INSEE Lanka appoints new Chief Executive Officer

Siam City Cement (Lanka) Limited (INSEE Lanka) has announced the appointment of Eng. Thusith C. Gunawarnasuriya as its new Chief Executive Officer, effective January 1, 2026. 

He succeeds Nandana Ekanayake, who will continue to serve as Chairman, ensuring leadership continuity and strategic stability for the organisation.

A long-standing contributor to INSEE’s journey, Gunawarnasuriya has worked with the company through its evolution under Holcim (Lanka) Ltd, LafargeHolcim and INSEE, playing pivotal roles that influenced both operational progress and strategic direction.

Rejoining INSEE Lanka in January 2025 as Chief Operating Officer, he has since demonstrated exceptional leadership, driving topline growth, improving EBITDA performance and strengthening talent development initiatives that enhanced organisational capability and business outcomes.

His expertise in business strategy, operations excellence and supply chain transformation is well-recognised, supported by over 25 years of multi-industry and multi-country leadership experience. 

His career includes senior positions at Lion Brewery (Ceylon) PLC, Hemas Manufacturing, Fonterra Brands Lanka, GlaxoSmithKline, MAS Active and DMS Software Engineering. His international exposure spans India, Bangladesh and Thailand.

Gunawarnasuriya is a proud alumnus of Dharmaraja College, Kandy and holds a BSc (Hons) in Electrical and Electronic Engineering from the University of Peradeniya, an MBA from the University of Colombo and an MSc in Business and Organisational Psychology from Coventry University, UK. 

He has completed executive leadership programmes at IMD (Switzerland) and the National University of Singapore. He is also a member of IEEE (US), CILT (UK), ISMM (Sri Lanka) and IESL (Sri Lanka).