The register
The register lists Mu Sigma Limited in North Harrow, Middlesex as a licensed sponsor on Global Business Mobility: Senior or Specialist Worker and Skilled Worker, 2 routes in all, and has done since at least 2026. Its rating on the register is Worker (A rating).
Companies House lists it as MU Sigma Limited, number 06711615, incorporated 2008: 18 years of filings behind the name. The registered office is at 2 Churchill Court, 58 Station Road, North Harrow, Middlesex, HA2 7SA, HA2 7SA. By its SIC codes the business is in it, software and media.
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.