CROBis is an official Zagreb Stock Exchange bond index. The ZSE started publishing it on October 1, 2002. The base date of the index is September 30, 2002 and the base value is set on 100. CROBIS is price index weighted by market capitalization. The weight of any individual bond issue in CROBIS is limited to 35% of the index capitalization. Once a day after the close of trading session. Average daily prices weighted by traded volume, are used for the calculation. If a bond was not traded on the given day, the previous average price is used.