Overview

To prevent a reoccurrence of dramatic market movements similar to the plunge of the KOSPI index on
November 11, 2010 and to alleviate a settlement risk involving institutional investors, the Financial
Services Commission approved amendments to the Derivatives Market Business Regulations and the Enforcement Rules of the DMBR of the Korea Exchange with respect to the post-trading margin requirement and unsettled contracts position limit.

The amendments on the post-trading margin requirement will be effective on March 28, 2011, and those on the net open position limit will be effective on March 7, 2011. The Amendments are summarized by Kim & Chang in this briefing.