---
ref: tool:coresignal/search-companies
name: Search companies
company: company:coresignal
workflows: []
access: [api]
tags: [capability:find-prospects, category:data-provider, has:api]
docs: https://docs.coresignal.com/company-api/base-company-api/endpoints/search-filters
updated: 2026-09-29
---

# Search companies

Returns company IDs matching filters such as industry, size, location and technology stack.

Note: Collect each company's full record with the matching collect endpoint, by its returned company ID.

## Set up

Use the first option your agent supports.

### API (official)

- Base URL: https://api.coresignal.com/cdapi/v2
- Endpoint: `POST /company_base/search/filter`
- Auth: send the header `apikey: $CORESIGNAL_API_KEY`
- Get a key: https://dashboard.coresignal.com
- Docs: https://docs.coresignal.com/api-introduction/apis-overview

Before anything else, confirm access with the cheapest read-only call, like a list or a search. Never send or change anything to test access.

## Rules

- Ask the user before anything that sends messages, costs money, or changes data, and say how many records it touches. One approval covers a batch the user has seen.
- Never print API keys.