The register
The register lists Hidden Agency Ltd in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Hidden Agency Ltd is the registered name (Companies House number 07037497), a private limited company on the register since 2009. The registered office is at 11 Sunnyhill House 3-7 Sunnyhill Road, London, SW16 2UG, SW16 2UG. Its filed activity puts it in it, software and media.
Holding a licence is the expensive, slow part done. For Hidden Agency Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.