- Kaduna Refining and Petrochemical Limited/NNPC
- Conoil Plc.
- PPMC/NNPC
- Oando Plc
- DKG ITCC Oil And Gas Engineering Ltd.
- Delattre Bezons Nig. Ltd (DBN)
- DSD Nig. Ltd.
- Gilmor Engineering (Nig) Ltd, Abuja.
- Lee Engineering and Construction Company Ltd.
- Federal Ministry of Agriculture and water Resources.
- Supasteel Nigeria Limited.
- Nigeria Breweries Plc.
- Unisteel works Ltd.
- ARMECO
- West African Ceramics Limited
- Chrome Oil services Limited
- Churchgate Limited
