Mun Siong Engineering Ltd. operates as an investment holding company, which engages in the provision of mechanical engineering services. It operates through the Mechanical; and Electrical, Instrumentation, and Others segment. The Mechanical segment offers mechanical engineering services of pre-fabrication; installation of piping works and mechanical de-coking; re-tubing; and hydro-jetting. The Electrical, Instrumentation and Others segment provides electrical and instrumentation services of installing transformers, switchgears, lightings, lightning protection, grounding system, distribution control system, field instrument, impulse line, and calibration and loop check. The company was founded on April 30, 1969 and is headquartered in Singapore.