| Carbonai Limited | Information & communication | 2025 |
| Carbonsustain Solutions Ltd | Other services | 2023 |
| Carbonyx Ltd | Manufacturing | 2025 |
| Carbooty Music Limited | Arts & recreation | 2014 |
| Carbx Ltd | Professional & scientific | 2025 |
| Carcanet Press Limited | Information & communication | 1971 |
| Carcraft IP Co Limited | Financial services | 2015 |
| Card Empire Ltd | Wholesale & retail | 2022 |
| Card Front Ltd | Wholesale & retail | 2025 |
| Card Programs International Ltd | Information & communication | 2015 |
| Card Trading Centre Ltd | Wholesale & retail | 2025 |
| Cardamom Cream Limited | Other services | 2012 |
| Cardcorp Ltd | Financial services | 2019 |
| Cardea Solutions (UK) Limited | Wholesale & retail | 1997 |
| Cardea Solutions Limited | Professional & scientific | 2006 |
| Cardiac Consultants Limited | Health & social care | 2012 |
| Cardiff Hydraulics Limited | Manufacturing | 2014 |
| Cardiff Retail Assets (NO 2) Limited | Extraterritorial | 2013 |
| Cardiff Retail Assets Limited | Extraterritorial | 2013 |
| Cardiff UNI Market Ltd | Wholesale & retail | 2026 |
| Cardinal Global Ltd | Wholesale & retail | 2025 |
| Cardinal Health Finance | Financial services | 1999 |
| Cardinal House Holdings Ltd | Construction | 2022 |
| Cardinal Maritime Holdings Limited | Financial services | 2012 |
| Cardinal Maritime Property Ltd | Real estate | 2007 |
| Cardinal Rule Ltd | Hospitality | 2023 |
| Cardinky Ltd | Professional & scientific | 2013 |
| Cardiohealth Medical Services Ltd | Health & social care | 2016 |
| Cardiovision Contracting Ltd | Manufacturing | 2025 |
| Cardium Outsourcing Holdings Limited | Financial services | 2022 |
| Cardium Outsourcing Limited | Information & communication | 2004 |
| Cardle Boxing Fitness Limited | Arts & recreation | 2014 |
| Cardnex Ltd | Information & communication | 2026 |
| Cardon Property & Construction Limited | Construction | 2016 |
| Cardona Consulting Ltd | Information & communication | 2013 |
| Cardooo Limited | Extraterritorial | 2014 |
| Cardpay 365 Limited | Information & communication | 2016 |
| Cardsavvy Ltd | Wholesale & retail | 2025 |
| Cardstack Consulting Limited | Wholesale & retail | 2018 |
| Cardy Group Ltd | Manufacturing | 2024 |
| Care (Lancashire) Limited | Health & social care | 2007 |
| Care 1 Solutions Limited | Health & social care | 2020 |
| Care 24 (UK) Limited | Health & social care | 2013 |
| Care 24 Plus Limited | Health & social care | 2023 |
| Care 786 Ltd | Manufacturing | 2020 |
| Care About Money Ltd | Financial services | 2021 |
| Care and Compassion Limited | Health & social care | 2021 |
| Care and Learn Ltd | Education | 2025 |
| Care and Resolve Limited | Health & social care | 2013 |
| Care and Support Ltd | Administrative & support | 2004 |
| Care Bootcamp Limited | Administrative & support | 2020 |
| Care Bridge One Ltd | Health & social care | 2025 |
| Care Claims UK Ltd | Administrative & support | 2026 |
| Care Communication Solution Ltd | Health & social care | 2025 |
| Care Communications Solutions Limited | Information & communication | 2017 |
| Care Crisis Solutions Ltd. | Administrative & support | 2025 |
| Care Daily Ltd | Information & communication | 2025 |
| Care Direct (Salford) Limited | Health & social care | 2005 |
| Care for Feet Chiropody & Podiatry Services Limited | Extraterritorial | 2021 |
| Care for Trading Company Ltd | Wholesale & retail | 2025 |
| Care for YOU Plus Ltd | Administrative & support | 2016 |
| Care Home Core Ltd | Health & social care | 2019 |
| Care in Community CIC | Health & social care | 2025 |
| Care in OUR Hearts Ltd | Health & social care | 2024 |
| Care Management Systems Limited | Information & communication | 2008 |
| Care Manchester Limited | Administrative & support | 2023 |
| Care Market Ltd | Health & social care | 2026 |
| Care Nest Services Limited | Health & social care | 2024 |
| Care Notion Limited | Health & social care | 2019 |
| Care Plus for Physical Therapy Ltd | Other services | 2024 |
| Care Professionals Northwest Ltd | Health & social care | 2024 |
| Care Radio CIC | Information & communication | 2019 |
| Care Rehab Ltd | Health & social care | 2025 |
| Care Resource Limited | Professional & scientific | 2024 |
| Care Station Services Ltd | Hospitality | 2018 |
| Care Success Services Ltd | Health & social care | 2023 |
| Care Supply Service Limited | Health & social care | 2020 |
| Care Support and Domestic Services Limited | Hospitality | 2010 |
| Care Techniques Ltd | Health & social care | 2016 |
| Care to BE Different Limited | Other services | 2018 |
| Care to Success Ltd | Health & social care | 2023 |
| Care Ultrasonics Limited | Manufacturing | 1988 |
| Care Wholesale Limited | Wholesale & retail | 2023 |
| Care Worldwide (Bexhill) Limited | Health & social care | 2024 |
| Care Worldwide (Birmingham) Limited | Health & social care | 2011 |
| Care Worldwide (Bradford) Limited | Health & social care | 2008 |
| Care Worldwide (Carlton) Limited | Health & social care | 2007 |
| Care Worldwide (Castleford) Limited | Health & social care | 2008 |
| Care Worldwide (Devon) Limited | Health & social care | 2007 |
| Care Worldwide (Ilford) Limited | Health & social care | 2026 |
| Care Worldwide (Links) Ltd | Health & social care | 2017 |
| Care Worldwide (London) Limited | Health & social care | 2007 |
| Care Worldwide (Manchester) Limited | Health & social care | 2007 |
| Care Worldwide (Nottingham) Limited | Health & social care | 2011 |
| Care Worldwide (Oldham) Limited | Health & social care | 2008 |
| Care Worldwide (Southwell) Limited | Health & social care | 2011 |
| Care Worldwide (Staffordshire) Limited | Health & social care | 2009 |
| Care Worldwide (Wednesbury) Limited | Health & social care | 2009 |
| Care Worldwide Limited | Health & social care | 1999 |
| Care-About-Me Ltd | Administrative & support | 2026 |