Stock and Company Identifiers API - Finnworlds

The Stock and Company Identifiers API provides developers with a unified, structured source of company identifiers and classifications. With a single API call, you can retrieve key identifiers such as ISIN, CUSIP, CIK, EIN, and LEI alongside sector, industry, SIC details, and a history of previous company names. It is possible to request data by a company ticker, ISIN, CUSIP and CIK.

The stock identifiers data is designed to simplify entity mapping and reduce resources spent on aggregating basic company and stock information. This allows clean data pipelines and power accurate search.

The API is ideal for investment platforms, compliance and KYC workflows, research tools, CRMs, and enterprise data warehouses that require precise and consistent company identity data. With its global coverage, the stock and company identification API is a one-in-all tool to display company metadata worldwide.

Common Use Cases

– Mapping across ISIN, CUSIP, CIK, EIN, LEI for clean entity resolution
– Enriching portfolios, screeners, and research apps with standardized identifiers
– Compliance/KYC checks with authoritative company identity fields
– Keeping track of historical/previous company names for continuity

API Features

• Global Identifiers – ISIN, CUSIP, CIK, EIN, LEI, and series where available
• Classification – Sector, industry, and SIC code/name for business context
• Entity Metadata – Security item type (e.g., equity) and canonical company name
• Corporate History – Previous names with effective dates for change tracking
• Date & Consistency – Timestamped, normalized output designed for integration

Access today by getting your API key on the Finnworlds website.
Looking for academic or non-profit use? Send us an email to start the conversation.

How to access the data

• JSON rest API
• Excel CSV download
• PDF reports
• Email link

Documentation

Our documentation includes input parameters, output objects with descriptions. We also have SDKs for Javascript, JQuery, VueJS, Angular, JAVA, PHP, NodeJS, Python, Go, Ruby, C#, R, Strest, Rust, Swift and Scala.

Examples

https://api.finnworlds.com/api/v1/identifiers?key=APIKEY&ticker=AAPL

{
    "status": {
        "code": 200,
        "message": "OK",
        "details": ""
    },
    "result": {
        "basics": {
            "company": "Apple Inc.",
            "ticker": "AAPL",
            "isin": "US0378331005"
        },
        "output": {
            "name": "Apple Inc.",
            "ticker": "AAPL",
            "cik": "320193",
            "isin": "US0378331005",
            "cusip": "037833100",
            "ein_employer_id": "942404110",
            "lei": "HWUPKR0MPOU8FGXBT394",
            "series_id": "",
            "item_type": "equity",
            "sector": "Technology",
            "industry": "Consumer Electronics",
            "sic_code": "3571",
            "sic_name": "Electronic Computers",
            "previous_names": [
                {
                    "name": "APPLE INC",
                    "from": "2007-01-10"
                },
                {
                    "name": "APPLE COMPUTER INC/ FA",
                    "from": "1997-07-28"
                },
                {
                    "name": "APPLE COMPUTER INC",
                    "from": "1994-01-26"
                }
            ]
        }
    }
}

Customer Support

Need help, have questions? Get in touch with Support.

Legal

Use of the Finnworlds website, services like API and database are subject to the Finnworlds Terms & Conditions.