Definition
NAICS is the North American Industry Classification System used to group business establishments by economic activity. It provides a common framework for finding and comparing statistical information. A classification describes an activity under a particular edition; it is not a complete account of a company's capabilities, ownership, customer mix, or suitability for acquisition.
A mandate rarely aligns perfectly with a classification boundary. Companies with similar services can appear under different codes, while one code can contain businesses that fail the mandate's capability test. Different establishments within a group can also have different activities. Record the classification edition and source, and distinguish a reported code from one inferred during research. Code similarity alone is insufficient to merge entities or declare them direct competitors.
In origination work
Use the applicable classification, including the 2022 edition where that is the dataset's basis, as a discovery aid. Write the actual service inclusion test independently and examine neighbouring categories for missed candidates. Confirm what a company does using evidence appropriate to the question. When comparing sources, check whether the unit is an establishment or an enterprise and whether editions differ. Keep a classification mismatch visible instead of forcing every relevant company into one convenient search category.
How NAICS works
The North American Industry Classification System assigns each establishment a numeric code based on its primary activity. The code is hierarchical: two digits for the sector, then longer codes for subsector, industry group, industry and national industry. It is revised periodically, so codes and definitions change between editions, and data published under one edition may need a concordance to compare with another.
Classification is by establishment and by primary activity. A company with several locations may have different codes at different locations, and a company engaged in two kinds of work is coded by the one that predominates by the agency's measure. Self-reported codes on registration forms may differ from the code a statistical agency assigns, and neither is a precise description of the whole business.
Practical limits in screening
NAICS codes are often too coarse. A single code can include businesses with very different customers, such as residential and commercial service providers, or different economics, such as installation and recurring maintenance. Using a code as the only filter returns false positives and false negatives. Combine it with words from the business's own description and with evidence about the services actually sold.
The SBA uses NAICS codes to set small-business size standards, defined by revenue or employees depending on the industry, which is why the code a business registers under can affect its eligibility for certain programmes. Government contractors register NAICS codes in the federal registration system, and those codes reflect the contractor's own selection. All of these are signals, and none is a verified description of what the business does.
Crosswalks and the older system
Many records still carry Standard Industrial Classification codes, an older four-digit system that the Securities and Exchange Commission continues to assign to filers. Converting between SIC and NAICS is not a clean one-to-one mapping; a single SIC code can map to several NAICS codes and the reverse. A crosswalk should be treated as a candidate list and checked against the business description.
Keep the code, the edition and the source of assignment together in the record. If a search relies on a code, store which edition was used, so that a re-run next year gives comparable results. For market sizing, use the same edition across the numerator and denominator, and note when sources use different ones.
Related terms
- SIC — Standard Industrial Classification, an industry coding system still encountered in company records and legacy datasets.
- Market map — A structured view of a defined market's participants, relationships, capabilities, and research coverage.
- Screening rubric — A defined set of questions, accepted answers, evidence requirements, and decision rules for assessing candidates.
Further reading
- Use codes without confusing them with a market
- SIC
- Market map
- Total addressable market
- Census County Business Patterns
- Article: mapping NAICS and SIC codes for screening
- Article: SBA size standards versus the lower middle market
Sources and further reading
- North American Industry Classification System (NAICS), U.S. Census Bureau. The classification every federal dataset keys on, and the first thing a market map has to get right.
- Economic Census: NAICS Codes & Understanding Industry Classification Systems, U.S. Census Bureau. How NAICS is built, how an establishment gets its code and why codes are assigned by activity.
- Size standards, U.S. Small Business Administration. How the SBA defines a small business by industry, using NAICS codes and either revenue or employees.
- Standard Industrial Classification (SIC) Code List, U.S. Securities and Exchange Commission. The four-digit SIC codes EDGAR still assigns to every registrant, with the office that reviews each.
- SAM.gov entity registration, U.S. General Services Administration. Any entity that wants federal money registers here, exposing legal name, address and NAICS codes.
To apply these distinctions to your own acquisition criteria, discuss your research brief or inspect the demo platform.