The register
The register lists Quantex Arc Limited 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).
Quantex Arc Limited is the registered name (Companies House number 07035518), a private limited company on the register since 2009. Registered office: Venture House 2 Arlington Square, Downshire Way, Bracknell, RG12 1WA, RG12 1WA. By its SIC codes the business is in business services.
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.