| Carrot Town Garage Ltd | Wholesale & retail | 2020 |
| Carrot Town Properties Ltd | Real estate | 2022 |
| Carse Group Ltd | Financial services | 2017 |
| Carse Group Property Ltd | Real estate | 2023 |
| Carter Homes and Management Ltd | Real estate | 2021 |
| Carter Outdoor Pursuits Limited | Hospitality | 2023 |
| Carter Plumbing Ltd | Construction | 2020 |
| Carter Security Solutions Limited | Extraterritorial | 2023 |
| Carter Solutions and Services Limited | Professional & scientific | 2016 |
| Carter Sporting Club Limited | Arts & recreation | 2024 |
| Cartvera Limited | Wholesale & retail | 2026 |
| Cartwix Ltd | Wholesale & retail | 2025 |
| Carvella Investments Limited | Real estate | 2019 |
| Carvella Maintenance Services Limited | Construction | 2016 |
| Caseytech Limited | Information & communication | 2012 |
| Cash Clothes Ltd | Wholesale & retail | 2019 |
| Cashbacs Bureau Limited | Information & communication | 1989 |
| Cashbacs International Limited | Information & communication | 1987 |
| Cat Commercials Ltd | Wholesale & retail | 2019 |
| Category Driver Limited | Extraterritorial | 2023 |
| Cater-Tech Limited | Construction | 2002 |
| Catertec Ltd | Manufacturing | 2003 |
| Cavendish Education Technology (UK) Ltd | Education | 2022 |
| CB International Drilling Ltd | Professional & scientific | 2026 |
| CBA IT Solutions Ltd | Information & communication | 2017 |
| CBD Boarding Limited | Construction | 2024 |
| CC Springador Finance Limited | Professional & scientific | 2024 |
| CCL Training Services Ltd | Education | 2025 |
| Ccrv Ltd | Wholesale & retail | 2014 |
| Cedia UK | Other services | 1997 |
| Centralinc Systems Limited | Information & communication | 1999 |
| Centrebranch Limited | Real estate | 1991 |
| Centuries Invesment Limited | Professional & scientific | 2025 |
| Certification Works Ltd | Professional & scientific | 2025 |
| CEW Asset Management Limited | Administrative & support | 2017 |
| CF Fundraising Ltd | Administrative & support | 2016 |
| Cgipost Ltd | Transport & logistics | 2025 |
| Chad Kebab Limited | Hospitality | 2017 |
| Chainsaw Training UK Limited | Agriculture & fishing | 2017 |
| Chalk Farm Financial Planning Ltd | Professional & scientific | 2017 |
| Chapel Lane Residents Association Limited | Households | 2005 |
| Chapelfield Services Ltd | Water & waste | 2020 |
| Chapman Property Investments Ltd | Real estate | 2025 |
| Charit Systems Ltd | Information & communication | 2022 |
| Charlbrook Holdco Limited | Financial services | 2026 |
| Charlbrook Property Limited | Construction | 2026 |
| Chas's Auto Mobile Limited | Wholesale & retail | 2026 |
| Chassis Alignment Limited | Wholesale & retail | 2002 |
| Chct Installation Ltd | Construction | 2024 |
| Chemical and Agricultural Services Limited | Professional & scientific | 1988 |
| Cherrystone Homes Ltd | Real estate | 2025 |
| Children of GOD Christian Coaching CIC | Education | 2025 |
| China Rose 106 Ltd | Hospitality | 2023 |
| China Rose PE14 Ltd | Hospitality | 2019 |
| Chris Dade Engineering Limited | Manufacturing | 2010 |
| Chris Luff IT Consultants Ltd | Information & communication | 2012 |
| Chris Wiles Damp Proofing Limited | Construction | 2023 |
| Christopher PYE Land and Property Limited | Real estate | 2024 |
| Christos Timber Solutions Ltd | Wholesale & retail | 2019 |
| CIH Enterprises Limited | Financial services | 2024 |
| CIH Property Limited | Real estate | 2024 |
| Cinderoo Ltd | Professional & scientific | 2024 |
| CIS Contracts Limited | Administrative & support | 2019 |
| City Sigma Ltd | Wholesale & retail | 2022 |
| CJ Bathrooms Wetrooms Kitchens Ltd | Construction | 2024 |
| CJB Beauty Limited | Other services | 2024 |
| CKM Homes Limited | Construction | 2025 |
| Clark Decorators Limited | Construction | 2017 |
| Clarke Building Contractors Limited | Construction | 2006 |
| Clarke Denholm Developments Limited | Construction | 2024 |
| Clarke Property Developers Ltd | Construction | 2015 |
| Classic Beauty by Karolina Limited | Other services | 2024 |
| Claud-Bud Ltd | Construction | 2021 |
| Cleaners 5 Star Limited | Administrative & support | 2019 |
| Clever Cookie Holdings Ltd | Financial services | 2022 |
| Cleverbits Limited | Manufacturing | 2011 |
| CLG Heating Solutions Ltd | Construction | 2026 |
| Cliff Top Cafe & Beach Shop Ltd | Hospitality | 2019 |
| Clive Fulcher Consulting Ltd | Professional & scientific | 2023 |
| Clivedon Grove Holdings Limited | Financial services | 2021 |
| CNS Systems (East) Ltd | Other services | 2005 |
| Coach IT Live Ltd | Information & communication | 2021 |
| Coakley Opticians Limited | Wholesale & retail | 2014 |
| Coast and Country Inns Ltd | Hospitality | 2017 |
| Coco Accounting Limited | Professional & scientific | 2021 |
| Coco Unlimited Ltd | Information & communication | 2015 |
| Coins Coins Coins UK Ltd | Wholesale & retail | 2019 |
| Coldham Residents Action Group Limited | Health & social care | 2009 |
| Colin J Ingram Limited | Construction | 2003 |
| College Farm (Firewood) Limited | Wholesale & retail | 2022 |
| Columbus Tours Limited | Administrative & support | 2022 |
| Colville Construction (East Anglia) Limited | Construction | 2015 |
| Colville Construction Limited | Construction | 2009 |
| Comfab UK Ltd | Professional & scientific | 2023 |
| Commercial Bodies & Repairs Ltd | Wholesale & retail | 2022 |
| Commercial Paper Products Ltd | Wholesale & retail | 2025 |
| Complete Proj-X Solutions Limited | Professional & scientific | 2023 |
| Computer Forensics Limited | Information & communication | 2004 |
| Computers & Robots Limited | Professional & scientific | 1985 |
| Comtek Accounts Limited | Information & communication | 1996 |