US Stock Market Sectors Explained

Screening Concepts · July 2026

Every US-listed public company is classified into one of a small number of standard sectors, based on its primary business. Understanding these categories is useful for two practical reasons: it's how most screeners let you search by business type, and it's a quick way to reason about how a stock might behave relative to the broader economy.

The 11 sectors

The standard classification splits the entire market into 11 sectors:

• Technology — software, hardware, semiconductors, IT services
• Healthcare — pharmaceuticals, biotech, medical devices, health insurers
• Financial Services — banks, insurers, asset managers, exchanges
• Consumer Cyclical — retail, autos, travel, restaurants — spending that rises and falls with the economy
• Consumer Defensive — groceries, household products, beverages — spending that stays fairly steady regardless of the economy
• Industrials — aerospace, machinery, transportation, defense
• Energy — oil & gas exploration, refining, equipment & services
• Utilities — regulated electric, gas, and water providers
• Real Estate — REITs and real estate services
• Basic Materials — mining, chemicals, steel, building materials
• Communication Services — telecom, media, entertainment, internet platforms

Cyclical vs. defensive: the practical distinction

A useful lens for grouping these 11 sectors is cyclical versus defensive. Cyclical sectors — Consumer Cyclical, Industrials, Basic Materials, Energy, Financial Services, Real Estate — tend to track the broader economy fairly closely, doing well in expansions and struggling in downturns. Defensive sectors — Consumer Defensive, Healthcare, Utilities — tend to hold up more steadily, since demand for groceries, medicine, and electricity doesn't move much with the economic cycle.

Technology and Communication Services don't fit neatly into either bucket and are often treated as their own category, since their performance tends to be driven more by growth expectations and interest rates than by the immediate economic cycle.

Screening by sector

Sector is one of the most reliable ways to narrow a screen, since it's a small, fixed set of categories rather than a long list of granular sub-industries. With OmniScreener:

• "US technology stocks over $10B market cap"
• "Consumer defensive stocks paying a dividend"
• "Healthcare companies with positive earnings growth"

Industry-level requests (a specific business type within a sector, like "airlines" or "semiconductor equipment") work too, and get mapped to a more precise category when there's a confident match — otherwise the screen falls back to the broader sector rather than guessing.

This article is for educational purposes only and is not financial, investment, or trading advice. Nothing here is a recommendation to buy, sell, or hold any security. Always do your own research and consult a licensed financial advisor before making investment decisions.