The register
The register lists Sioma Professionals 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 Sioma Professionals Limited, number 13683509, incorporated 2021: 5 years of filings behind the name. Registered office: Floor 3 38 South Molton Street, London, W1K 5RL, W1K 5RL. By its SIC codes the business is in finance and insurance.
Holding a licence is the expensive, slow part done. For Sioma Professionals Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.