The register
The register lists ON Semiconductor Limited in Bracknell, Berkshire 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 On Semiconductor Limited, number 03765736, incorporated 1999: 27 years of filings behind the name. Registered office: 1 Bow Churchyard, London, EC4M 9DQ, EC4M 9DQ. Its filed activity puts it in wholesale. It has traded under other names before, including Semiconductor Components Industries UK Limited, Semiconductor Component Industries 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.