- AES Pakgen / AES Lalpir
- Attock Refinery Ltd.
- AJCC
- BP Pakistan
- Bin Qasim Power Station (BQPS)
- China Petroleum Engineering & Construction (Group) Corporation
- Crescent Steel & Allied Products
- Dewan Petroleum Ltd.
- Descon Engineering
- Dawood Hercules Chemicals Ltd.
- Data Steel Pipe Industries
- Eni Pakistan Ltd.
- Etimaad Engineering
- ENAR PETROTECH SERVICES (PVT) LTD.
- Fauji Kabirwala Power Complex Ltd.
- Fatima Fertilizer Ltd.
- Global Drilling (Pvt) Ltd.
- Gulf Engineering
- HUBCO
- Haroon Engineering
- KCA Deutag
- Kot Addu Power Company
- Karachi Water & Sewerage Board (KW&SB)
- Mari Gas Company Ltd.
- MOL Pakistan Oil & Gas Co. B. V.
- National Refinery Ltd.
- Oil & Gas Development Company Ltd.
- OMV Pakistan
- Orient Petroleum Incorporation. (OPII)
- Pakistan Oilfields Ltd.
- Pakistan Petroleum Ltd (PPL)
- Polish Oil & Gas Company Ltd. (POGCL)
- Petronas Carigali Pakistan Ltd.
- Pak Arab Fertilizer (Pvt) Ltd.
- Pak American Fertilizer (Pvt) Ltd.
- Pak-Arab Refinery Company Ltd.
- Pakistan Refinery Ltd.
- Presson Descon International Ltd.
- Rousch
- Siemens Pakistan Engineering Co. Ltd.
- Sui Southern Gas Company Ltd.
- Sui Northern Gas (Pvt.) Ltd.
- Schlumberger
- Shashi Steel Pipe Works (Pvt.) Ltd
- Uch Power Plant
- Weatherford
- WAPDA