The register
The register lists Twenty First Group Limited in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Its rating on the register is Worker (A rating).
At Companies House the business is Twenty First Group Limited (company number 08547537), a private limited company incorporated in 2013, 13 years ago. Registered office: 1st Floor 17-18 Hayward's Place, Clerkenwell, London, EC1R 0EQ, EC1R 0EQ. By its SIC codes the business is in business services. It has traded under other names before, including 21st Club Limited.
Holding a licence is the expensive, slow part done. For Twenty First Group Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.