Ambest Group Bhd is an investment holding company. Through its subsidiaries, it operates as an engineering supporting services provider that provides precision machining, to customers in the semiconductor industry. The company also offers additional processes such as sub-modular assembly and surface finishing treatment. The company's business segments are: (i) Precision machining, and (ii) Sheet metal fabrication. The majority of the company's revenue is derived from the Precision machining segment, which involves various processes of working with metal such as milling, turning, and turn-milling to produce precision-machined parts and components.