The document compares several industry classification systems: ICB, GICS, TRBC, NAICS, IBBCS, and Michael Porter's "Five Forces". It shows how each system categorizes industries at different levels, from broad sectors down to narrow sub-industries. The IBBCS system provides the most granular breakdown with 19,000 individual industries.

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Industry
Classification
Systems
Basic
Unit
Top
Level
Level
2
Level
3
Level
4
Level
5
ICB
(FTSE)
Company
Industries
Super
Sectors
Sectors Subsectors
10 19 41 114
GICS
(S&P)
Company
Sectors
Industry
Groups
Industries
Sub-
Industries
11 24 68 157
TRBC
(Thomson)
Company
Economic
Sectors
Business
Sectors
Industry
Groups
Industries Activities
10 28 54 136 837
NAICS
(U.S. OMB)
Industry
Economic
Sectors
Economic
Subsectors
Industry
Groups
NAICS
Industry
National
Industry
24 99 311 699 1,057
IBBCS
(IBB)
Industry
Super
Sectors
Sectors Subsectors
Industry
Groups
Industries
19 130 550 2,750 19,000
Michael Porter
“Five Forces”
Industry Level
Industry
Precision
Scores
in
GREEN
Alternative views of:
the global economic pie.
Sources: company websites and/or Wikipedia.
Trade names belong to respective companies.