| Courtyard (Orby) Management Company Limited-The | Real estate | 2002 |
| Cove Leaseco Ltd | Health & social care | 2023 |
| Covimro Ltd | Health & social care | 2020 |
| Coviro Productions Limited | Information & communication | 2011 |
| Covone Limited | Real estate | 2020 |
| Cowan Aero Ltd | Professional & scientific | 2019 |
| Cowd's Castle Limited | Real estate | 2016 |
| Coxcota Limited | Wholesale & retail | 2025 |
| Coyle Systems and Software Ltd. | Information & communication | 2016 |
| Coyles Home Bakery Ltd | Wholesale & retail | 2019 |
| Coyn Ltd | Information & communication | 2021 |
| Coyne Transport & Shipping NI Limited | Transport & logistics | 2018 |
| Cozycrafted Limited | Wholesale & retail | 2025 |
| CP Cars NI Ltd | Wholesale & retail | 2021 |
| CP Hire GB 3 Ltd | Administrative & support | 2024 |
| CPB Consulting Ltd | Information & communication | 2017 |
| Cpc-Ni Ltd | Education | 2025 |
| CPD Developments LLP | | 2007 |
| CPE Ltd | Other services | 2023 |
| CPF Developments Limited | Construction | 2021 |
| CPH Plumbing & Heating Ltd | Construction | 2016 |
| CPL Plumbing Ltd | Households | 2026 |
| CPL Solutions International Limited | Administrative & support | 2008 |
| Cpos (Properties) Limited | Real estate | 1998 |
| CPP Engineering Ltd | Construction | 2015 |
| CPR Futures Ltd | Professional & scientific | 2013 |
| CPS Financial Services Ltd | Financial services | 2023 |
| CPS Planning Limited | Construction | 2020 |
| CPT International Limited | Information & communication | 2004 |
| Cpw(Ni) Ltd | Health & social care | 2012 |
| Cqcdstyb Ltd | Wholesale & retail | 2024 |
| CR Realisations 2023 Limited | Wholesale & retail | 2010 |
| CR Surgery Ltd | Health & social care | 2022 |
| CR8 Properties Ltd | Real estate | 2025 |
| Crab City Limited | Wholesale & retail | 2024 |
| Craft by Blessing Limited | Manufacturing | 2025 |
| Craft Consultancy Ltd | Professional & scientific | 2018 |
| Craft Northern Ireland | Arts & recreation | 2016 |
| Crafted Interiors (Belfast) Limited | Wholesale & retail | 2007 |
| Crafted Solutions (2025) Ltd | Construction | 2025 |
| Craftedhwhimsy Limited | Wholesale & retail | 2024 |
| Crafty Mails Limited | Information & communication | 2025 |
| Crafty Mammies Limited | Manufacturing | 2024 |
| Craic Flavours Ltd | Manufacturing | 2025 |
| Craicni C.I.C. | Education | 2015 |
| Craig a VEY Limited | Financial services | 2020 |
| Craig Foods (NI) Limited | Administrative & support | 2012 |
| Craig Macrae Limited | Manufacturing | 2020 |
| Craigantlet Apartments Limited | Households | 2006 |
| Craigantlet Apartments Phase 2 Ltd | Households | 2020 |
| Craigarogan Management Company Ltd | Households | 2026 |
| Craigavad Park Management Company Ltd | Real estate | 2014 |
| Craiggore Energy Limited | Administrative & support | 2017 |
| Craighill Manor Management Company Limited | Real estate | 2021 |
| Craiglands Court Management Company Limited | Households | 2002 |
| Craignagapple Wind Farm Limited | Extraterritorial | 2007 |
| Craigstown Valley Services Limited | Administrative & support | 2004 |
| Crane Yaxu Limited | Wholesale & retail | 2024 |
| Cranes Food Truck Ltd | Hospitality | 2023 |
| Cranley Cars Limited | Wholesale & retail | 2001 |
| Cranmore Builders Limited | Construction | 2012 |
| Cranmore Executive Search Limited | Administrative & support | 2014 |
| Cranmore Manufacturing Limited | Manufacturing | 2017 |
| Cranmore Point Management Company Ltd | Households | 2015 |
| Cranmore Recruitment Ltd | Administrative & support | 2012 |
| Crann Darach Properties Ltd | Real estate | 2024 |
| Crannog Consultancy Limited | Professional & scientific | 2014 |
| Cransly Path Limited | Administrative & support | 2019 |
| Crateus Pareira Limited | Wholesale & retail | 2023 |
| Craven Recovery (NI) Ltd | Wholesale & retail | 2012 |
| Cravensea Ltd | Wholesale & retail | 2025 |
| Crawford (NI) Limited | Professional & scientific | 2007 |
| Crawford Cleaning & Property Services Ltd | Administrative & support | 2026 |
| Crawford Mulholland Commercial Ltd | Other services | 2024 |
| Crawford Mulholland Wealth Limited | Professional & scientific | 2024 |
| Crawford Neill Limited | Financial services | 2022 |
| Crawford Oncology Ltd | Health & social care | 2024 |
| Crawford Systems Ltd | Administrative & support | 2021 |
| Crawford's Inn Ltd | Hospitality | 2019 |
| Crawfordsburn Gate Management Limited | Households | 2025 |
| Craxel UK Ltd | Information & communication | 2025 |
| Crazy Horse Belfast Ltd | Hospitality | 2017 |
| CRB Specialist Joinery Limited | Manufacturing | 2023 |
| CRE8 Theatre Ltd | Administrative & support | 2017 |
| Creagh Trading Ltd | Wholesale & retail | 2025 |
| Creaghanarourke Holdings Ltd | Financial services | 2021 |
| Cream Curls (Belfast) Limited | Hospitality | 2021 |
| Creaner Ltd | Real estate | 2024 |
| Crear Limited | Agriculture & fishing | 1958 |
| Create Belfast Ltd | Real estate | 2024 |
| Create Interiors Ltd | Professional & scientific | 2023 |
| Creating Help in Local Districts | Education | 2016 |
| Creation Consumer Finance Limited | Financial services | 1997 |
| Creation Homes (N.I.) Limited | Construction | 2015 |
| Creations Interiors Limited | Wholesale & retail | 1987 |
| Creative Cailín Club Ltd | Administrative & support | 2025 |
| Creative Carpentry Limited | Construction | 2008 |
| Creative Communications Ltd | Professional & scientific | 2023 |
| Creative Consultancy Limited | Professional & scientific | 2025 |
| Creative Crew Studio Ltd | Information & communication | 2023 |