-  - 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