| Millfield Village Management Limited | Extraterritorial | 1993 |
| Moneycarrie Engineering Limited | Manufacturing | 1979 |
| Morellis of Portstewart Limited | Hospitality | 1999 |
| Murphy Joinery Limited | Construction | 2005 |
| MYM Recruitment Ltd | Administrative & support | 2007 |
| Network Personnel Ltd | Education | 1989 |
| NI031025 Limited | Construction | 1996 |
| Nite Nite (NI) Ltd. | Other services | 1987 |
| North Coast Integrated College Limited | Education | 1995 |
| North West Galvanising Limited | Manufacturing | 2004 |
| P & a Turner & Sons Ltd | Construction | 2002 |
| P & K Contracts Ltd | Construction | 2006 |
| P Bradley Contracts Limited | Construction | 2005 |
| P. J. Conway (Developments) N.I. Limited | Construction | 1980 |
| Padly Limited | Real estate | 1998 |
| Park PCS Limited | Information & communication | 2004 |
| Peninsula Construction Limited | Construction | 1980 |
| Peninsula Hi-Tech Limited | Real estate | 1980 |
| Peninsula Securities Limited | Real estate | 1981 |
| Planned Media Communications Limited | | 1984 |
| Portmore Management Company Ltd | Extraterritorial | 2006 |
| Portstewart Homes Limited | Extraterritorial | 1981 |
| Provincial Butchers Supplies NI Limited | Households | 1989 |
| R J J Killen Ltd | Agriculture & fishing | 1999 |
| R. H. Huston & SON Limited | Real estate | 1958 |
| Reid Machinery Sales Limited | Manufacturing | 1979 |
| Richard Brattin Financial Services Ltd | Financial services | 2007 |
| Right Price Carpets and Furniture Limited | Wholesale & retail | 1978 |
| Road Safety Contracts Limited | Water & waste | 1990 |
| ROE Valley Community Property Limited | Other services | 2000 |
| Rugby Avenue Coleraine Management Company Limited | Extraterritorial | 2006 |
| Rural Area Partnership in Derry Limited | Other services | 1996 |
| S&G Construction Limited | Extraterritorial | 1979 |
| S.H. Watterson (Machinery) Limited | Real estate | 1976 |
| Sanda Agencies Limited | | 1989 |
| Scott & Stinson Engineering Ltd | Construction | 2007 |
| SDP Hire Ltd | Administrative & support | 2009 |
| Seahaven Homes Limited | Construction | 1983 |
| Slaney Limited | Real estate | 1994 |
| Solid Surface (N.I.) Ltd | Manufacturing | 2004 |
| Spices Nice Limited | Manufacturing | 1972 |
| Star Fuels Limited | Wholesale & retail | 1990 |
| Stephen W Moore Limited | Wholesale & retail | 2008 |
| Strandview Management Company Ltd | Extraterritorial | 2007 |
| Strathfoyle Community Association Limited | Administrative & support | 1989 |
| Structures 2000 Limited | Construction | 2004 |
| Suffolk Mews Management Company Ltd | Extraterritorial | 2006 |
| Sunfield Investments Limited | Extraterritorial | 1993 |
| T B F Thompson (Engineering) Limited | Extraterritorial | 1999 |
| T.D. Macfarlane Limited | Real estate | 1955 |
| Tabbda Company Limited | Other services | 1998 |
| TAS Racing Ltd | Arts & recreation | 2001 |
| Troy Estate Limited | Real estate | 1938 |
| Tuscany Developments Limited | Construction | 2005 |
| Tweedy Acheson & Co.,(Coleraine) Limited | Wholesale & retail | 1977 |
| W & R Holdings Limited | Hospitality | 2005 |
| W J Dickson (Builders) Ltd | Construction | 2003 |
| W.D. Meats | Manufacturing | 1979 |
| W.J. Bolton & SON (Merchants) Limited | Wholesale & retail | 1977 |
| Wallace Towers / Masts Ltd | Information & communication | 2007 |
| Workman Services Limited | Construction | 2002 |