the following are the top manufacturing companies in South Korea :

1. bh system co. ltd
2. ENTEC Electric & Electronic Co. Ltd
3. Namsung Industries Co
4. cw hydro pump is Industrial pump company .
5. CNB Technology Inc is an innovative solution provider and one of the global leading manufacturers of video surveillance products.
6. IDIS cctv is a global security company that designs, develops, and manufactures surveillance solutions for a wide range of commercial and public sector markets.
7. RONIX cctv is a manufacturer active in designing, production and sales of high definition surveillance solutions, Megapixel HD-SDI, Full HD Network, Analog cameras and peripheral devices.
8. Dongyang Unitech Co. Ltd was founded in 1997. The company’s line of business includes the manufacturing of ophthalmic frames, lenses, and sunglass lenses.
9. PROBE DIGITAL Co. Ltd is the global leader in network video products and the leading independent provider of IP video surveillance solutions
10. RIFATRON,Co. Ltd is DVR/NVR-only-focused manufacturer since 1998 in KOREA, front runner of video surveillance industry with the full range of the products on cutting edge technology.  
11. Chang Sung Ace Co Ltd is one of the top leading fire suppression companies in Korea.
12. Rezontech Co. Ltd Development and manufacture of fire detector sensor, Hardware, software design and manufacturing of disaster prevention facilities, Technical design and manufacture of safety management equipment and Special firefighting equipment construction.
13. LS Cable & System ltd , established in 1962, has been contributing to building power grids and communication networks first in Korea and then in countries all over the world by developing, producing and providing cables and related solutions used in daily life and throughout many industries. Furthermore, the company set the stage for industrial and economic development by capitalizing on our innovative technology to supply various special industrial cables and industrial materials.
14. alto lighting Founded in 1984 with its headquarter in Seoul, ALTO pursues to develop high-tech and eco-friendly lighting solutions with concept of “Lighting for health”.
15. Union Light Co. Ltd. is the largest comprehensive developer of lighting equipment in Korea such as emergency lights and 40 other types of rechargeable lights.
16. sigma is a respected provider of elevators and escalators with an unmatched heritage offering a range of elevator, escalators, and moving walks
17. SsangYong Motor is south Korea-based automobile manufacture .
18. Hyundai Motor Company is a South Korean multinational automotive manufacturer
19. Genesis Motor LLC (Genesis )  is the luxury cars division of the  Korean vehicle manufacturer Hyundai Motor Group
20. Kia Motors Corporation is a South Korean multinational automotive manufacturer .
21. Hankook Tire & Technology group is a South Korean tire manufacturer .
22. Kumho Tire ( Samyang Tire) is a Korean Tyre manufacturer.
23. Nexen Tire Corporation is a tire manufacturer
24. KR Motors Co. Ltd  is a South Korean motorcycle manufacturer.
25. Hanwha Techwin is a leading video surveillance solution , Access Control and Intruder Detection manufacturer .