The register
The register lists ATC Brokers Ltd in London as a licensed sponsor on Global Business Mobility: Senior or Specialist Worker, an entry that goes back to at least 2026. Rating on the current register: Worker (A rating).
Companies House lists it as Atc Brokers Limited, number 08036570, incorporated 2012: 14 years of filings behind the name. The registered office is at 3rd Floor Waverley House, 7-12 Noel Street, London, W1F 8GQ, W1F 8GQ. By its SIC codes the business is in business services.
Holding a licence is the expensive, slow part done. For ATC Brokers Ltd the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.