The register
The register lists Sotheby's in London as a licensed sponsor on Skilled Worker and Global Business Mobility: Senior or Specialist 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 Sotheby's, number 00874867, incorporated 1966: 60 years of filings behind the name. The registered office is at 34-35 New Bond Street, London, W1A 2AA, W1A 2AA. Its filed activity puts it in other services. It has traded under other names before, including Sotheby Parke Bernet & Co..
For a candidate this means one less obstacle: Sotheby's already has the licence most employers would have to apply for. The rest is the ordinary job of getting the interview.