The register
The register lists SEM Contracting & Consulting 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).
At Companies House the business is Sem Contracting & Consulting Ltd (company number 11233997), a private limited company incorporated in 2018, 8 years ago. Registered office: 31e Abbey Road, London, NW8 9AU, NW8 9AU. Its filed activity puts it in construction.
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.