Mannok, formerly the QUINN group, is a business group headquartered in Derrylin, County Fermanagh, Northern Ireland. The group has ventured into cement and concrete products, container glass, general insurance, radiators, plastics, hotels, and real estate. It was formed by Seán Quinn in 1973, developing from a small quarrying operation in Derrylin into a large organization, employing over 8,000 people in various locations throughout Europe.