GICS (Global Industry Classification Standard) are broken down into 4 tiers:
Sub-Industry (most granular)
Industry
Group
Sector
The GICS classification system consists of 66 industries. They are:
Energy Equipment & Services
Beverages
Oil, Gas & Consumable Fuels
Food Products
Chemicals
Tobacco
Construction Materials
Household Products
Containers & Packaging
Personal Products
Metals & Mining
Health Care Equipment & Supplies
Paper & Forest Products
Health Care Providers & Services
Aerospace & Defense
Health Care Technology
Building Products
Biotech
Construction & Engineering
Pharmaceuticals
Electrical Equipment
Life Sciences Tools & Services
Industrial Conglomerate
Commercial Banks
Machinery
Thrifts & Mortgage Finance
Trading Companies & Distributors
Diversified Financial Services
Commercial Services & Supplies
Consumer Finance
Air Freight & Logistics
Capital Markets
Airlines
Insurance
Marine
REITs
Road & Rail
Real Estate Management & Development
Transportation Infrastructure
Internet Software & Services
Auto Components
IT Services
Automobiles
Software
Household Durables
Communications Equipment
Leisure Equipment & Products
Computers & Peripherals
Textiles, Apparel & Luxury Goods
Electronic Equipment & Instruments
Hotels, Restaurants & Leisure
Office Electronics
Diversified Consumer Services
Semiconductors & Semiconductor Equipment
Media
Diversified Telecom Services
Distributors
Wireless Telecom Services
Internet & Catalog Retail
Electric Utilities
Multiline Retail
Gas Utilities
Specialty Retail
Multi-Utilities
Food & Staples Retailing
Water Utilities