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The origination glossary

SIC

Standard Industrial Classification, an industry coding system still encountered in company records and legacy datasets.

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Definition

SIC means Standard Industrial Classification. Researchers encounter it in legacy datasets, company profiles, and some current records. A code identifies a classification under a particular system; it does not provide a complete description of operations. The jurisdiction and version matter because similarly named classification systems are not automatically interchangeable.

SIC and NAICS codes should not be substituted by changing a column heading. A correspondence between classifications can be approximate or split across several categories. A company may also operate beyond its reported principal activity. The practical question is whether the source's classification helps discover candidates, not whether the label alone proves they satisfy the investment mandate. Preserve the original code and its source when adding a mapped classification.

In origination work

Keep source classifications in distinct fields with the relevant system and edition. Use documented correspondences when joining datasets and inspect ambiguous mappings rather than allowing them to decide eligibility. A capability screen should rely on what the business actually does, supported by retained evidence. If two providers assign different codes, record the disagreement and investigate the activity, entity scope, and dates. Classification disagreement is not itself proof that either company identity is wrong or that the business has changed ownership.

Where SIC codes still appear

The Standard Industrial Classification system was developed in the 1930s and was replaced by NAICS for most United States statistical purposes, but SIC codes remain in use. The Securities and Exchange Commission assigns a four-digit SIC code to each filer, and it publishes the list with the office responsible for reviewing filings of that type. Many commercial databases and some state records also retain SIC codes.

The Occupational Safety and Health Administration maintains a manual of SIC codes for its own uses, and some regulatory datasets still key on SIC for historical continuity. Anyone working with older data, with EDGAR or with mixed commercial datasets will encounter them, so being able to read and convert them is a basic research skill.

Converting SIC to NAICS

The Census Bureau publishes concordances between the two systems, but the mapping is many-to-many: a single SIC code may spread across several NAICS codes, and several SIC codes may merge into one NAICS code. Industries that appear in NAICS but had no SIC equivalent, such as many information and services categories, have no clean backward mapping.

Because of this, a conversion is a hypothesis to be tested against the business description. A practical approach is to take every NAICS code that the concordance associates with the SIC code, review a sample of businesses under each, and select those whose real activities match the mandate. Record the choice and the reasoning, in case the search must be repeated.

Cautions when using SIC for screening

A filer's SIC code reflects the registrant's own selection and the SEC's assignment, and may describe a holding company's historical business instead of its current operations. A company that changed strategy may keep an old code for years. Therefore the code is useful for narrowing a list of public companies but is not proof of activity.

For private businesses, a SIC code in a commercial database was assigned by the vendor, using its own method. Treat it as a vendor field, with the vendor's name and the retrieval date. If two vendors give different codes for the same company, that disagreement is itself informative: it usually means the business straddles categories and needs a closer look.

Related terms

  • NAICS — The North American Industry Classification System, a framework for classifying business establishments by economic activity.
  • Market map — A structured view of a defined market's participants, relationships, capabilities, and research coverage.
  • Provenance — The record of where information came from, how it was produced, and which activities contributed to it.

Further reading

Sources and further reading

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