PETRONAS PENAPISAN (MELAKA) SDN BHD, MELAKA
PETRONAS FERTILIZER (KEDAH) SDN BHD, GURUN
ETHYELENE (M) SDN BHD, KERTEH
TNB RESEARCH SDN BHD, BANGI.
TNB REPAIR & MAINTENACE SDN BHD, BANGI
PETLIN SDN BHD, KERTEH
PETRONAS DAGANGAN BERHAD, KL
PETRONAS PENAPISAN (TERENGGANU), KERTEH
KERTEH TERMINAL SDN BHD, KERTEH
ASEAN BINTULU FERTILIZER SDN BHD, BINTULU
BASF PETRONAS CHEMICAL SDN BHD, GEBENG
VINYL CHLORIDE (M) SDN BHD, KERTEH
PETRONAS GAS BERHAD (COMPLEX A & B), KERTEH
CUF (M) SDN BHD , KERTEH
PETRONAS AMMONIA SDN BHD, KERTEH
OGP TECHNICAL SERVICE SDN BHD, K.LUMPUR
HICOM PETROPIPE SDN BHD, SG.PETANI
NAMFATT FABRICATOR SDN BHD, SHAH ALAM
NAMFATT ENERGY SDN BHD, SHAH ALAM
BUREAU VERITAS (M) SDN BHD, K.LUMPUR
MALAYSIA SHIPYARD AND ENGINEERING, JOHOR
SIME SEMBAWANG ENGINEERING, JOHOR
PROMET FABRICATOR , JOHOR
NAVAL DOCKYARD SDN BHD, LUMUT
BAUHR (M) SDN BHD, K.LUMPUR
TOYO ENG. CORP. KERTEH
BP PETRONAS ACETYLS SDN BHD, KERTEH
OPTIMAL CHEMICAL SDN BHD, KERTEH
SHELL REFINING COMPANY, PORT DICKSON
OPTIMAL GROUP OF COMPANIES, KERTEH
MLNG SDN BHD, BINTULU
NIPPON OIL, MIRI SARAWAK