B3 sector classification, explained

The structure

B3, Brazil’s stock exchange, groups listed companies by economic activity: by what a company predominantly does, and who its customers are, rather than by size or index membership. The grouping runs from broad economic sector down through subsector to segment.

At the top level there are 10 sectors. Our catalogue maps 346 listed companies across them:

Oil, Gas & Biofuels (Petróleo, Gás e Biocombustíveis): 13 companies.

Basic Materials (Materiais Básicos): 31 companies.

Industrial Goods (Bens Industriais): 50 companies.

Non-Cyclical Consumer (Consumo Não-Cíclico): 25 companies.

Cyclical Consumer (Consumo Cíclico): 89 companies.

Financials (Financeiro): 51 companies.

Utilities (Utilidade Pública): 43 companies.

Healthcare (Saúde): 22 companies.

Information Technology (Tecnologia da Informação): 15 companies.

Communications (Comunicações): 7 companies.

The concentration is the first thing worth noticing. Cyclical consumer, financials and industrial goods together hold more listed companies than most of the remaining sectors combined. That is a fact about the Brazilian market, not about the classification.

Why sector alone is not enough

Sector answers “what does this company do?”. It does not answer “what is this story about?”, and for an investor those two diverge constantly.

Agribusiness is the clearest case. A fertiliser producer sits in basic materials, a grain trader in non-cyclical consumer, the railway that moves the harvest in industrial goods, and the bank financing the crop in financials. Four sectors, one theme. Anyone following Brazilian agribusiness by sector alone reads most of the market to find it.

The same holds for anything regulatory. A tariff decision by the electricity regulator lands in utilities, but the reason it matters may be a company in an entirely different sector that buys the power.

The layer we add

That gap is why we run 6 thematic verticals alongside the 10 sectors: macro and fiscal policy, agribusiness, energy and ESG, capital markets and M&A, legal and regulatory, and investment funds including Brazilian REITs.

These are ours, not B3’s. The sector classification belongs to the exchange and is a fact about the company; the verticals are an editorial layer and are a claim about the story. Keeping the two apart matters, because only one of them is authoritative.

A single filing can land in one, the other, or both: a fertiliser producer’s material fact is basic materials by sector and agribusiness by theme, and an investor following either should see it.

Where to check

B3 publishes the classification and its constituent lists on its own site, and revises them as companies change activity, list or delist. Any third-party mapping, ours included, is a snapshot of the exchange’s and should be checked against it when precision matters.