| Craigmore Utilities Ltd | Construction | 2023 |
| Crescent Fire Solutions Ltd | Professional & scientific | 2024 |
| Crewelands Ltd | Real estate | 2022 |
| Crossfire Specialist Contracts Ltd | Construction | 2002 |
| Crushing Screening Parts Limited | Wholesale & retail | 2014 |
| CTF Sectional Buildings Ltd | Construction | 2006 |
| Cunningham Covers Limited | Manufacturing | 1987 |
| Cúram Teoranta | Education | 2021 |
| D & C Poultry Limited | Agriculture & fishing | 2020 |
| D & L Trading Ltd | Construction | 2010 |
| Danmatt Ltd | Financial services | 2021 |
| DJ Mulholland Ltd | Transport & logistics | 2026 |
| DK Paving Ltd | Construction | 2020 |
| DLT Homes Ltd | Construction | 2021 |
| DMD Haulage & Groundworks Ltd | Transport & logistics | 2016 |
| DMG Autos Ltd | Wholesale & retail | 2025 |
| Dream Vision Consultancy Limited | Professional & scientific | 2025 |
| Drenched (NI) Bathrooms & Tiles Ltd. | Construction | 2009 |
| DRJ Construction Ltd | Construction | 2025 |
| Drumlane Livestock Ltd | Agriculture & fishing | 2017 |
| Drywall Damp Proofing Limited | Construction | 2005 |
| DSP Supermarkets Limited | Wholesale & retail | 2000 |
| DSR (Digger Spares & Repairs) Ltd | Manufacturing | 2018 |
| Dunadry Lane Management Company Limited | Households | 2026 |
| E.A. Martin & SON Ltd | Wholesale & retail | 2014 |
| Eabha Ltd | Wholesale & retail | 2026 |
| Electricity Plant Solutions Ltd | Administrative & support | 2008 |
| Elevate Sports Solutions Limited | Wholesale & retail | 2011 |
| EMA & Co Solutions Ltd | Financial services | 2022 |
| Emergency Medical Supplies, Services and Training Ltd | Education | 2020 |
| Emma Wilson NI Ltd | Professional & scientific | 2024 |
| Enzo Pizza Ltd | Hospitality | 2021 |
| Excel Plastics Decking Supplies (NI) Limited | Construction | 2023 |
| Fairhill Plant Hire Limited | Other services | 2025 |
| Fairhill Youth Centre | Administrative & support | 2012 |
| Falcarrow Limited | Wholesale & retail | 2021 |
| Fearmor Contracts Limited | Construction | 2011 |
| Finnbridge Limited | Financial services | 2021 |
| Fios Solutions Limited | Administrative & support | 2025 |
| Five Mile Productions Ltd | Information & communication | 2014 |
| FMG Property Limited | Real estate | 2023 |
| Fortview Poultry Limited | Agriculture & fishing | 2005 |
| Foyle Shipping Services Ltd | Transport & logistics | 2016 |
| Full Gallop Clothing Ltd | Wholesale & retail | 2026 |
| G-Hill Pipe & Civil Ltd | Construction | 2016 |
| Gallagher Contracts (NI) Ltd | Construction | 2014 |
| Geco Property Rental Ltd | Real estate | 2018 |
| Getty Contract Services Ltd | Wholesale & retail | 2016 |
| Glebe S.A.P. Services Ltd | Construction | 2017 |
| Glen Road Service Station Limited | Wholesale & retail | 2018 |
| Glen Utilities Services Limited | Construction | 2016 |
| Glencarn Property Ltd | Hospitality | 1996 |
| Glenshane Country Farm Ltd | Administrative & support | 2019 |
| Glenshane Holdings Ltd | Financial services | 2016 |
| Glenswa Ltd | Other services | 2021 |
| Gopher Ltd | Professional & scientific | 2021 |
| Gormley Car Sales Limited | Wholesale & retail | 2017 |
| Gort Construction Limited | Construction | 2011 |
| Gort Property Limited | Wholesale & retail | 2018 |
| GPH (N.I.) Ltd | Construction | 2015 |
| Grade One Furniture Ltd | Manufacturing | 2016 |
| Granaghan Enterprise Company Ltd | Real estate | 2000 |
| Grass Roots Renewables C.I.C. | Energy | 2008 |
| Green Valley Transport Ltd | Transport & logistics | 2026 |
| Greim Gasta Limited | Hospitality | 2022 |
| Grey Field Poultry Limited | Agriculture & fishing | 2019 |
| Gunning and Mcguckin Utilities Limited | Energy | 2020 |
| Hagansbay Ltd | Education | 2023 |
| Harkin's Pharmacy Limited | Wholesale & retail | 2011 |
| HD46 Ltd | Real estate | 2025 |
| Heaney Motor Company Limited | Wholesale & retail | 2010 |
| Heatserv Mechanical Ltd | Construction | 2019 |
| Helpinghands in the Community NI Ltd | Health & social care | 2021 |
| Hemi Developments Limited | Construction | 2025 |
| Higher Line Coaching Limited | Education | 2023 |
| Hillside Designs Ireland Ltd | Professional & scientific | 2024 |
| HJC Formwork Limited | Manufacturing | 2026 |
| HJC Joinery Ltd | Construction | 2022 |
| Hortus Vitae Ltd | Wholesale & retail | 2015 |
| HSB Hire Limited | Wholesale & retail | 2008 |
| Hugh Turner Construction Ltd | Agriculture & fishing | 2004 |
| Hughes Vehicle Exports Limited | Wholesale & retail | 2018 |
| Hunter's Hope Trauma Recovery Limited | Other services | 2024 |
| Intelligent Construction Engineering Ltd | Construction | 2019 |
| Interior Building Solutions Limited | Construction | 2005 |
| Inver Burn Holdings Ltd | Energy | 2024 |
| J Bradley Contracts Ltd | Construction | 2021 |
| J Bradley Roofing & Joinery Limited | Construction | 2022 |
| J&W Mcmullan Haulage Ltd | Transport & logistics | 2019 |
| J3 Belts & Bearings Ltd | Wholesale & retail | 2020 |
| JBM Joinery Contracts Ltd | Construction | 2024 |
| JME Utilities & Groundworks Ltd | Construction | 2026 |
| JMK Commercials Ltd | Manufacturing | 2016 |
| JNL Construction Ltd | Construction | 2016 |
| John Grant Haulage Ltd | Transport & logistics | 2020 |
| K & H Engineering Ltd | Manufacturing | 2024 |
| K Corbett Tractors Ltd | Wholesale & retail | 2026 |
| K4 Consultancy Limited | Professional & scientific | 2019 |
| Kachelia Limited | Wholesale & retail | 2024 |
| Kearney's Bar Ltd | Hospitality | 2012 |