The register
The register lists Atheneum Limited 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. Its rating on the register is Worker (A rating).
At Companies House the business is Atheneum Limited (company number 08956278), a private limited company incorporated in 2014, 12 years ago. The registered office is at 100 Victoria Street, London, SW1E 5JL, SW1E 5JL. By its SIC codes the business is in professional and technical services. It has traded under other names before, including Atheneum Partners 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.