The register
The register lists S20 The Boundary Limited in Sheffield 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 S20 the Boundary Limited, number 13058602, incorporated 2020: 5 years of filings behind the name. Registered office: Unit 5, Riverside Business Park, Buxton Road, Bakewell, DE45 1GS, DE45 1GS. Its filed activity puts it in arts, sport and leisure. It has traded under other names before, including Belleplaine Properties Limited.
Holding a licence is the expensive, slow part done. For S20 The Boundary Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.