The register
The register lists ProvenWorks in Reading, Berkshire 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 Proven Works Limited (company number 06488766), a private limited company incorporated in 2008, 18 years ago. The registered office is at John Adams House, 29 Castle Street, Reading, RG1 7SB, RG1 7SB. By its SIC codes the business is in it, software and media.
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.