Steps of the Method 1：
Query on Market Observation Post System-Homepage：
http://newmops.tse.com.tw/

(Click)New Version →Material Information and Announcement→Historical Material Information of the TWSE or TPEx Listed Company(Including Material Information before December 30, 2009) →

Enter the Stock Code 8423→By Year, Month and Day → Search

Steps of the Method 2：
Query on Market Observation Post System → Historical Material Information of the TWSE or TPEx Listed Company(Including Material Information before December 30, 2009)
http://mops.twse.com.tw/mops/web/t05st01

Enter the Stock Code 8423→By Year, Month and Day → Search