The register
The register lists Fontaine 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).
Companies House lists it as Fontaine Limited, number 12355591, incorporated 2019: 6 years of filings behind the name. The registered office is at C/O Tmf Group, 13th Floor, One Angel Court, London, EC2R 7HJ, EC2R 7HJ. By its SIC codes the business is in finance and insurance.
What the licence tells a candidate is that the door is not locked. Whether it is open this month is a question for Fontaine Limited's own careers page and the job boards, and the answer changes with the season and the order book.