The register
The register lists Nielsen Media Research Ltd in London 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. The register records its rating as Worker (A rating).
Companies House lists it as Nielsen Media Research Limited, number 01765758, incorporated 1983: 43 years of filings behind the name. Registered office: Endeavour House, 5th Floor, 189 Shaftesbury Avenue, London, WC2H 8JR, WC2H 8JR. Its filed activity puts it in professional and technical services. It has traded under other names before, including Acnielsen Mms Ltd, Media Monitoring Services Limited.
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.