Douglas OHI was established in partnership with Interserve plc (formerly known as Tilbury Douglas plc). Known for its professional methods and track record for excellence and high safety standards, Douglas OHI has added several buildings and structures to the local landscape of Oman. It is approved as an excellent-grade contractor and continues to be at the forefront of construction activities in Oman.

OITC specialises in supply and laying of fiber optic cables, Outside Plant (OSP) & Inside Plant (ISP) work, Telecommunication works, Control System & Automation, Specialized ELV Master System Integrator and related Civil works for providing end-to-end services.

To many companies around the world, HIMA is the first port of call for safety-related automation solutions. The secret of its success is the uncompromising focus on safety. What makes HIMA solutions unique is the combination of maximum safety and maximum availability, a belief encapsulated in 'Safety. Nonstop.' This has helped HIMA customers achieve safe, uninterrupted operations and helped realise their business goals. In order to extend local support, HIMA Middle East LLC was incorporated in Oman.

A joint venture with Fugro International, the company specialises in Geotechnical, Geophysical and Hydrographic Surveys and also in Positioning services and Airborne Surveys. Fugro has laboratory facilities for material and soil testing and provides specialised consultancy services to the local contracting companies. The company offers vehicle tracking systems and other security and monitoring services to transport contractors and fleet owners.

Incorporated in 2018, MAN Energy Solutions Muscat LLC is a service facility for the oil & gas sector located in Rusayl, situated south-west of Muscat (Oman). The MAN PrimeServ one-stop shop in Oman was built under a Joint Venture between MAN Energy Solutions and OHI Petroleum & Energy Services (OPES). The company’s activities cover exploration for oil and gas, production of power and consumable water as well as related services to the several exploration and production companies such as the major state oil company Petroleum Development Oman (PDO).

Oman Inspection & Certification Services LLC is a third party inspection and certification organisation founded in 2016. The company provides total engineering, asset integrity, quality assurance, quality control and NDT services.