The register
Appsumer Limited, London, holds a Home Office sponsor licence covering 2 routes: Global Business Mobility: Senior or Specialist Worker and Skilled Worker. It has been on the register since at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Appsumer Ltd, number 09370695, incorporated 2014: 11 years of filings behind the name. The registered office is at 7th & 8th Floors 24 King William Street, London, EC4R 9AT, EC4R 9AT. 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.