Hyundai C-Tech (HCT)
- Provides product testing, verification, and certification of products, calibration and repair of precision measuring equipment.
- http://www.hct.co.kr/

Steco Co., Ltd.
- Maker of TAB (Tape Automated Bonding), COF (Chip On Film), and u-BGA (Micro Ball Grid Arrays).
- http://www.steco.co.kr/

Vatech System Co., Ltd.
- Manufacturer and supplier of digital X-ray systems, dental equipment, and TFT-LCD test systems.
- http://www.vatech.co.kr/

Homecast Co., Ltd
- Manufacturers of digital satellite, cable and terrestrial television receivers. [Korean, English]
- http://www.homecast.net/

Haitai Electronics
- Maker of audio and telecommunication products. Factories in Cheonan and Hwaseong. [Korean, English]
- http://www.etronics.co.kr/english/index.html

LG Innotek
- Electronic components, radars, military communication systems, avionics, test and measuring instruments. [Korean, English]
- http://www.lginnotek.com/

Isu Group
- Divided into ISU Chemical, ISU Ceramics and ISU Petasys. Information about the companies, their products and ongoing research. [Korean, English]
- http://www.isu.co.kr/

Korea Electronics Co., Ltd.
- Manufacturers of capacitors, LCD, tuner and electronic products. Headquartered in Seoul with a factory in Gumi. [Korean, English, Japanese, Chinese]
- http://www.keccorp.com/

Heesung Metal
- Maker of a variety of semiconductor and precious metal products. Corporate profile, product lines, warranties, affiliates. [Korean, English]
- http://www.hsmetal.co.kr/

Hynix Semiconductor Inc.
- Manufactures computer chips. Formerly Hyundai Electronics. [Korean, English]
- http://www.hynix.com/

LG Electronics, Inc.
- Manufactures electronic components and appliances, computer components, and communication equipment. Product, support and corporate information.
- http://www.lge.com/

Samsung Electro-Mechanics
- Manufacturer of a wide range of electronic products from components to completed assemblies.
- http://www.sem.samsung.com/

Samwha Condenser Group
- Manufactures capacitors, transformer cores and filters. Various locations around Korea and other countries. [Korean, English]
- http://www.samwha.co.kr/

Samsung Electronics Corporation
- Manufactures and distributes a full line of electronic devices. Including computers, phones, semiconductors and automation devices.
- http://samsungelectronics.com/