I am using LeadMagic's "Enrich Company" enrichment, which returns the headcount, and I would like to know what their sources are.

The "Find Employee Headcount by Criteria" enrichment requires at least one role or one country filter to get employee count data. [documentation If you don't specify any criteria, the enrichment won't return results since it needs either a role filter or country filter to function properly. There are different versions of this enrichment - one uses People Data Labs [documentation and another uses Companies, People, and Jobs data. [documentation Both require some criteria to be specified to work.

And where does the "Find Employee Headcount by Criteria" enrichment get its results if no criteria are specified?

LeadMagic uses their Company Finder API to gather headcount data, but the specific data sources aren't detailed in our documentation. [documentation The integration pulls from LeadMagic's database using company social URLs (like LinkedIn profiles) to retrieve employee count information. [clay.com For the exact data sources behind LeadMagic's headcount numbers, you'd need to check directly with LeadMagic at leadmagic.io or their API docs at documentation