What is the biggest sector in the S&P 500?

Information Technology, at roughly a third of the index. The exact weight changes with prices; the top five tech companies alone make up a large share of it.

Which sectors do well in a recession?

Defensive sectors: Consumer Staples, Utilities and Health Care. Demand for groceries, electricity and medicine holds up when spending on cars and travel falls.

Is Amazon a tech stock?

Under GICS, Amazon is classified as Consumer Discretionary because retail is its main business, even though its cloud division is a technology giant. Alphabet and Meta sit in Communication Services, not Technology.

Stock Market Sectors Explained: All 11 GICS Sectors

Market reports say "tech led the rally" or "energy lagged". Those labels come from the Global Industry Classification Standard, GICS, which sorts every public company into one of 11 sectors based on its main line of business.

Knowing the sectors turns a wall of tickers into a map. It also explains why some stocks rise together, why your portfolio might be less diversified than it looks, and what analysts mean by rotation.

The 11 sectors

Information Technology (Apple, Microsoft, Nvidia), Health Care (Johnson & Johnson, UnitedHealth), Financials (JPMorgan, Visa), Consumer Discretionary (Amazon, Tesla, Home Depot), Communication Services (Alphabet, Meta, Netflix) and Industrials (Caterpillar, Boeing) are the six largest by weight in the S&P 500.

Consumer Staples (Procter & Gamble, Walmart), Energy (Exxon, Chevron), Utilities (NextEra, Duke), Real Estate (Prologis, American Tower) and Materials (Linde, Freeport-McMoRan) round out the eleven.

Technology alone is around a third of the S&P 500, so an index fund is far more concentrated in tech than its 500-stock label suggests.

Cyclical vs. defensive

Cyclical sectors rise and fall with the economy: Consumer Discretionary, Industrials, Financials, Materials and Energy. When growth accelerates they lead; in recessions they fall hardest.

Defensive sectors sell things people buy regardless: Consumer Staples, Health Care and Utilities. They lag in booms and hold up in downturns, and they tend to pay steady dividends.

Technology and Communication Services behave like growth sectors: sensitive to interest rates and to expectations more than to the current economy.

Sector rotation

Money flows between sectors as the outlook changes. Early in a recovery, Financials and Industrials lead. Late in the cycle, Energy and Materials shine as commodity prices rise. When recession fears build, investors rotate into Staples, Utilities and Health Care.

Our daily market analysis tracks which sectors are leading and lagging, because a rotation often shows up in sector performance before it shows up in the headline index.

Using sectors in your portfolio

Check your sector weights. Owning Apple, Microsoft, Nvidia and an S&P 500 fund gives you a heavy tech tilt, not diversification. Sector ETFs, such as XLK for technology or XLE for energy, let you tilt or rebalance deliberately.

Sectors also anchor comparisons. A P/E of 30 is ordinary in tech and alarming in utilities. Always compare a company to its sector peers before calling it cheap or expensive.

Stock Market Sectors Explained: The 11 Groups Every Stock Belongs To