Assam Gas Company Ltd.
Balmer Lawrie 
Bharat Petroleum Corp Ltd
Bharat Shell
Bongaigaon Refineries
Castrol India Ltd.
Caltex 
Coal India Ltd.
Chennai Petroleum Corp Ltd.
Essar Oil Limited
Gas Authority India Ltd
Gujarat Gas India Ltd
Gujarat State Petronet Ltd.
Gulf Oil India Ltd
Hindustan Petroleum Corp Ltd
IBP Company Ltd.
Indraprastha Gas 
Indian Oil Corporation Ltd
Kochi Refineries Ltd
Mangalore Refinery Pvt. Ltd
Numaligarh Refinery Pvt. Ltd
Oil & Natural Gas Corp. Ltd.
Oil India Ltd.
Petronet India Limited
Port of Pipava
Rasgas India Limited
Shell India Limited
Veetol

Chemicals / Dyes / Coke
Cargo Handling
Consultancy
Computers
Constructions
Disposal
Diesels
Electricity / Electronics
Fire Fighting Equipments
Furnishing / Furniture
Gas Manufacturer / Dist.
Hire / Rental
Lifting / Handling equipment
Machining / Machinery
Minerals
Mining works
Miscellaneous 
Motor Part and accessories
Nuclear Fuel
Office Machinery / Eqpt.
Oven / Furnace
Petro. Product
Petroleum / Gas Extraction
Pipeline / Transportation 
Pollution Control Eqpt. work 
Repair & Maintenance
Shipping 
Storage / warehousing