The register
RiverArk Limited, London, holds a Home Office sponsor licence on the Skilled Worker route, and has been on the register since at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Riverark Limited, number 07815952, incorporated 2011: 15 years of filings behind the name. Registered office: 167-169 Great Portland Street, 5th Floor, London, W1W 5PF, W1W 5PF. Its filed activity puts it in professional and technical 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.