The register
The register lists Posco Capital Partners Plc in London 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 Posco Capital Partners PLC, number 08831417, incorporated 2014: 12 years of filings behind the name. Registered office: 232 - 238 Bishopsgate, Chanray House, London, EC2M 4QD, EC2M 4QD. By its SIC codes the business is in finance and insurance. It has traded under other names before, including Posco Capital Partners Ltd.
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.