The register
The register lists Zeller UK Limited 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).
Companies House lists it as Zeller UK Limited, number 15853687, incorporated 2024: 2 years of filings behind the name. Registered office: 5th Floor One New Change, London, EC4M 9AF, EC4M 9AF. By its SIC codes the business is in finance and insurance.
Holding a licence is the expensive, slow part done. For Zeller UK Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.