Free company data APIs: coverage matrix
Every endpoint below was live-probed on 2026-07-29 — status is what the server actually answered, not what its documentation promises.
An open company-data source is a registry or filing system that serves official records over an API without a license fee. This page tracks every one in our catalog with a working recipe: what it accepts, what it returns, what it costs to call, and whether it answered today.
What each open source returns
10 sources with runnable recipes; 9 answered on the last probe run. «Query by» is what you can search on — the field that decides whether a source fits your join at all.
| Source | Coverage | Records | Auth | Query by | Returns | Last probe |
|---|---|---|---|---|---|---|
| GLEIF LEI records API | Global | every LEI ever issued worldwide | none | legal name, LEI code, registration filters | LEI, legal name, legal address, registration status, parent relationships | answered 200 |
| TMview global trademark search API | Global | national and international registers combined — 5,122 records match ACME across all offices | none | trademark name, brand name, company name (free text) | trademark name, IP office, applicant name, Nice class, status, application number, registration number, dates | answered 200 |
| UK Companies House API | United Kingdom | 5,000,000+ companies, according to Companies House statistics | free key | company number, OE number (Register of Overseas Entities) | company profile, officers, beneficial owners (PSC >25%), registered office address | answered 401 |
| SEC EDGAR full-text search API | United States (federal) | all EDGAR filings since 2001 | none | company name (free text), filing form type | CIK, filing form, filing date, entity name | answered 200 |
| SEC EDGAR submissions API | United States (federal) | roughly 800,000 filing entities | none | CIK (10-digit filer identifier) | company name, SIC industry code, tickers, recent filings list | answered 200 |
| USPTO trademark full-text search API | United States (federal) | the full federal trademark register — 649 records match the wordmark ACME alone | none | wordmark, owner name, serial number, registration number, goods and services text | wordmark, owner name, alive status, serial number, registration number, international class, goods and services | answered 200 |
| Business Entities in Colorado dataset | United States — Colorado | 3,066,630 | none | address, place, entity record ID | company name, dates, owner record, economy fields | answered 200 |
| Connecticut Business Registry — Business Master | United States — Connecticut | 1,280,795 | none | company name, address, place, entity record ID | company name, dates, owner record, economy fields | answered 200 |
| New York Active Corporations dataset | United States — New York | 4,228,686 | none | company name, address, city, county, place, postal code, record ID, state | owner record, company name, economy fields | answered 200 |
| Oregon Active Businesses dataset | United States — Oregon | 1,561,616 | none | company name, address, city, date range, place, postal code, record ID, state | registration and economy fields | not answering (no route) |
Guides
- Apollo.io open source alternative — prospecting data from public records — Which free and open sources replace Apollo's company database, a live Form D prospecting example with 143 real filings, and where outreach tooling honestly stays paid.
- California business entity search — free lookup and why there is no open API — How to search the California business register, why the public search API is blocked to programmatic clients, and the four routes that actually work — verified by live probe.
- Free Clearbit alternative — company enrichment from open data — Which free registries and APIs replace each Clearbit enrichment function, what they cover, and where open data honestly falls short.
- Colorado business entity search — free lookup and open API — How to search the Colorado business register for free, what each status means, and the name-field trap that breaks 56% of exact matches — with live counts from the state API.
- Company data API — free and open routes to company records — Which free APIs return company records, what each one covers, and the matching traps that break naive lookups — with live counts and unedited samples.
- Connecticut business entity search — free lookup and open API — How to search the Connecticut business register for free, including the diversity-ownership flags on every record that no other state publishes — with live counts from the state API.
- Free Crunchbase API alternative — funding data from SEC filings — How SEC Form D and EDGAR replace Crunchbase funding data through free APIs — with a live query returning 143 real filings, a field map, and where editorial data still wins.
- Free Dun & Bradstreet alternative — open identifiers instead of DUNS — How the free GLEIF LEI register replaces DUNS lookups — with a live entity-resolution example, a DUNS-vs-LEI comparison table, and where credit scoring honestly stays paid.
- Free trademark search API — USPTO and global registers — How to search US and international trademarks by name or owner through free APIs — USPTO full-text search and TMview, with working queries and honest limits.
- Hunter.io open source alternative — email intelligence from open infrastructure — Which free DNS, registry, and profile sources replace parts of Hunter.io — a three-layer verification funnel with live examples, and why the address database itself stays paid.
- New York business entity search — free lookup and open API — How to search the New York corporation register for free, what each field means, and the matching traps — with live counts and unedited records from the state's own API.
- SEC EDGAR API — free company filings and financials guide — How to resolve any US public company to its CIK and pull filings, profiles, and XBRL financials from SEC EDGAR without an API key — with live responses, an endpoint matrix, and the rate-limit gotchas that cause most 403s.
- EDGAR full-text search API — query every SEC filing for free — How the SEC EDGAR full-text search API works, its undocumented aggregations and its hard 10,000-document ceiling, with live queries and unedited results.
- SEC Form D search — track private fundraising for free — How to search SEC Form D filings by company, date, or sector through the free EDGAR full-text API — what a Form D discloses and what it honestly doesn't.
- UK Companies House API — free company registry data guide — How to pull UK company profiles, directors, and beneficial owners from the free Companies House API, with endpoints, auth, and rate limits.
- Free US company registry APIs — state-by-state guide — Which US states offer free business registry APIs, how many records each holds, live probe status per state, and how to query them without an API key.
- Free ZoomInfo alternative — B2B company data from open sources — Which free registries replace each ZoomInfo data layer, a live-probed map of 13M+ open records, worked examples with real API responses, and the honest boundary where contact data stays paid.
Source cards
- Business Entities in Colorado dataset — free access card — Endpoint, auth, query keys, limits, and live probe status for the Colorado business registry, as verified in the Aidenix Atlas catalog.
- Connecticut Business Registry — Business Master — free access card — Endpoint, auth, query keys, limits, and live probe status for the Connecticut business registry, as verified in the Aidenix Atlas catalog.
- GLEIF LEI records API — free access card — Endpoint, auth, query keys, limits, and live probe status for the global LEI register, as verified in the Aidenix Atlas catalog.
- New York Active Corporations dataset — free access card — Endpoint, auth, query keys, limits, and live probe status for the NY corporations registry, as verified in the Aidenix Atlas catalog.
- Oregon Active Businesses dataset — free access card — Endpoint, auth, query keys, limits, and live probe status for the Oregon business registry, as verified in the Aidenix Atlas catalog.
- SEC EDGAR full-text search API — free access card — Endpoint, auth, query keys, limits, and live probe status for the EDGAR name-to-CIK resolver, as verified in the Aidenix Atlas catalog.
- SEC EDGAR submissions API — free access card — Endpoint, auth, query keys, limits, and live probe status for the EDGAR issuer-profile endpoint, as verified in the Aidenix Atlas catalog.
- TMview global trademark search API — free access card — Endpoint, auth, query keys, limits, and live probe status for the TMview multi-register search, as verified in the Aidenix Atlas catalog.
- UK Companies House API — free access card — Endpoint, auth, query keys, limits, and live probe status for the UK company register API, as verified in the Aidenix Atlas catalog.
- USPTO trademark full-text search API — free access card — Endpoint, auth, query keys, limits, and live probe status for the USPTO trademark search, as verified in the Aidenix Atlas catalog.
Need this at scale? The Aidenix Atlas catalog maps
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Find these guides useful? Add Aidenix as a preferred source on Google — our pages will surface in your AI Overviews.