The register
The register lists Square Burgers Limited in Nottingham as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Square Burgers Limited, number 13968770, incorporated 2022: 4 years of filings behind the name. The registered office is at 59 Nottingham Road, Ravenshead, Nottingham, Notts, NG15 9HG, NG15 9HG. By its SIC codes the business is in hospitality.
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.