The register
The register lists Sina Ltd in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Its rating on the register is Worker (A rating).
Sina Ltd is the registered name (Companies House number 10053079), a private limited company on the register since 2016. Registered office: 71-75 Shelton Street, Covent Garden, London, WC2H 9JQ, WC2H 9JQ. Its filed activity puts it in retail. It has traded under other names before, including Sina Grupa Ltd.
Holding a licence is the expensive, slow part done. For Sina Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.