Cahya Mata Sarawak Berhad (CMSB) (MYX: 2852) is a corporation listed on the Main Market of the Malaysian stock exchange, Bursa Malaysia.

On 8 October 1974, CMSB was incorporated as Cement Manufacturers Sarawak Sdn Bhd, at Power Street, Kuching.

[10] The first board meeting was held on 31 October 1974 by Sarawak state financial secretary Bujang Mohd Nor and chief executive of Sarawak Economic Development Corporation (SEDC) Mohd Amin Satem, with four others, including representatives from Sabah Economic Development Corporation (SEDCO).

The interlocking logo represents Yin and yang, reflecting the company's main activities at that time,infrastructure and investment.

In 2007, Employees Provident Fund (EPF) purchased all the RHB shares owned by Utama banking group for RM 2.25 billion.

In the same year, CMSB entered a joint venture with OM Materials Pte Ltd to operate ferrosilicon and manganese ferroalloys Smelter at Similajau Industrial Park.

[11] In 2014, CMSB worked with Germany-based Christian Pfeiffer Maschinenfabrik GmbH to develop a new cement grinding plant in Mambong.

[11] On 9 March 2018, CMSB, Ibraco Berhad and the HELP Education Group signed an agreement to establish Tunku Putra-HELP International School (TPHIS).

its role is the main contractor for Sg Awik to Bintangor Junction in work package contract (WPC06).

[16] In 2003, the subsidiary secured a five-year building contract with Daya Perumahan Sdn Bhd (Daya Perumahan is a unit set up by Housing Development Corporation Sarawak) to supply roofing materials for low-cost housing development projects.

The company supplied roofing materials for 1,098 low-cost houses in Bandar Samariang in Petra Jaya, Kuching.

CMS decided to wind down this company's involvement in housing development while focusing on selling insulation products and materials.