Oil & Gas Service Companies in South Korea
| Nr | Company name | Location | Employees | Turnover |
| 1 | Samchully | Seoul, South Korea | 501 – 1,000 | $3.8B |
| 2 | SK Energy & Chemical | Jongno-Gu, South Korea | 1,001 – 5,000 | $3.3B |
| 3 | Korea Oil Corporation | Ulsan, South Korea | 5,001 – 10,000 | $2.8B |
| 4 | Lotte Energy Materials | Seoul, South Korea | 501 – 1,000 | $638.7M |
| 5 | Hyundai Oilbank | Seoul, South Korea | 1,001 – 5,000 | $393.1M |
| 6 | Eagon Industrial | Incheon, South Korea | 201 – 500 | $226.7M |
| 7 | Oceanus | Busan, South Korea | 201 – 500 | $82.6M |
| 8 | P-Oil | Seoul, South Korea | 201 – 500 | $51.6M |
| 9 | POSCO International | Incheon, South Korea | 1,001 – 5,000 | $30M |
| 10 | Coens | Busan, South Korea | 51 – 200 | $21.8M |
| 11 | Hanyu Energy | Gwangju, South Korea | 51 – 200 | $13.6M |
| 12 | Energy China | 11 – 50 | $11.9M | |
| 13 | DJ CHEMISTRY | 11 – 50 | $10.7M | |
| 14 | Okyc | Yeosu, South Korea | 51 – 200 | $8.9M |
| 15 | Korea National Oil | 11 – 50 | $7.7M | |
| 16 | Tectyl | Seoul, South Korea | 11 – 50 | $7.7M |
| 17 | KTB Oil | Seoul, South Korea | 11 – 50 | $6.6M |
| 18 | Energy and Mineral Resources Development Association of Korea | Seoul, South Korea | 11 – 50 | $5.4M |
| 19 | INTRUST ENERGY SOLUTION | Geoje-si, South Korea | 11 – 50 | $5.3M |
| 20 | Systronics | 11 – 50 | $5.1M | |
| 21 | Woolim Shipping | Seoul, South Korea | 11 – 50 | $4.9M |
| 22 | D-Eco Energy | Gyeonggi-do, South Korea | 11 – 50 | $4.4M |
| 23 | LUBCHEM | 11 – 50 | $4.4M | |
| 24 | Daekyung Industrial | 11 – 50 | $4.1M | |
| 25 | Tera Resource | Seoul, South Korea | 11 – 50 | $4M |
| 26 | Neomotec | 1 – 10 | $3.7M | |
| 27 | SK earthon | 11 – 50 | $3.4M | |
| 28 | SK Energy | Seoul, South Korea | 11 – 50 | $3.3M |
| 29 | Directional | Seoul, South Korea | 1 – 10 | $3M |
| 30 | Energy Holdings Group | Seoul, South Korea | 1 – 10 | $2.9M |
| 31 | Kyung Buk Kwang Oil | Daegu, South Korea | 11 – 50 | $2.6M |
| 32 | BioHope | 1 – 10 | $2.3M | |
| 33 | JP Morgan Korea | Seoul, South Korea | 1 – 10 | $2.2M |
| 34 | Seojin Energy | Incheon, South Korea | 1 – 10 | $911,000 |
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