Industry
How NAICS codes appear in entity lookups and where they mislead
NAICS codes in entity lookups come from self-reported filings, so analysts should always check them against licenses, SEC SIC codes and real work.
What to take away
- Formation filings in most states collect no industry code, so a NAICS code in a registry result usually comes from a license agency or a vendor.
- Codes enter records four waystyped by a filer, clerk-assigned, vendor-appended, or copied from a retired manual edition.
- The U.S. Census Bureau maintains NAICS and revises it every five years, so a 2017 vendor file may carry a code that no longer exists.
- SEC filings use SIC, a four-digit system that predates NAICS and does not convert one to one.
- A code says where to look next. Licenses, federal filings and named customers decide what the company does.
How the six digits are built
NAICS is a six-digit set used by the United States, Canada and Mexico to group establishments by main economic activity. It replaced SIC in the United States from 1997.
Each digit narrows the category. The first two set the sector, the third the subsector, the fourth the industry group, and the last two the national industry. A hardware store with a counter sits under 444140. An online hardware seller sits under 459140.
NAICS six-digit structure
- 1-2Sector
- 3Subsector
- 4Industry group
- 5-6National industry
The unit is the establishment, not the company. A firm with a factory, a warehouse and a sales office can hold three codes in federal statistics. That detail explains most of the confusion analysts meet in entity lookups.
Which sources carry a NAICS field
| Source | Carries NAICS | Who assigns it |
|---|---|---|
| State business registry | No | Nobody. Any code shown is a vendor field. |
| State or local license record | Often | The applicant picks from a list. |
| IRS EIN application | Yes, one code | The applicant selects it. |
| Federal award or contract registry | Yes | The applicant or the agency. |
| Commercial data vendor profile | Yes | A model, an address match or a credit file. |
An empty field is not proof that no code exists. A missing code, a suppressed code and a code never collected look identical in a flat file, a problem set out in blank fields in a public data feed.
Coverage is uneven, so know which author you are reading. California's business programs hub shows how one state organizes entity filings, licensing and related records in one place.
Three checks that decide what a code means
- Pull the registry record. Note the code, its source field and the last update date. If no code appears, record "none" instead of a vendor number.
- Pull license records for each jurisdiction where the company operates. A contractor license, a food permit or a board registration names the regulated activity and the agency behind it.
- Read the company's own description of products, customers and locations. Compare it with the code, and log agreement, partial agreement or conflict with the date of each finding.
Two sources that agree may come from one vendor feed. Three independent sources are the minimum, and a compiled profile stays a set of claims from different authors, the stance argued in reading secretary of state search data.
Five-step code verification
- Pull registry record and note code source
- Pull state and local license records
- Pull federal filings where they exist
- Read company website descriptions
- Compare code with licenses and website
How a code lands in a record
Four paths account for nearly every code you will see.
- A filer types a code into a state or local licensing form, often choosing from a dropdown offering broad sectors only.
- A state agency assigns a code for its own reporting, then publishes it in a bulk file.
- A vendor appends a code using address matching, a model or a purchased credit file.
- A federal form, such as the EIN application, captures a code that later flows into third-party products.
Each path has a different error rate. A clerk-coded record reflects a form. A vendor-coded record reflects a model. Neither is the company describing its own work.
Revisions arrive on a five-year cycle tied to the economic census. The 2022 edition moved several retail and information categories, and retirement is rarely clean in private databases.
When a mismatch is a red flag
Most mismatches are noise. A code one revision behind, a code describing a parent while the entity runs a division, and a code left from a former product line are ordinary.
Name changes and code changes often travel together, so an older profile in business name search data can look wrong for no bad reason.
A mismatch earns attention when it contradicts a regulated activity. If a lender file calls the borrower a staffing company while the state license says money transmitter, the license governs.
It matters too when eligibility depends on it. Contracting set-asides, small business programs and some state tax treatments use size standards tied to industry codes.
A pattern matters most. Several related entities at one address, sharing one agent and one implausible code, point to a structure worth examining.
Example: one stale code, one accurate one
A Nevada entity registered in 2019 carries a code for software publishing. Its state contractor license, issued in 2021, covers electrical work. Its website advertises data center fit-out and names three contractors as clients. The code is stale, not fraudulent.
A California plumbing company formed in 2016 shows 238220. Its contractor license covers plumbing, and its site lists the license number and service area. Here the code, the license and the site agree, so the code can be used as written.
Both examples rest on matching a claim to the source that issued it, the habit behind the seven verification gates used for name checks.
SIC at the SEC is not a NAICS source
The SEC classifies registrants with the Standard Industrial Classification, a four-digit system that predates NAICS. Companies report a SIC code on the cover page of many filings, and the SEC SIC code list explains each number.
To see what a company claimed, open its latest annual report through SEC search filings and compare the cover page code with the business section.
A crosswalk between SIC and NAICS returns a range of candidates, not one answer, so treat any converted number as a guess.
