The register
The register lists Core (UK) Limited in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. The register records its rating as Worker (A rating).
Companies House lists it as Core (UK) Limited, number 03106158, incorporated 1995: 31 years of filings behind the name. Registered office: First Floor, 50 Lisson Street, London, NW1 5DF, NW1 5DF. Its filed activity puts it in it, software and media. It has traded under other names before, including Advantage Retail Technology Limited.
For a candidate this means one less obstacle: Core (UK) Limited already has the licence most employers would have to apply for. The rest is the ordinary job of getting the interview.