The register
The register lists Thirdfort Limited in London, London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
At Companies House the business is Thirdfort Limited (company number 10757456), a private limited company incorporated in 2017, 9 years ago. Registered office: Belle House Platform 1, Victoria Station, London, SW1V 1JT, SW1V 1JT. Its filed activity puts it in it, software and media. It has traded under other names before, including Foex Limited.
Holding a licence is the expensive, slow part done. For Thirdfort Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.