Czech CEZ to replace Orbis in blue-chip WIG 20 index after Dec 15. The Czech energy group CEZ is to enter the blue-chip WIG 20 stock exchange index after the Friday session on Dec 15, so de facto on Dec 18. It will replace Orbis on the WIG20, the stock exchange announced in a communique on Friday. There will also be changes in the MID-WIG index from that date. CEZ debuted on the Warsaw bourse on Oct 25 and boosted the capitalization of the WSE by approximately 15%. The value of foreign companies' shares on the WSE thus increased by more than 70%. ISB, tom