 The highest value of the index to 22 September 2006, was on that day, at 4467.74.Other indices on the Banja Luka Stock Exchange are the BIRS (an index of 12 leading shares) and ERS10 (an index of 10 companies from the power utility sector).All of the companies listed on this index include the abbreviation a.d. ("akcionarsko drušvo") at the end of their name, indicating their status of a public limited company.