Why do we group companies into sectors at all?

You've spent four courses valuing a single company — its statements, its cash flows, its intrinsic value. This course zooms out one level. A company is never valued in a vacuum; it is valued against its peers. To find the peers, you need a map. That map is the sector.

A sector is a "these move together" bucket

A sector groups companies that share the same basic economics — similar customers, similar cost structures, similar things that help or hurt them. When oil prices jump, energy companies tend to move as a group. When interest rates rise, banks tend to move as a group. Grouping isn't bureaucracy; it's a recognition that these businesses answer to the same forces.

Two words you'll hear used loosely:

• Sector — the broad bucket (e.g. Health Care, Financials, Information Technology).
• Industry — a finer slice inside it (inside Health Care: pharmaceuticals, medical devices, health insurers — all quite different businesses).

A useful habit: say the sector to set the weather, name the industry to describe the actual business.

Why an analyst reaches for the sector first

Three concrete jobs the map does:

• It finds comparables. "Is this stock cheap?" only means something against something. The sector gives you the natural comparison set — you judge a supermarket against other supermarkets, not against a chipmaker.
• It separates company news from sector news. When your company drops 4% and every other retailer drops 4% too, the story is the sector, not the company. (You met this exact instinct in Foundations: with the market or against it.)
• It organizes the whole market. Split the market into ~11 buckets and you can ask which parts are leading, which are lagging, and why — the backbone of the rotation lessons later in this course.

A worked example

Say MegaMart (a big grocery chain) trades at a price 14 times its yearly earnings. On its own, "14" is just a number. Line up three other large grocers at 13, 15 and 16, and suddenly MegaMart is roughly middle-of-the-pack — ordinary. Line it up instead against enterprise-software firms at 40, 55 and 60 and it looks absurdly cheap — but that comparison is meaningless, because a grocer and a software firm are different animals. The sector tells you which line-up is the honest one.

Try it now

Here is what the classification actually looks like for one company, dated:

1. Read the sector and the industry. The first sets the weather, the second describes the actual business — say each out loud and notice how much more the second tells you.
2. Now two pairs of companies most people would call direct rivals: two retailers fighting for the same shopper, and two ride-hailing apps fighting for the same rider.

Do the sector and industry labels match within each pair? To check a rivalry of your own, open any company in the Terminal and read its profile there; this link starts on Open KO.US in the EODHD Terminal, and you can change the symbol to the pair you have in mind. 3. Note whether the market groups them the way you would. Sometimes the official label surprises you — a "tech" brand filed under Consumer, a ride-hailing app filed under Technology — and that mismatch is itself information. 4. Here is the comparison set the label is for, the largest US listings that carry Apple's industry label:

That list is what "compared to what?" means in practice, and it still needs cleaning: count how many distinct companies are in it, not how many rows. Keeping it to one market matters too. Across all exchanges, the top two rows on 8 September 2026 were Apple's Canadian depositary receipts, priced in Canadian dollars and ranked above every real peer, with two German listings of the same company behind them.

A note on what we do here. EODHD Academy teaches how markets work. Nothing here is a recommendation to buy, sell, or favour any sector or company — tickers are illustrations only. We observe and compare; we do not predict or prescribe.