The register
The register lists Martha Schwartz Partners 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 Martha Schwartz Partners Limited, number 05200492, incorporated 2004: 22 years of filings behind the name. The registered office is at 283 Green Lanes, London, N13 4XS, N13 4XS. By its SIC codes the business is in professional and technical services. It has traded under other names before, including Martha Schwartz Partnership Limited.
Holding a licence is the expensive, slow part done. For Martha Schwartz Partners Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.