LG Investment and Securities Co., Ltd. - Brokerage firm serving the Korean market. Includes online trading system to be used by foreign clients. [Korean, English] - http://www.wooriwm.com/eng/
Samsung Securities - Brokerage firm offering news, stock quotes and real time trading. Headquartered in Seoul with offices worldwide. [Korean, English, Chinese] - http://www.cyberstock.co.kr/ir/english/
National Information and Credit Evaluation, Inc. - Corporate and personal credit information and ratings service. Locations in Mapo-gu and Yeongdeungpo-gu. [English, Korean] - http://eng.nice.co.kr/
Meritz Securities - Brokerage firm serving the Korean market. Offering investment guide, stock quotes and research. [English, Korean] - http://english.imeritz.com/
Kosdaq - Stock market exchange for high-tech start-ups and SMEs. [Korean, English] - http://www.kosdaq.or.kr/