Sum Technology Bhd is an investment holding company. Through its subsidiaries, the company is principally involved in mechanical and electrical engineers and engineering works, contractors and consulting engineers for utilities piping and cleanroom architecture works, trading of customised industrial MVAC products and solar PV panels and manufacturing of customised industrial MVAC products. Its business segments: Turnkey solutions, Manufacturing of MVAC products, and Trading. The majority of revenue is derived from the Turnkey solutions segment, which covers controlled environment, such as cleanrooms, and mission critical MEPF utilities for customers and/ or end users in the semiconductor, consumer products, and data centre sectors.