SEC codes are the two identifiers the Securities and Exchange Commission uses to organize its public filings database: the Central Index Key (CIK), which identifies who is filing, and the Standard Industrial Classification (SIC) code, which categorizes the filer’s industry. Every company, fund, and individual required to file with the SEC gets a CIK. Every corporate filer is also tagged with a four-digit SIC code. Together they make EDGAR searchable by entity and by industry.
The Central Index Key
The CIK is a unique number the SEC assigns to every entity or individual that submits filings to the agency.1U.S. Securities and Exchange Commission. Look Up a Central Index Key (CIK) Number It covers public companies, mutual funds, foreign governments, and corporate insiders who file ownership reports. The number is purely numerical and is represented 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
The CIK works like a permanent account number. It never changes and never expires, even if the company changes its name, relocates, or merges with another entity.3U.S. Securities and Exchange Commission. Understand and Utilize EDGAR CIK and CIK Confirmation Code (CCC) That permanence is what makes it so useful. One number pulls up a company’s entire disclosure history, from its first registration through every annual report, quarterly filing, and material event notice since.
The Standard Industrial Classification Code
If the CIK tells you who filed a document, the SIC code tells you what kind of business they run. It is a four-digit number assigned to each company that indicates its primary line of business. The SEC uses SIC codes to group similar companies for comparative analysis and to assign review responsibility within the Division of Corporation Finance.4U.S. Securities and Exchange Commission. Standard Industrial Classification (SIC) Code List
The four digits are organized from broad to specific. The first two digits mark the major industry group — code 28, for example, covers Chemicals and Allied Products. The first three narrow that down to an industry group, such as 357 for Computer and Office Equipment. All four digits pinpoint the specific industry: 3571 designates Electronic Computers.4U.S. Securities and Exchange Commission. Standard Industrial Classification (SIC) Code List
A company’s SIC code is generally determined by whatever product or service generates the largest share of its revenue. For a single-business company that’s a simple call. Diversified companies get only one four-digit code regardless of how many segments they operate, so when no segment clearly dominates, the company typically picks the code that best reflects the combined picture of its revenue and earnings.
How a Company Gets a CIK
Any entity or individual required to file with the SEC must first apply for EDGAR access by submitting Form ID.5eCFR. 17 CFR 269.7 – Form ID, Application for EDGAR Access The process runs in two parts. You complete and submit Form ID electronically through the EDGAR Filer Management website, then upload a notarized copy of the completed form signed by an authorized individual.6SEC EDGAR Filer Management. Form ID Instructions The notarization exists to verify the identity of the person requesting access and prevent unauthorized filings.
Starting in March 2025, the SEC transitioned EDGAR to a new system called EDGAR Next. All filers must now use Login.gov credentials with multifactor authentication to access the EDGAR Filer Management website.7U.S. Securities and Exchange Commission. Transition to EDGAR Next Begins March 24, 2025 The older passphrase and password system has been discontinued. Once your Form ID is approved, EDGAR assigns your CIK along with a CIK Confirmation Code (CCC), which acts as a password-like credential used alongside the CIK to make filings.3U.S. Securities and Exchange Commission. Understand and Utilize EDGAR CIK and CIK Confirmation Code (CCC)
When Individuals Need Their Own CIK
It isn’t only companies that need CIK numbers. Corporate officers, directors, and anyone who beneficially owns more than 10% of a public company’s equity securities must file ownership reports with the SEC on Forms 3, 4, and 5. Each of those individuals needs a personal CIK to make those filings. Form 3, the initial ownership disclosure, is due within 10 days of becoming an insider, so anyone stepping into a board seat or executive role at a public company needs to have EDGAR access sorted out quickly.
This catches people off guard more often than you’d expect. A newly appointed CFO or board member who hasn’t dealt with SEC filings before may not realize they personally need to register with EDGAR. Missing the 10-day window for Form 3 is a compliance violation, and late filings are publicly disclosed in the company’s annual proxy statement.
How SIC Codes Get Assigned and Checked
The company initially selects its own SIC code when it registers with the SEC, but the agency doesn’t simply rubber-stamp that choice. SEC staff can challenge or change a code if the company’s description of its operations doesn’t match the industry it claims. A software company that classifies itself under a manufacturing code, for example, would likely get flagged during review.
The code also affects how the Division of Corporation Finance routes a filing internally, so an inaccurate code can land your disclosures with reviewers less familiar with your actual industry.4U.S. Securities and Exchange Commission. Standard Industrial Classification (SIC) Code List If a company significantly shifts its primary business, it should update its SIC code to stay grouped with the right competitive set. Deliberately choosing an inaccurate classification could be treated as a materially misleading statement in a filing. Under the Securities Exchange Act, the SEC can impose civil penalties in administrative proceedings when a person makes false or misleading statements in required reports, with penalties tiered by severity and the highest tier reserved for conduct involving fraud or reckless disregard that causes substantial losses to others.8Office of the Law Revision Counsel. 15 US Code 78u-2 – Civil Remedies in Administrative Proceedings
Why the SEC Still Uses SIC Instead of NAICS
Most federal agencies stopped using SIC codes in the late 1990s and switched to the North American Industry Classification System (NAICS), which the Office of Management and Budget adopted in 1997.9U.S. Census Bureau. North American Industry Classification System – NAICS NAICS uses a six-digit structure that allows finer distinctions between related industries, particularly in service and technology sectors that barely existed when SIC codes were designed.10U.S. Bureau of Economic Analysis (BEA). What Is the Difference Between 2, 3, 4, 5, and 6-Digit NAICS Codes?
The SEC still uses SIC codes for its filings database. Decades of filings are classified that way, and switching to NAICS would create a break in the data analysts rely on to compare companies across long time periods. If you’re researching a company through the Census Bureau or the Small Business Administration, you’ll encounter NAICS codes instead. On EDGAR, you want the SIC code.
Looking Up a Company’s Codes
The fastest way to find a company’s CIK and SIC code is through the SEC’s EDGAR search page at sec.gov/search-filings.11U.S. Securities and Exchange Commission. Search Filings The Company Search tool lets you enter a company’s legal name or ticker symbol and returns a profile page displaying both codes near the top. That same profile page is the gateway to every filing the company has submitted.
EDGAR also provides a dedicated SIC code lookup page that lists every code alongside the SEC office responsible for reviewing filings in that category.4U.S. Securities and Exchange Commission. Standard Industrial Classification (SIC) Code List It’s useful when you already know the industry you want to research and need the correct four-digit code to filter results.
Using the Codes for Research
Once you have the codes, they become practical research tools. The CIK lets you filter EDGAR to show only one entity’s filings, which matters when a company has a common name or when you need to distinguish a parent from its subsidiaries. Searching by CIK eliminates ambiguity and pulls up every filing type the entity has ever submitted.12SEC.gov. About EDGAR System
The SIC code works in the opposite direction. Instead of narrowing to one company, it broadens your view across an industry. You can pull filings from every company in a specific four-digit category, or zoom out to the two-digit major group to capture a wider peer set. Combining both codes lets you retrieve, for example, all annual reports from every company in a particular industry group — the standard approach for building peer performance benchmarks.