The SEC organizes its filings database with two codes: the Central Index Key, or CIK, which identifies the entity or person doing the filing, and the Standard Industrial Classification, or SIC, code, which tags that filer with a primary industry. Together, these SEC codes explained below are what let anyone search, sort, and pull disclosures from EDGAR, the agency’s public filing system.
What a CIK Is and Why It Matters
The CIK is a unique number the SEC assigns to every entity or individual that submits filings.1U.S. Securities and Exchange Commission. Look Up a Central Index Key (CIK) Number Public companies get one. So do mutual funds, foreign governments, and corporate insiders who file ownership reports. The number is purely numerical and appears as a ten-digit sequence, zero-padded on the left when used in EDGAR accession numbers and URLs.2U.S. Securities and Exchange Commission. Understand, Select and Set a Default Login CIK
Think of it as a permanent account number. The CIK never changes and never expires, even if the company changes its name, moves, or merges with another entity.3U.S. Securities and Exchange Commission. Understand and Utilize EDGAR CIK and CIK Confirmation Code (CCC) That permanence is the point. You can track a company’s entire disclosure history under one number, pulling up every annual report, quarterly filing, and material event notice going back to when it first registered.
The CIK also appears inside every filing’s accession number. The first ten digits of an accession number correspond to the login CIK of the filer who submitted it, creating a machine-readable link between each document and its source.2U.S. Securities and Exchange Commission. Understand, Select and Set a Default Login CIK Analysts writing scripts to pull filings from EDGAR rely on that stability to build datasets that span years or decades.
What an SIC Code Is
The SIC code sits alongside the CIK on every corporate filer’s EDGAR profile. It is a four-digit number that identifies the company’s primary line of business, and the SEC uses it both to group similar companies for comparison and to route filings to the right review team inside the Division of Corporation Finance.4U.S. Securities and Exchange Commission. Standard Industrial Classification (SIC) Code List
The four digits work hierarchically, moving from broad to specific:
- The first two digits are the Major Group. For example, 28 covers Chemicals and Allied Products.
- The first three digits are the Industry Group. Code 357 represents Computer and Office Equipment.
- All four digits give the specific Industry. Code 3571 designates Electronic Computers.4U.S. Securities and Exchange Commission. Standard Industrial Classification (SIC) Code List
A company’s SIC code is generally set by whatever product or service generates the largest share of its revenue. For a single-business company, the choice is obvious. Diversified companies face a harder call, because a conglomerate spanning manufacturing, financial services, and retail still gets only one four-digit code. When no single segment dominates, the company usually picks the code that best reflects its combined revenue and earnings.
The company chooses its own code when it registers, but the SEC does not simply accept it. Staff can challenge or change the classification if the description of operations doesn’t match the industry claimed. A software company that files itself under a manufacturing code would likely be flagged. If a business significantly shifts what it does, it should update its SIC code so it stays grouped with the right peers. Deliberately choosing an inaccurate classification could be treated as a materially misleading statement in a filing.5Office of the Law Revision Counsel. 15 US Code 78u-2 – Civil Remedies in Administrative Proceedings
SIC Codes vs. NAICS
One point of confusion worth clearing up: most federal agencies stopped using SIC codes in the late 1990s. The Office of Management and Budget adopted the North American Industry Classification System, or NAICS, in 1997 to replace SIC across the government.6U.S. Census Bureau. North American Industry Classification System – NAICS NAICS uses six digits and offers finer distinctions, particularly in service and technology sectors that barely existed when SIC was designed.7U.S. Bureau of Economic Analysis (BEA). What Is the Difference Between 2, 3, 4, 5, and 6-Digit NAICS Codes?
The SEC kept SIC anyway. Decades of filings are already classified under it, and switching would break the continuity that analysts depend on for long-horizon comparisons. So EDGAR stays on SIC even though the Census Bureau, the Small Business Administration, and most other federal sources use NAICS. If you research the same company through those agencies, expect a different code.
How to Look Up CIK and SIC Codes on EDGAR
The fastest lookup is through the SEC’s EDGAR search page at sec.gov/search-filings.8U.S. Securities and Exchange Commission. Search Filings Enter a company’s legal name or ticker symbol in Company Search, and the profile page returns both the CIK and the SIC code near the top. That page also serves as the entry point to every filing the company has ever submitted.9SEC.gov. About EDGAR System
EDGAR also publishes a full SIC code list that shows every four-digit code alongside the SEC office responsible for reviewing filings in that category.4U.S. Securities and Exchange Commission. Standard Industrial Classification (SIC) Code List That list is handy when you already know the industry you want to research and just need the right code to filter results.
Using the Codes for Research
The two codes let you cut EDGAR data in opposite directions. The CIK narrows everything to one entity, which matters when a company has a common name or when you need to separate a parent from its subsidiaries. Searching by CIK removes the ambiguity and pulls every filing type the entity has submitted.
The SIC code broadens the view. You can retrieve filings from every company in a single four-digit industry, or step back to the two-digit Major Group to capture a wider peer set. Combining the two lets you do things like pull annual reports from every company in one industry group and then drill into a specific filer, which is how peer performance benchmarks get built in practice.
When You Personally Need a CIK
CIKs are not just for companies. Corporate officers, directors, and anyone who beneficially owns more than 10% of a public company’s equity securities must file ownership reports on Forms 3, 4, and 5, and each of those people needs a personal CIK. Form 3, the initial ownership disclosure, is due within 10 days of becoming an insider. A newly appointed CFO or board member who has never dealt with SEC filings often doesn’t realize this. Missing that 10-day window is a compliance violation, and late filings are publicly disclosed in the company’s annual proxy statement.
To get a CIK, an entity or individual first applies for EDGAR access by submitting Form ID.10eCFR. 17 CFR 269.7 – Form ID, Application for EDGAR Access The form is completed electronically through the EDGAR Filer Management website, and a notarized copy signed by an authorized individual must be uploaded to verify identity.11SEC EDGAR Filer Management. Form ID Instructions
Since March 24, 2025, the SEC has transitioned EDGAR to a new system called EDGAR Next, which requires all filers to use Login.gov credentials with multifactor authentication to access the Filer Management website.12U.S. Securities and Exchange Commission. Transition to EDGAR Next Begins March 24, 2025 The older passphrase and password system has been discontinued. Once Form ID is approved, EDGAR assigns the CIK along with a CIK Confirmation Code, or CCC, which functions as a password-like credential used together with the CIK when submitting filings.3U.S. Securities and Exchange Commission. Understand and Utilize EDGAR CIK and CIK Confirmation Code (CCC)