The register
Mux UK Limited, London, holds a Home Office sponsor licence covering 2 routes: Global Business Mobility: Senior or Specialist Worker and Skilled Worker. It has been on the register since at least 2026. Its rating on the register is Worker (A rating).
MUX UK LTD is the registered name (Companies House number 11054768), a private limited company on the register since 2017. The registered office is at Birchin Court 5th Floor, 19-25 Birchin Lane, London, EC3V 9DU, EC3V 9DU. Its filed activity puts it in business 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.