The register
The register lists Bookmark Content 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. The register records its rating as Worker (A rating).
Bookmark Content Ltd is the registered name (Companies House number 01953563), a private limited company on the register since 1985. Registered office: Sea Containers House, Upper Ground, London, SE1 9GL, SE1 9GL. Its filed activity puts it in it, software and media. It has traded under other names before, including Forward Worldwide Limited, Forward 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.