The register
The register lists Adder Technology Limited in Cambridge 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).
At Companies House the business is Adder Technology Limited (company number 01823478), a private limited company incorporated in 1984, 42 years ago. Registered office: West Walk Building, 110 Regent Road, Leicester, LE1 7LT, LE1 7LT. Its filed activity puts it in manufacturing and engineering. It has traded under other names before, including Adder Publishing Limited, Neatkey 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.