The register
The register lists Upside Studio Ltd in 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).
Companies House lists it as Upside Studio Ltd, number 09799152, incorporated 2015: 11 years of filings behind the name. The registered office is at 4th Floor, 90 Bartholomew Close, London, EC1A 7BN, EC1A 7BN. By its SIC codes the business is in business services.
Holding a licence is the expensive, slow part done. For Upside Studio Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.