The register
The register lists Clearstream London Limited in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. The register records its rating as Worker (A rating).
Companies House lists it as Clearstream London Limited, number 11741614, incorporated 2018: 7 years of filings behind the name. Registered office: 11 Westferry Circus Canary Wharf, London, E14 4HE, E14 4HE. By its SIC codes the business is in it, software and media.
Holding a licence is the expensive, slow part done. For Clearstream London Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.