The register
The register lists Monitronics Limited 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).
At Companies House the business is Monitronics Limited (company number 12534378), a private limited company incorporated in 2020, 6 years ago. Registered office: Hamilton House, Mabledon Place, London, WC1H 9BB, WC1H 9BB. Its filed activity puts it in security, cleaning and facilities.
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.