The register
The register lists Artemis Energy 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 the business as Artemis Energy Limited, company number 16247770, a private limited company. The registered office is at 33 Cavendish Square, London, W1G 0PW, W1G 0PW. Its filed activity puts it in finance and insurance.
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.