The 11 sectors that make up the stock market.
Stocks are grouped into 11 industry sectors — categories that respond to different economic forces in different ways. Knowing the sectors matters for one big reason: diversification. Owning one stock from each sector is very different from owning eleven tech stocks.
Why sectors matter for diversification
Different sectors respond to economic cycles differently. When interest rates rise, banks often benefit while real estate often suffers. When the economy weakens, consumer staples (the things people always buy) hold up better than consumer discretionary (the things people buy when feeling flush).
Owning stocks across multiple sectors smooths out your portfolio's ride. If technology has a bad year, healthcare or energy might offset it. This is why most index funds (like an S&P 500 fund) spread your money across all 11 sectors automatically — you get instant sector diversification without thinking about it.
A common trap: a portfolio that looks diversified because it has 15 stocks but actually concentrates in one or two sectors. Apple, Microsoft, Nvidia, Google, Meta, and Amazon are six different companies — but all in tech-adjacent sectors. If tech tanks, all six tank together.
The 11 sectors and example companies
Technology
Software, semiconductors, hardware, internet services. Often the largest sector by market cap.
Healthcare
Pharmaceuticals, medical devices, hospitals, health insurers, biotech.
Financials
Banks, insurance, asset managers, payment processors, exchanges.
Consumer Discretionary
Things people buy when they have extra money — cars, restaurants, apparel, e-commerce.
Consumer Staples
Things people buy in any economy — food, beverages, household products.
Industrials
Manufacturing, construction, defense, transportation, machinery.
Energy
Oil, gas, refining, energy equipment. Tied closely to commodity prices.
Materials
Chemicals, metals, mining, paper, packaging. The raw inputs to making things.
Communication Services
Telecom, media, entertainment, social platforms. Reorganized in 2018.
Utilities
Electric, gas, water utilities. Regulated, slow-growth, often higher dividends.
Real Estate
Property owners and managers, mostly REITs. Separate sector since 2016.
Can you spot the sector?
Identify which sector each company belongs to. No signup, no scoring history — just a quick check of what stuck.
Which sector?
Apple
iPhones, Macs, App Store, services