| Clanco Limited | Real estate | 2018 |
| Clanmore Developments Limited | Construction | 2016 |
| Cleverly Design Ltd | Information & communication | 2023 |
| Clifford & Gregg Limited | Construction | 2015 |
| Cmck Developments Ltd | Construction | 2003 |
| Coach House Capital Limited | Professional & scientific | 2012 |
| Coach House Group Ltd | Wholesale & retail | 2025 |
| Columbus Fifty Eight Ltd | Financial services | 2021 |
| Communicaclear Ltd | Education | 2025 |
| Control Zone Security Ltd | Administrative & support | 2017 |
| Copmanthorpe Developments Ltd | Construction | 2024 |
| Copper FOX Design Studio Ltd | Wholesale & retail | 2018 |
| Corbetts Dromore Ltd | Wholesale & retail | 2017 |
| Corlagh Contracts Ltd | Construction | 2021 |
| Cornerstone Kitchens & Interiors Ltd | Manufacturing | 2018 |
| Cornerstone Property Developments Ltd | Construction | 2013 |
| Cosy Nest Evolution Ltd | Real estate | 2025 |
| Cottage Catering Limited | Real estate | 1995 |
| Cozy COW Bedding Ltd | Manufacturing | 2013 |
| Cozy Pooch Ltd | Wholesale & retail | 2024 |
| CPC Services (NI) Ltd | Manufacturing | 2014 |
| CPJ Building Contracts Ltd | Construction | 2024 |
| Cranberry Holdings Ltd | Real estate | 2023 |
| Croob-Tech Limited | Professional & scientific | 2025 |
| Cross Functional Fitness Ltd | Arts & recreation | 2017 |
| Croziers of Banbridge Limited | Hospitality | 2026 |
| D H Supplies Ltd | Wholesale & retail | 2019 |
| D S M (NI) Ltd | Professional & scientific | 2013 |
| D&D Freight Limited | Transport & logistics | 2021 |
| D&S Contracts Limited | Construction | 2007 |
| DA Agencies Limited | Wholesale & retail | 2022 |
| Dargan Holdings Ltd | Real estate | 2024 |
| Data Mastery - Microsoft Fabric & Power BI Ltd | Professional & scientific | 2025 |
| DC Digital Ltd | Professional & scientific | 2023 |
| DG Mechanical Ltd | Wholesale & retail | 2025 |
| Dickson Marketing Ltd | Professional & scientific | 2021 |
| Disciplined Mind Ltd | Professional & scientific | 2026 |
| Doggos Doggy Day Care Ltd | Other services | 2021 |
| Downshire Caravans Ltd | Wholesale & retail | 2017 |
| Drive & Shine - Auto Detailing Ltd | Other services | 2025 |
| Dromara Connect | Other services | 2016 |
| Dromore Childcare Centre | Education | 2010 |
| Dromore Education & Community Partnership | Arts & recreation | 2007 |
| Dromore General Services Ltd | Real estate | 2021 |
| Dromore Motor Repairs Ltd | Wholesale & retail | 2016 |
| Dromore Taxis Ltd | Transport & logistics | 2024 |
| Drumaghadone Estates Ltd | Real estate | 2026 |
| Drumaghadone Holdings Ltd | Real estate | 2026 |
| Dullaghan Locum Services Ltd | Health & social care | 2023 |
| Dunabelle Corp Ltd | Wholesale & retail | 2023 |
| Dyleri Consulting Ltd | Information & communication | 2023 |
| E. J. Priestley Haulage Limited | Transport & logistics | 2014 |
| East Down Building Limited | Construction | 2018 |
| Edgewater Apartments Management Limited | Households | 2024 |
| Edward Patterson MC Limited | Professional & scientific | 2016 |
| Emerald Solar Installations Ltd | Construction | 2014 |
| Emotive Autoworks Ltd | Professional & scientific | 2025 |
| Emstead Property Ltd | Real estate | 2025 |
| Equipment & Plant Services Ltd | Wholesale & retail | 2019 |
| Equipment Sales Ltd | Wholesale & retail | 2020 |
| Esker Mushrooms Ltd | Agriculture & fishing | 2017 |
| Everycare Solutions Limited | Health & social care | 2012 |
| EWE Developments Ltd | Construction | 2013 |
| Ewetwo Developments Ltd | Real estate | 2015 |
| Fairyhill Properties Limited | Real estate | 2023 |
| Farm Biogas N.I. Limited | Manufacturing | 2019 |
| Fathers Love Ministry Ireland Ltd | Administrative & support | 2019 |
| Ffcs Trading Ltd | Education | 2021 |
| Finner Properties Limited | Real estate | 2005 |
| Finnis Construction Ltd | Construction | 2024 |
| Firewood Supplies Dromore Ltd | Agriculture & fishing | 2025 |
| Form Natural Design LP | | 2022 |
| Frank Campers Ltd | Wholesale & retail | 2023 |
| Furnishing Distributors Limited | Wholesale & retail | 1991 |
| G F Coyle (N.I.) Ltd | Wholesale & retail | 2023 |
| G W Russell Ltd | Professional & scientific | 2016 |
| G&D Building Services Limited | Construction | 2025 |
| G.E.M. Retailing Ltd | Wholesale & retail | 2025 |
| Gazelle Grace Ltd | Wholesale & retail | 2025 |
| GENESIS123 Ltd | Construction | 2022 |
| Gibson Lucan Holdings Limited | Financial services | 2025 |
| Gibson Radiology Limited | Health & social care | 2019 |
| Giraffe Logic Systems Limited | Professional & scientific | 2013 |
| GLA Contracts Ltd | Construction | 2023 |
| Glenbrook Agri Limited | Agriculture & fishing | 2005 |
| GMS Aviation Limited | Transport & logistics | 2011 |
| Go FLY Helis and Sims Ltd | Administrative & support | 2024 |
| Gracey Customs Clearance Limited | Administrative & support | 2022 |
| Grahams Cars Ltd | Extraterritorial | 2024 |
| Green Energy Engineering Ltd | Manufacturing | 2009 |
| Green Island Invest Limited | Financial services | 2020 |
| Green Tech Electronics Ltd | Construction | 2023 |
| Greenan Manor Management Ltd | Households | 2024 |
| Greenvalleymechanical Ltd | Construction | 2024 |
| Greenwell Property Developments Ltd | Construction | 2022 |
| Greybridge Capital Limited | Financial services | 2022 |
| GRO Business Management Services Ltd | Professional & scientific | 2025 |
| Groundforce Recruitment Limited | Other services | 2021 |
| GWV Ltd | Real estate | 2024 |
| H, C & M O'Neill Ltd | Agriculture & fishing | 2025 |