| CPR Simply Skin Ltd | Wholesale & retail | 2022 |
| CR Catering (NI) Ltd | Hospitality | 2025 |
| CR Scaffolding/Construction Ltd | Construction | 2025 |
| Crafden Ltd | Professional & scientific | 2025 |
| Craic Foods Limited | Manufacturing | 2015 |
| Craigavon & Banbridge Volunteer Centre | Health & social care | 1996 |
| Craigavon Area Compassion Project | Hospitality | 2012 |
| Craigavon Autoparts Ltd | Wholesale & retail | 2010 |
| Craigavon Cabs Ltd | Transport & logistics | 2026 |
| Craigavon Chiropractic Ltd | Health & social care | 2011 |
| Craigavon Christian Youth | Other services | 2010 |
| Craigavon GAS Services Ltd | Construction | 2014 |
| Craigavon Group Limited | Financial services | 2022 |
| Craigavon Samaritans | Other services | 2017 |
| Craigavon Specsavers Limited | Wholesale & retail | 1999 |
| Craigavon TV Service Centre Limited | Manufacturing | 2011 |
| Craigavon Visionplus Limited | Wholesale & retail | 1999 |
| Crankids Ltd | Wholesale & retail | 2025 |
| Crannymore Construction Ltd | Construction | 2017 |
| Cranston Consulting Ltd | Administrative & support | 2010 |
| Crave Kebabish Ltd | Hospitality | 2024 |
| Crawford Cleanwell Ltd | Administrative & support | 2011 |
| Cream Curls (Lurgan) Limited | Hospitality | 2021 |
| Creative Kitchens (Ireland) Ltd | Manufacturing | 2010 |
| Creenagh Contracts Ltd | Construction | 2024 |
| CRL Investment Property Ltd | Real estate | 2023 |
| Crocodile Corporation Ltd - the | Extraterritorial | 2003 |
| Cromie Investments Ltd | Other services | 2025 |
| Crossroads Properties Limited | Hospitality | 1999 |
| Crucible Labs Ltd | Information & communication | 2026 |
| Crystal Clear Car Wash and Valet Centre Limited | Wholesale & retail | 2018 |
| Cs-Max Ltd | Wholesale & retail | 2022 |
| Csnj Investments Limited | Real estate | 2025 |
| CSP (NI) Limited | Wholesale & retail | 2013 |
| Cssg Services Trading AS Active Pest Management Ltd | Other services | 2023 |
| CTS Analytical Limited | Extraterritorial | 1967 |
| Cull's Market Bar Limited | Hospitality | 2011 |
| Culture Media Ltd | Professional & scientific | 2025 |
| Cultúrlann NA Lorgan Ltd | Education | 2026 |
| Cumulus Ltd | Information & communication | 2017 |
| Cupertino Aviation Services Limited | Transport & logistics | 2025 |
| Currie's Bridge Limited | Wholesale & retail | 2015 |
| Currie's Seagoe Limited | Real estate | 2015 |
| Cusher Holdings Limited | Construction | 2017 |
| Cusher Transport Ltd | Transport & logistics | 2024 |
| Custom Living Spaces Ltd | Construction | 2024 |
| CUT Diamond Media Limited | Information & communication | 2017 |
| CWB MEP Revit Ltd | Professional & scientific | 2023 |
| Cyril Johnston Rental Ltd | Administrative & support | 2026 |
| Cúram LE Chéile Limited | Information & communication | 2021 |
| D & K Architectural Systems Ltd | Construction | 2013 |
| D Gilmore Developments Limited | Construction | 2016 |
| D J Maguire & Associates Ltd | Health & social care | 2012 |
| D K Foster Transport Limited | Transport & logistics | 2016 |
| D S Electrics Limited | Construction | 2015 |
| D&M Select Cars Ltd | Wholesale & retail | 2025 |
| D-Bees Hybrid Estate Agents Ltd | Real estate | 2018 |
| D. Abraham Construction Limited | Construction | 2019 |
| D.C. Auto's Car Detailing Ltd | Wholesale & retail | 2026 |
| D4M Motors Ltd | Wholesale & retail | 2025 |
| Daily Fresh Ltd | Wholesale & retail | 2004 |
| Dairyadd Farm Ltd | Hospitality | 2024 |
| Daisybk Limited | Public administration | 2023 |
| Daly O'Neill & Associates Limited | Professional & scientific | 2004 |
| Damian Doone Plumbing Services Ltd | Construction | 2017 |
| Dammie OJO Limited | Health & social care | 2015 |
| Danann Crafts Ltd | Wholesale & retail | 2017 |
| Danann Creative Hub Ltd | Arts & recreation | 2019 |
| Dance United Impact C.I.C. | Arts & recreation | 2026 |
| Danny's Chippy Ltd | Hospitality | 2024 |
| Dappo Technologies Ltd | Information & communication | 2025 |
| DAR Holdings (N.I.) Limited | Financial services | 2021 |
| Dario Tech Solutions Ltd | Manufacturing | 2026 |
| Dart Direct | Transport & logistics | 2012 |
| Dartan Hall Managment COY Limited | Households | 2018 |
| Darwood Medical Services Ltd | Health & social care | 2015 |
| DAS Spice Ltd | Hospitality | 2023 |
| Data Management & Maintenance Limited | Information & communication | 2016 |
| Datos Software Solutions Limited | Information & communication | 2022 |
| Datum Engineering Ltd | Professional & scientific | 2025 |
| Datum Monitoring Ireland Limited | Construction | 2005 |
| David Croome Limited | | 2003 |
| David Haire Architectural Design Ltd | Professional & scientific | 2025 |
| David Jameson Properties Limited | Real estate | 2006 |
| David Jameson Roofing Services Ltd | Construction | 2010 |
| David Johnston Design Limited | Wholesale & retail | 1983 |
| David Kerr Roofing Ltd | Construction | 2012 |
| David Kimber Designs Ltd | Professional & scientific | 2023 |
| David Mcmaster Architect Limited | Professional & scientific | 2011 |
| Davison Canners Limited | Agriculture & fishing | 1978 |
| Davison Fabrication Ltd | Manufacturing | 2025 |
| Davison Investments Limited | Extraterritorial | 2007 |
| Davlor Limited | Mining & quarrying | 2015 |
| Daytoday Lurgan Limited | Wholesale & retail | 2025 |
| DB Outdoor Living Centre Ltd | Construction | 2018 |
| DB Property Maintenance Ltd | Construction | 2020 |
| DB Tiles Ltd | Construction | 2018 |
| DC Wallace Engineering Ltd | Manufacturing | 2016 |
| DE Borja Ltd | Wholesale & retail | 2021 |
| Deadspin Solutions Ltd | Information & communication | 2026 |