- Oil & Gas Development Company Ltd. (OGDCL)
- Pakistan Oilfields Ltd. (POL)
- Mari Petroleum Company Ltd. (MPCL)
- Pakistan Petroleum Ltd (PPL)
- Eni Pakistan Ltd.
- MOL Pakistan
- Kuwait Foreign Petroleum Exploration Company (KUFPEC)
- OMV Pakistan
- United Energy Pakistan Ltd. (UEPL)
- Polish Oil & Gas Company Ltd. (POGCL)
- Ocean Pakistan Ltd. (OPL)
- Dewan Petroleum Ltd.
- Descon Engineering
- Siemens Pakistan Engineering Co. Ltd.
- Sui Southern Gas Company Ltd. (SSGC)
- Sui Northern Gas Pipelines Ltd. (SNGPL)
- Sea & Land Drilling Contractors Inc. (Saxon)
- Weatherford Drilling International
- KCA Deutag GmbH
- KS Drilling (Atlantic)
- Hilong Oil Services & Engineering Pakistan(Pvt.)Ltd.
- Bin Qasim Power Station (BQPS)
- Lalpir Power Plant
- HUB Power Plant (HUBCO)
- Uch Power Plant
- Rousch Power Plant
- Fauji Kabirwala Power Complex Ltd. (FKPCL)
- Kot Addu Power Company (KAPCO)
- Pak Arab Fertilizer (Pvt) Ltd.
- Pak American Fertilizer (Pvt) Ltd.
- Fatima Fertilizer Ltd.
- Pak-Arab Refinery Company Ltd.
- Attock Refinery Ltd.
- Pakistan Refinery Ltd.
- National Refinery Ltd.
- Dawood Hercules Chemicals Ltd.
- Presson Descon International Ltd.
- ENAR PETROTECH SERVICES (PVT) LTD.
- Karachi Water & Sewerage Board (KW&SB)
- WAPDA
- Crescent Steel & Allied Products