The register
The register lists Xtra 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).
Companies House lists it as Xtra Ltd, number 10870840, incorporated 2017: 9 years of filings behind the name. Registered office: Woodside House, 22 Guildown Avenue, Woodside Park, London, N12 7DQ, N12 7DQ. By its SIC codes the business is in construction.
Holding a licence is the expensive, slow part done. For Xtra Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.