The register
The register lists FreeAgent Central Ltd in Edinburgh as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Freeagent Central Ltd, number SC316774, incorporated 2007: 19 years of filings behind the name. The registered office is at One Edinburgh Quay, 133 Fountainbridge, Edinburgh, EH3 9QG, EH3 9QG. Its filed activity puts it in it, software and media. It has traded under other names before, including Free Agent Central Limited.
A licence says an organisation may sponsor; it does not say it is hiring today. The way to find out is the same as for any employer: the careers page, the job boards, and a direct approach with a UK-style CV that says early that sponsorship would be needed.