The register
The register lists Alten 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 Alten Ltd (company number 08452862), a private limited company incorporated in 2013, 13 years ago. The registered office is at Saffron House, 6-10 Kirby Street, London, EC1N 8TS, EC1N 8TS. Its filed activity puts it in professional and technical services. It has traded under other names before, including Alten Technology Limited.
Holding a licence is the expensive, slow part done. For Alten Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.