The register
The register lists HollandGreen Ltd in Thame, Oxon 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).
Companies House lists it as Hollandgreen Limited, number 07428883, incorporated 2010: 15 years of filings behind the name. Registered office: The Old Grammar School, Church Road, Thame, Oxfordshire, OX9 3AJ, OX9 3AJ. Its filed activity puts it in professional and technical services. It has traded under other names before, including Holland and Green Limited, Holland and Green UK 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.