Siam Cement PCL : Election of a new director replacing the resigned director, appointment of the Chairman and appointment and assignment of roles and responsibilities of the directors

-Translation-

CSO S61- 127

April 25, 2018

ToPresident

The Stock Exchange of Thailand

Subject: Election of a new director replacing the resigned director, appointment of the Chairman and appointment and assignment of roles and responsibilities of the directors

Reference is made to the March 29, 2018 notification of The Siam Cement PublicCompany Limited (or "SCC") to the Stock Exchange of Thailand regarding the resignation of Mr.Chirayu Isarangkun Na Ayuthaya,Chairman of the Board of Directors, from his directorship of the Company.

SCC hereby notifies that the Board of Directors' Meeting, held on April 25, 2018, resolved to elect Police Colonel Thumnithi Wanichthanom in replacement of the vacant position, to be effective from April 25, 2018 onwards and appoint Air Chief Marshal Satitpong Sukvimol to be the Chairman of the Board of Directors. The Board of Directors' Meeting further resolved to appoint and assign roles and responsibilities of the directors and in the sub-committees as detailed in the attachment.

Please be informed accordingly.

Yours faithfully,

The Siam Cement Public Company Limited

- signed by -

(Mr. Roongrote Rangsiyopash)

President & CEO

Attachment

Board of Directors of The Siam Cement Public Company Limited

• 1. Air Chief Marshal Satitpong Sukvimol

• 2. Mr. Sumet Tantivejkul

• 3. Mr. Kasem Watanachai

• 4. Police Colonel Thumnithi Wanichthanom

• 5. Mr. Pricha Attavipach

• 6. Mr. Chumpol NaLamlieng

• 7. Mr. Tarrin Nimmanahaeminda

• 8. Mr. Pramon Sutivong

• 9. Mrs. Tarisa Watanagase

• 10. Mr. Kan Trakulhoon

• 11. Mr. Prasarn Trairatvorakul

• 12. Mr. Roongrote RangsiyopashChairman

Member, Governance and Nomination Committee

Vice Chairman, Independent Director

Chairman, Governance and Nomination Committee Member, CSR Committee for Sustainable Development

Director

Chairman, CSR Committee for Sustainable Development

Director

Member, Governance and Nomination Committee

Independent Director

Member, Audit Committee

Member, Governance and Nomination Committee

Independent Director

Chairman, Remuneration Committee

Independent Director

Chairman, Audit Committee

Member, Governance and Nomination Committee

Independent Director

Member, Audit Committee Member, Remuneration Committee

Independent Director

Member, Audit Committee

Member, Governance and Nomination Committee

Director

Member, CSR Committee for Sustainable Development

Director

Member, Remuneration Committee

Member, CSR Committee for Sustainable DevelopmentPresident & CEO

Member, CSR Committee for Sustainable Development

……………………………… ..