- North America
- Illinois
North America
Beta
Illinois
Company data from the Illinois business register, through the Topograph API.
Topograph reads Illinois Secretary of State, Department of Business Services and returns the company profile, legal representatives and other key persons of Illinois companies through one API.
What comes back for each datapoint and document, as on the coverage matrix.
Requests run in prefill mode (fast) or verification mode (the authoritative register answer).
Datapoints
- Company profileYes
- Legal representativesYes
- Other key personsYes
Documents
- Register extractNo
- Articles of associationNo
- FinancialsNo
- UBO extractNo
A company profile typically comes back from the register in 1 s in prefill mode and 1 s in verification mode.
These are typical observations, not a service-level commitment: set your timeouts well above them.
The registers this country’s data comes from. Secondary sources only enrich or check what the registers return.
Official Illinois state business entity register maintained by the Secretary of State, Department of Business Services. Covers ~3.5M entities (corporations, LLCs, not-for-profits, agricultural cooperatives). Responses are served from a daily full-snapshot of the statutory bulk distribution (Business Data Transparency Act, Public Act 102-0049, effective 2022-01-01): corporation and LLC master records, names, and managers/members. This distribution is published by the Secretary of State itself and carries the register's own status codes, so it is the authoritative source rather than a third-party copy; the Department mandates that it be published openly and daily, and prohibits automated querying of the public inquiry portal.
- GLEIF (Legal Entity Identifiers)Secondary
Global Legal Entity Identifier Foundation – Legal Entity Identifier reference data
Request a company by its ILSOS File Number as the id, with countryCode set to US-IL. Its format, validation rules and an example value are in the full reference.
The full reference covers how each datapoint is sourced and mapped, the vocabularies the API returns, the documents you can order and exact example responses. It is free with a Topograph account.
- Identifiers and formats2
- Search patterns3
- Quirks9
- Legal forms11
- Officer roles7
- Company statuses25
- Example responses3