What Are GICS Codes? | GICS Sectors, Structure, and GICS vs NAICS & SIC
What are GICS codes? The Global Industry Classification Standard (GICS) is a global taxonomy for classifying public companies by their principal business activity. It was developed by MSCI and S&P Dow Jones Indices and is widely used for sector benchmarking, portfolio construction, performance attribution, and equity research.
GICS is built for investment analysis, not operational business databases. That distinction matters. If you are comparing public companies and benchmark sectors, GICS is usually the right framework. If you are segmenting companies for sales, marketing, CRM, or business data operations, NAICS and SIC are usually the more practical standards.
Why GICS Exists
Investment teams need a common way to group public companies so peers, sector exposures, and benchmark comparisons are consistent across markets. Without a shared taxonomy, the same company can be classified differently by different platforms, which creates noise in reporting, attribution, and risk analysis.
Key idea: GICS is designed to balance global consistency with enough detail to let analysts move from broad sector views down to narrow sub-industry peer sets.
GICS Hierarchy and Code Format
GICS uses a four-level hierarchy: Sector, Industry Group, Industry, and Sub-Industry. The full code is an 8-digit identifier, and each additional pair of digits adds more specificity.
Level 1
Sector
XX (2 digits)
Level 2
Industry Group
XXXX (4 digits)
Level 3
Industry
XXXXXX (6 digits)
Level 4
Sub-Industry
XXXXXXXX (8 digits)
How to read it: each added pair of digits narrows the classification. Analysts can roll up to sector exposure or drill down to sub-industry peer sets for valuation, screening, and attribution work.
What drill-down enables in practice
- Sector level: asset allocation, diversification review, and broad risk exposure
- Industry group and industry level: thematic research, competitor sets, and factor analysis
- Sub-industry level: narrow peer comparisons for valuation and performance attribution
The 11 GICS Sectors
At the top level, GICS contains 11 sectors. These are the broad categories most commonly used in portfolio reporting, benchmark construction, ETF design, and sector rotation analysis.
| Sector | Representative coverage |
|---|---|
| Communication Services | Telecom, media, interactive media, and communication platforms |
| Consumer Discretionary | Non-essential goods and services such as autos, retail, and leisure |
| Consumer Staples | Essential products such as food, beverages, and household or personal products |
| Energy | Oil, gas, consumable fuels, and energy equipment and services |
| Financials | Banks, insurance, capital markets, and diversified financial services |
| Health Care | Providers, equipment, supplies, biotechnology, and pharmaceuticals |
| Industrials | Capital goods, transportation, and commercial or professional services |
| Information Technology | Software, hardware, semiconductors, and IT services |
| Materials | Chemicals, metals and mining, construction materials, packaging, and forest products |
| Real Estate | REITs and real estate management and development |
| Utilities | Electric, gas, water utilities, and related utility operations |
How GICS Classification Works
GICS is designed to place each company in the category that best reflects its principal business activity. That supports consistent sector benchmarking and peer comparison across markets. Classifications can be reviewed when companies materially change through acquisitions, divestitures, restructurings, or major shifts in revenue mix.
What principal business activity means
- One primary placement: a company is generally assigned one main GICS classification for reporting and benchmarking
- Economic relevance: the goal is comparability for investors, not listing every activity a company performs
- Reasonable stability: classifications usually change when the business has materially changed
Where classification gets harder
- Conglomerates: multi-segment businesses may require best-fit judgment
- Converging industries: technology, media, and consumer platforms can blur boundaries
- Corporate actions: mergers, spin-offs, and business model shifts can trigger review events
Common Uses of GICS Codes
- Benchmarking and reporting: standardizing sector and industry exposure across portfolios and markets
- Portfolio construction: managing sector concentration and allocation constraints
- Performance attribution: separating sector allocation effects from security selection effects
- Peer analysis: improving valuation comps and fundamentals comparison by grouping more comparable companies
- Index and ETF design: building sector and industry indices with a consistent global framework
- Research and backtesting: analyzing sector rotation, factor behavior, and long-horizon trends
Reviews and Updates
GICS classifications are maintained through ongoing review, and the broader structure can be revised when the global economy evolves enough to justify meaningful change. When structural changes occur, MSCI and S&P Dow Jones Indices typically communicate methodology updates and implementation schedules so investors and index users can adjust benchmark history and reporting frameworks.
Analyst tip: if a long-horizon backtest shows sector drift, check whether your sample period crosses a major GICS structure change or a significant company reclassification event. Classification history can affect comparability even when company fundamentals appear stable.
GICS vs SIC and NAICS
The right classification system depends on the job. GICS is built for public equity analysis and benchmark reporting. NAICS and SIC are more commonly used for economic reporting, operational business databases, sales targeting, CRM segmentation, and market sizing.
| System | Primary use case | Common users |
|---|---|---|
| GICS | Portfolio management, public equity analysis, and sector benchmarking | Investment analysts, fund managers, and index providers |
| NAICS | Economic statistics, production-based market sizing, and government reporting | Researchers, B2B marketers, data teams, and government agencies |
| SIC | Legacy comparability, operational segmentation, and private-sector historical alignment | Sales operations, analysts, data teams, and compliance workflows |
Need to segment your own database? GICS is excellent for public-company investment analysis, but most B2B teams use NAICS or SIC for sales and marketing operations.
Append NAICS and SIC codes to your file here →
For operational standards context, see Industry Classification Systems Overview, What is a NAICS Code?, What is a SIC Code?, and SIC vs NAICS Codes.
Frequently Asked Questions
- Who created GICS?
GICS was developed by MSCI in collaboration with S&P Dow Jones Indices to provide a global framework for classifying public companies for investment analysis and benchmarking. - How is a GICS code structured?
GICS uses a four-level hierarchy. The full code is an 8-digit identifier: 2 digits for Sector, 4 for Industry Group, 6 for Industry, and 8 for Sub-Industry. - Is GICS the same as NAICS or SIC?
No. GICS is designed for public equity analysis and benchmarking. NAICS and SIC are industry classification standards more commonly used for economic reporting and operational business segmentation. - Why might a company’s GICS classification change?
Reclassifications can occur after major business model shifts, acquisitions or divestitures, material revenue mix changes, or broader structural taxonomy updates. - How do I find a company’s GICS code?
GICS classifications are commonly available through MSCI resources and many financial market data platforms that publish sector and industry mappings based on GICS.