| D-Scaff Ltd | Construction | 2007 |
| D. Shannon Stewart Limited | Wholesale & retail | 1978 |
| D.M.G. Electrics Limited | Construction | 1978 |
| Dacara Properties Ltd | Other services | 1994 |
| Daniel's Bars Ltd | Wholesale & retail | 2003 |
| Dee's Frozen Foods Limited | Administrative & support | 2006 |
| Dellmount Court Service Company Limited | Households | 2000 |
| Dial a Clean Limited | Administrative & support | 2005 |
| DMB Farm and Garden Limited | Agriculture & fishing | 2004 |
| DMP (NI) Ltd | Real estate | 2007 |
| DMS Personnel Consultants (Ireland) Limited | Professional & scientific | 1999 |
| Donaghadee Crescent Wharf Management Company Limited | Administrative & support | 1991 |
| Douglen Developments Limited | Construction | 2006 |
| Down Community Care Agency Ltd | Health & social care | 2007 |
| Down Drains Limited | Other services | 1998 |
| Down Fork Lift Training Limited | Transport & logistics | 2002 |
| Down Hire Centre Ltd | Administrative & support | 2007 |
| Downey Developments Limited | Hospitality | 1991 |
| Downshire Arms Hotel Limited | Hospitality | 1998 |
| Downshire Rifle Club Limited | Arts & recreation | 1997 |
| Drayman Developments Limited | Construction | 1994 |
| Dromore Properties Limited | Hospitality | 1984 |
| Drumcove Enterprise Limited | Construction | 2006 |
| Drumhorc Pallets Limited | Manufacturing | 1988 |
| Duir Holdings Ltd | Construction | 2015 |
| Dunmore Construction Limited | Construction | 1989 |
| Duralay International Holdings Limited | | 1999 |
| Duralay Limited | | 1999 |
| Eastower (N.I.) Ltd | Wholesale & retail | 1985 |
| Ecodepo(Uk) Ltd | Manufacturing | 2005 |
| EDS Ireland Limited | Professional & scientific | 1997 |
| Ender Enterprises Limited | Hospitality | 1992 |
| Enviro Properties Limited | Construction | 2005 |
| Environmental Fabrications Limited | Manufacturing | 1993 |
| Equipment Support Solutions Ltd | Professional & scientific | 2008 |
| Eugene Clarke & Sons Ltd | Wholesale & retail | 2004 |
| Exploiting Technology Limited | Information & communication | 2007 |
| Family Spectrum Limited | Other services | 2004 |
| Farmhill Properties Limited | Real estate | 2006 |
| Farrell & Farrell LLP | | 2007 |
| Feherty Travel Limited | Administrative & support | 1973 |
| Fiji (N.I.) Limited | Real estate | 1958 |
| Finbarn Ltd | Arts & recreation | 2003 |
| Fire Protection Products Limited | Construction | 2004 |
| Fiveways Shop & Service Station Ltd | Wholesale & retail | 1997 |
| Fleming Mounstephen Planning Limited | Professional & scientific | 2007 |
| Floral Design Limited | Other services | 2005 |
| Formula Karting Limited | Arts & recreation | 1991 |
| Fresh 2 U Ltd | Wholesale & retail | 2003 |
| Fullertons Furnishings & Interiors Limited | | 1996 |
| Furlong Holdings (UK) Limited | Professional & scientific | 2002 |
| G & S Stainless N.I. Limited | Manufacturing | 2011 |
| G Havern Joinery Ltd | Construction | 2007 |
| G. Mcgreevy Construction Limited | Construction | 1988 |
| George Milligan & Sons (Fish Merchants) Limited | Manufacturing | 1977 |
| GH Construction Services Ltd | Construction | 2006 |
| Glas-Seal (NI) Limited | Manufacturing | 1973 |
| Glendun House Limited | Households | 1978 |
| Glenside Acoustics Limited | Construction | 1991 |
| Glenwood (Ards) Management Co. Ltd. | Households | 2005 |
| Gloir | Education | 2006 |
| Go Rock Construction Ltd | Construction | 2006 |
| GOH Electrical Contracts Ltd | Construction | 2006 |
| Golf Spot Limited -the | Wholesale & retail | 1992 |
| Gorlim Limited | Wholesale & retail | 1977 |
| GPT Sales and Services Limited | | 1990 |
| Grand Prix Tyres Limited | Wholesale & retail | 1997 |
| Green Electrical Ltd | Construction | 2003 |
| Greencastle Property Developments Ltd | Real estate | 2002 |
| Greenfield Fertilisers Ltd. | Other services | 1990 |
| Greystone Construction (NI) Ltd | Agriculture & fishing | 2006 |
| GSR Technologies Ltd | Extraterritorial | 2002 |
| H.D. Design Architectural Ltd | Professional & scientific | 2007 |
| Hales Fruit Sales Limited | Wholesale & retail | 1989 |
| Hanna Construction (Ballynahinch) Limited | Construction | 2001 |
| Hanna Developments Limited | Construction | 1999 |
| Hannawin's Medical Hall, Limited | Wholesale & retail | 1934 |
| Harmoni 2019 | Hospitality | 1906 |
| Harrison Contracts (N.I.) Limited | Construction | 2006 |
| He-Shi Enterprises Ltd | Manufacturing | 2006 |
| Henning Bros. Fishing Co. Ltd | Agriculture & fishing | 1988 |
| Heritage Homes (N.I.) Limited | | 1989 |
| Hillard (NI) Limited | Wholesale & retail | 2006 |
| Holmes Poundworld Ltd | Wholesale & retail | 2006 |
| Holywood Golf Club Limited | Arts & recreation | 1923 |
| Hopefield Apartments Management Co. Ltd | Extraterritorial | 2007 |
| Howard Harding Limited | Real estate | 1958 |
| Hudig & Kersten Continent-Ireland Line Limited | | 1997 |
| Huntly Developments Limited | Professional & scientific | 2006 |
| Hustonia Properties Limited | Real estate | 1986 |
| IAN Newell Boat Building & Repair Limited | Manufacturing | 2003 |
| IM Gabbie Ltd | Wholesale & retail | 2002 |
| Impact Fixings Ltd | Construction | 2006 |
| Independant Sports Consultants Limited | Arts & recreation | 2008 |
| Independent Property Estates Limited | Real estate | 2007 |
| Indi Kitchens Ltd | Manufacturing | 2007 |
| Industrial Chemical Services of N.I. Limited | | 1968 |
| Integrated Engineering Consulting Limited | Construction | 2016 |
| Irish Biscuits (N.I.) Limited | Administrative & support | 1968 |
| Islandderry Construction Ltd | Construction | 2004 |