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Use GET /api/v1/companies when the question is who is this company? (NVDA, nvidia.com, a CIK, or a name). This is not article search — after you have a ticker, use Entity Search for mentioning articles. Free, no auth required. Empty matches return 200 with items: []. Unexpected lookup failures return 500.

List

At least one of ticker, domain, qid, cik, or name is required. When more than one is given, lookup uses qid > ticker > domain > cik > name to find candidates; the remaining identifiers must also match.

Response

Present name plus identifiers.ticker / domain to users — do not lead with raw ids.

One company

GET /api/v1/companies/{companyId} returns the same profile object as a list item. Use the id from the list route. Unknown ids and ids that are not companies return 404.