| Cochran Delivery Ltd | Transport & logistics | 2024 |
| Cockhedge Health Care Limited | Other services | 2016 |
| Cockhedge Medical Centre Limited | Health & social care | 2007 |
| Coco Aesthetics & Skin Ltd | Other services | 2016 |
| Coco Baroque Limited | Hospitality | 2023 |
| Coco Beach Saddleworth Ltd | Other services | 2024 |
| Coco Fresh Fruit & Grocery Limited | Wholesale & retail | 2020 |
| Cocreate Health Consultancy Ltd | Professional & scientific | 2025 |
| Code 1 Holdings Limited | Professional & scientific | 2023 |
| Code 360 Ltd | Information & communication | 2015 |
| Code Building Solutions Limited | Construction | 2015 |
| Code Red Limited | Transport & logistics | 2009 |
| Codebake Ltd | Information & communication | 2019 |
| Codebox Development Limited | Information & communication | 2012 |
| Coded Car Keys Limited | Wholesale & retail | 2012 |
| Codedtea Ltd | Information & communication | 2025 |
| Codenutri Ltd | Information & communication | 2026 |
| Codesolve Limited | Information & communication | 2018 |
| Codewithtase Limited | Information & communication | 2021 |
| Codo Projects Ltd | Real estate | 2022 |
| Codo Services Limited | Construction | 2026 |
| Codringher & Fenn Limited | Administrative & support | 2023 |
| COE Investments Ltd | Real estate | 2021 |
| Coeus Insurance Management Limited | Financial services | 2012 |
| Coeus Wealth Management Ltd | Financial services | 2014 |
| Coffeaco 90 Limited | Wholesale & retail | 1991 |
| Coffee & Fandisha Limited | Hospitality | 2014 |
| Coffee Fuelled Ltd | Information & communication | 2013 |
| Coffee Wave Group Limited | Hospitality | 2024 |
| Coffey Legal Services Ltd | Professional & scientific | 2023 |
| Cofoundery Enterprise 44 Ltd | Administrative & support | 2017 |
| COG Services Limited | Other services | 2016 |
| Cogar Hospitality Ltd | Hospitality | 2026 |
| Cogar Property Group Ltd | Real estate | 2022 |
| Cogita Development Limited | Professional & scientific | 2018 |
| Cognitia Holdings Limited | Information & communication | 2026 |
| Cogs Education CIC | Education | 2018 |
| COI Cleaning Company Ltd | Administrative & support | 2026 |
| Coindragon Limited | Real estate | 2008 |
| Coinglow Limited | Financial services | 1983 |
| Colbier Brewery Ltd | Manufacturing | 2023 |
| Colby Medical Centre Limited | Health & social care | 2006 |
| Colby Wines Ltd | Wholesale & retail | 2023 |
| Cold Change Group Limited | Manufacturing | 2024 |
| Cold Sea Ltd | Transport & logistics | 2019 |
| Coldstone Legal Limited | Professional & scientific | 2018 |
| Cole Music Productions (UK) Limited | Arts & recreation | 1994 |
| Coleman Paving & Civils Ltd | Construction | 2021 |
| Colemans Fireproof Depository RTM Company Limited | Extraterritorial | 2021 |
| Colens South Liverpool Ltd | Wholesale & retail | 2022 |
| Coles Commercial Properties Limited | Real estate | 2025 |
| Coles Farm One Trading Limited | Professional & scientific | 2017 |
| Coles Farm Two Trading Limited | Professional & scientific | 2017 |
| Coles Heating and Plumbing Services Ltd | Construction | 2018 |
| Coles Housing Limited | Real estate | 2025 |
| Colette Fulham Road Ltd | Wholesale & retail | 2018 |
| Colette Northcote Road Limited | Wholesale & retail | 2021 |
| Colette Wimbledon Limited | Wholesale & retail | 2021 |
| Colhoun One Trading Limited | Professional & scientific | 2016 |
| Colhoun Two Trading Limited | Professional & scientific | 2016 |
| Colin Baker Ltd | Transport & logistics | 2023 |
| Colin Bennett Decorator Limited | Construction | 2019 |
| Colin Darracott Limited | Construction | 2011 |
| Colin Jones Consultancey Ltd | Professional & scientific | 2024 |
| Colin Parr Joinery Ltd | Construction | 2026 |
| Colin Rice Ltd | Wholesale & retail | 2025 |
| Colin Rogers Consulting Limited | Professional & scientific | 2016 |
| Colin Winder Properties Limited | Real estate | 2025 |
| Colin’S Custom Built Rods Ltd | Agriculture & fishing | 2025 |
| Collaboraite Ltd | Information & communication | 2021 |
| Collaborate Digital Ltd | Education | 2017 |
| Collaboration Media Limited | Professional & scientific | 2021 |
| Collaborative Contract Solutions Limited | Real estate | 2009 |
| Collaboritise Advisory Limited | Professional & scientific | 2026 |
| Collateral (UK) Limited | Financial services | 2014 |
| Collateral Sales Limited | Financial services | 2016 |
| Collateral Security Trustee Limited | Financial services | 2016 |
| Collateral Thinking Limited | Professional & scientific | 2020 |
| Collect and Survive Ltd | Wholesale & retail | 2019 |
| Collective Bars Ltd | Hospitality | 2024 |
| Collective Care (NW) Ltd | Administrative & support | 2023 |
| Collective Encounters | Arts & recreation | 2004 |
| Collective Property Co (NW) Limited | Real estate | 2018 |
| Collective Property Management Limited | Real estate | 2025 |
| Collectors DEN Ltd | Wholesale & retail | 2020 |
| Collectors Tavern Limited | Wholesale & retail | 2025 |
| Collectors Universe TCG Ltd | Wholesale & retail | 2025 |
| COLLEENBROOKES1992 Limited | Administrative & support | 2017 |
| College 150 Limited | Wholesale & retail | 2013 |
| College Cycles L23 Ltd | Wholesale & retail | 2022 |
| College Cycles Limited | Wholesale & retail | 2002 |
| College Green RTM Company Limited | Households | 2022 |
| College Properties Limited | Real estate | 1997 |
| Collegiate Management Limited | Households | 2000 |
| Collett & Co. Site Solutions Ltd | Construction | 2025 |
| Collette Duffy Ltd | Wholesale & retail | 2003 |
| Collex UK Ltd | | 2008 |
| Colliers Executive Travel Ltd | Transport & logistics | 2025 |
| Collings Heating Ltd | Construction | 2023 |
| Collingwood Boat Builders Ltd | Manufacturing | 2003 |