The register
The register lists Mercer Lewin Ltd in Oxford, Oxfordshire 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).
Mercer Lewin Ltd is the registered name (Companies House number 09367132), a private limited company on the register since 2014. Registered office: 6-7 Citibase, New Barclay House, 234 Botley Road, Oxford, OX2 0HP, OX2 0HP. By its SIC codes the business is in professional and technical services. It has traded under other names before, including Bashco 48 Limited.
A licence says an organisation may sponsor; it does not say it is hiring today. The way to find out is the same as for any employer: the careers page, the job boards, and a direct approach with a UK-style CV that says early that sponsorship would be needed.