independent Director and Audit Committee Member, Krungsri Securities Public Co., Ltd.
    2012-2021: Consultant, Siam City Cement Public Co., Ltd.
    2014-2020: Member of Governance Committee, Siam City Cement Public Co., Ltd.
    2017-2019: Director, Siam City Cement (Vietnam) Limited (Registered in Vietnam)
    2016-2019: Director, Siam City Cement (Lanka) Limited (Registered in Sri Lanka)
    2004-2011: Director and Executive Vice President (Saraburi Operation), Siam City Cement Public Co., Ltd.
    2002-2016: Director, Conwood Co., Ltd.
    2004-2005: Chairman of the Board, Karat Faucet Co., Ltd.
    1999-2005: Managing Director and Chairman of Executive Board, Royal Porcelain Public Co., Ltd.
    1999-2004: Managing Director, Diamond Roofing Tiles Public Co., Ltd.

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