The register
The register lists Nstt Global 1 Limited in London as a licensed sponsor on Skilled Worker, an entry that goes back to at least 2026. The register records its rating as Worker (A rating).
At Companies House the business is Nstt Global 1 Limited (company number 14127385), a private limited company incorporated in 2022, 4 years ago. The registered office is at 148 High Street, Watford, WD17 2EN, WD17 2EN. Its filed activity puts it in retail. It has traded under other names before, including Nationwide Talk Ltd, Victim No More Ltd.
Holding a licence is the expensive, slow part done. For Nstt Global 1 Limited the question each time is only whether the role and the pay fit the current rules, and that is checked per vacancy.