| Creative DON Design Ltd | Professional & scientific | 2023 |
| Crooked Glen Limited | Financial services | 2020 |
| Crosshill Associates Ltd | Construction | 2012 |
| Crumlin Building Services Limited | Construction | 2021 |
| Crumlin Decor Ltd | Wholesale & retail | 2011 |
| Crumlin Rugby Football Club Limited | Arts & recreation | 2023 |
| D&V Network Solutions Limited | Information & communication | 2012 |
| D. Morrison Engineering Ltd | Professional & scientific | 2026 |
| Dalriada Water Limited | Water & waste | 2004 |
| Dasen Ltd. | Construction | 2012 |
| DCN Property Lets Ltd | Real estate | 2025 |
| DCS (NI) Limited | Wholesale & retail | 2011 |
| Deez Ltd | Hospitality | 2025 |
| Delta Roofing (NI) Ltd | Construction | 2010 |
| Denis Wilson of Glenavy Ltd | Wholesale & retail | 2014 |
| Devlin Auto Select Ltd | Wholesale & retail | 2026 |
| Direct Design and Management Ltd | Professional & scientific | 2025 |
| DM Country Supplies Ltd | Wholesale & retail | 2025 |
| DM Diagnostic Consultancy Ltd | Professional & scientific | 2024 |
| DON Electrical Ltd | Construction | 2026 |
| Doyle & Co Cleaning Ltd | Administrative & support | 2022 |
| DPM Ventures Limited | Financial services | 2020 |
| DR J Mccabe Paediatrics Ltd | Health & social care | 2020 |
| DR Nina Pinto Limited | Health & social care | 2026 |
| Drcamsolutions Ltd | Professional & scientific | 2023 |
| DSA Property Maintenance Ltd | Administrative & support | 2024 |
| Dundarave Estate Holdings Limited | Extraterritorial | 2018 |
| Dundarave Properties Ltd | Real estate | 2014 |
| Duracon (Concrete Castings) Limited | Manufacturing | 1987 |
| DWG Tools Limited | Wholesale & retail | 2018 |
| E O'Neill Consulting Limited | Professional & scientific | 2025 |
| Ecopart NI Ltd | Wholesale & retail | 2009 |
| Elec Co Facilities Management Ltd | Construction | 2021 |
| Emax Electrical Ltd | Construction | 2022 |
| Emax Properties Ltd | Real estate | 2025 |
| Eqnx Limited | Information & communication | 2014 |
| Errigal Motor Company Ltd | Wholesale & retail | 2015 |
| Erris Powerlines Ltd | Energy | 2014 |
| Erwin Agri-Care Limited | Wholesale & retail | 2011 |
| ESG Behaviour Support Ltd | Professional & scientific | 2023 |
| ESG Ivyfarm Ltd | Agriculture & fishing | 2021 |
| ETR Electrical Limited | Construction | 2019 |
| Excel Driving School (NI) Ltd | Education | 2012 |
| Express Recovery Ltd | Transport & logistics | 2024 |
| F I W Services Ltd | Construction | 2009 |
| F.R. Lagan Properties Ltd | Real estate | 2024 |
| Faulkner Properties and Development Ltd | Construction | 2025 |
| Fergus Logistics Limited | Transport & logistics | 2021 |
| Ferry Shore Apartments Management Company Ltd | Households | 2017 |
| Fieldfare Ecology Ltd | Professional & scientific | 2019 |
| Filmae Limited | Information & communication | 2025 |
| First Avenue Coffee Company Limited | Hospitality | 2021 |
| Fit Hub Limited | Arts & recreation | 2021 |
| Fitzrovia Clinics Ltd | Health & social care | 2022 |
| Fitzroy Health Ltd | Health & social care | 2022 |
| Flair Solar Limited | Wholesale & retail | 2024 |
| FN Engineering Services Limited | Administrative & support | 2013 |
| FNY Toys Limited | Wholesale & retail | 2020 |
| Fourfields Engineering Ltd | Professional & scientific | 2024 |
| Furniture Flair Limited | Manufacturing | 2005 |
| FXL Business Solutions Limited | Administrative & support | 2018 |
| Féad Ltd | Professional & scientific | 2024 |
| G Hamill Construction NI Limited | Construction | 2019 |
| G L Ingram Contracts Ltd | Construction | 2024 |
| G.C. Commercials NI Ltd | Wholesale & retail | 2011 |
| Gabar Limited | Manufacturing | 2008 |
| Gaco Properties Ltd | Real estate | 2026 |
| Galeforce HV Engineering Ltd | Other services | 2014 |
| Garrankyle Aviation Ltd | Manufacturing | 2006 |
| Gary Mcgaughey Distribution Ltd | Transport & logistics | 2011 |
| Gasomp Ltd | Wholesale & retail | 2024 |
| Genclad Ltd | Manufacturing | 2014 |
| GH Motors Limited | Wholesale & retail | 2017 |
| Gilmore Homes Ltd | Construction | 1999 |
| GK White Electrical Services Ltd | Construction | 2012 |
| Glenclare Community Group | Administrative & support | 2012 |
| Glendaloch BED & Breakfast Ltd | Hospitality | 2025 |
| Glenforest Joinery Ltd | Construction | 2026 |
| Glengormley Vets Ltd | Professional & scientific | 2024 |
| Glenmount Farm Ltd | Agriculture & fishing | 2025 |
| Glenview Manufacturing Limited | Manufacturing | 2017 |
| GLJ Environmental Limited | Water & waste | 2013 |
| Glynndall Ltd | Wholesale & retail | 2023 |
| Gobrana Holdings Limited | Financial services | 2026 |
| Gracenotes Music Education | Education | 2018 |
| Green Tiger Express (NI) Limited | Transport & logistics | 2010 |
| Grove Cottage Farm Ltd | Agriculture & fishing | 2011 |
| GRP Systems Ltd | Manufacturing | 2005 |
| H&H Recovery Services Ltd | Wholesale & retail | 2025 |
| H.S.S.M. Trading Limited | Administrative & support | 2024 |
| Hadigate Limited | Construction | 2009 |
| Hamco Holdings Limited | Financial services | 2025 |
| Happy XIN JI Ltd | Hospitality | 2026 |
| Harvest Equipment Limited | Wholesale & retail | 2004 |
| Hawthorn Hill Ltd | Agriculture & fishing | 2024 |
| Heavenly Sleep Ltd | Wholesale & retail | 2021 |
| Hekoo Limited | Manufacturing | 2010 |
| Helicopter Management Solutions Limited | Professional & scientific | 2014 |
| Herbert Hall Investments Ltd | Real estate | 2025 |
| Higgins Autos Limited | Wholesale & retail | 2021 |