NATS is the UK's leading provider of air traffic control services. In a typical year pre-Covid, they handle over 2.5 million flights and 250 million passengers travelling over the UK and across the North Atlantic. If you’ve been a passenger on a commercial aircraft flying in UK airspace, then it's highly likely that they have handled your flight.
Outside of the UK, they offer leading air traffic products and services to customers including airports, airlines, air traffic service providers and governments. They currently provide these across parts of Europe, North America, the Middle East and Asia.