- Malaysia Marine Heavy Engineering Sdn. Bhd (MMHE)
- Sime Darby Engineering Sdn. Bhd
- Petronas Gas Berhad
- Shin Eversendai Sdn. Bhd
- Nam Fatt Construction Berhad
- IJM Properties Sdn. Bhd
- Kencana HL
- Ranhill Construction Sdn. Bhd
- PETRONAS Fertilizer (Kedah) Sdn Bhd
- PETRONAS Penapisan (Terengganu) Sdn Bhd
- Ethylene/ Polyethylene Malaysia Sdn Bhd
- MTBE (Malaysia) Sdn Bhd
- Optimal Group of Companies
- PETRONAS Ammonia Sdn Bhd
- Vinyl Chloride (Malaysia) Sdn Bhd
- PETLIN (Malaysia) Sdn Bhd
- BP Petronas Acetyls Sdn Bhd
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- Tanjung Maintainance Services Sdn. Bhd
- Malaysia Airlines System
- Swiss Garden Spa & Resort
- Kapar Energy Ventures Sdn. Bhd
- Petlog Sdn. Bhd
- Kertih Port Sdn Bhd
- Kemaman Supply Base Sdn Bhd
- Tenaga Nasional Berhad
- Tenaga Energy Services Sdn Bhd
- Foster Wheeler
- Kaefer (M) Sdn Bhd
- Woodside Energy Limited
- KNM Ogpet (East Coast) Sdn Bhd
- Alam Hidro Sdn Bhd
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