B3 classifies companies currently listed by sector into 3 distinct levels (from broadest to most restrictive): sector, subsector and segment. In other words, a sector may have companies from several subsectors, and a subsector may have companies from several segments. Additionally, each listed company may have several different trading codes (for common and preferred shares, for example)..

Below is the current classification tree for the listed companies, including the ticker symbol(s) for each company. You can explore the classification by "opening" or "closing" each item. There are also buttons to open or close all sectors, subsectors and segments at once for easier viewing.