The register
Karbone Limited, London, holds a Home Office sponsor licence covering 2 routes: Skilled Worker and Global Business Mobility: Senior or Specialist Worker. It has been on the register since at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Karbone Limited, number 13997281, incorporated 2022: 4 years of filings behind the name. Registered office: C/O Csc Cls (Uk) Limited 5 Churchill Place, 10th Floor, London, E14 5HU, E14 5HU. By its SIC codes the business is in other services.
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.