| Conversify AI Limited | Information & communication | 2024 |
| Conversio Phoenix Limited | Other services | 2024 |
| Conversion 360 Ltd | Information & communication | 2024 |
| Convertfastai Ltd | Professional & scientific | 2026 |
| Converting Tooling Services Limited | Wholesale & retail | 2013 |
| Convertly Systems Ltd | Information & communication | 2026 |
| Conveyancing Expert Limited | Professional & scientific | 2010 |
| Conveyd Legal Ltd | Professional & scientific | 2026 |
| Conveyor and Transmission Services Limited | Manufacturing | 1990 |
| Conveywise Ltd | Administrative & support | 2019 |
| Convinize Trade Limited | Hospitality | 2024 |
| Convise Ltd | Professional & scientific | 2025 |
| Convosoft Ltd | Information & communication | 2023 |
| Conway & Smith Group Limited | Professional & scientific | 2022 |
| Conway Energy NO 2 Limited | Energy | 2007 |
| Conwy Retreats Ltd | Real estate | 2024 |
| Conycares Healthcare Limited | Administrative & support | 2022 |
| Coobuy Limited | Wholesale & retail | 2016 |
| Cook Builders Ltd | Construction | 2025 |
| Cook IT Like YOU Love IT Ltd | Hospitality | 2023 |
| Cook Lawyers Ltd | Professional & scientific | 2016 |
| Cook Nice Ltd | Hospitality | 2024 |
| Cooke Bespoke Carpentry Ltd | Construction | 2025 |
| Cooke Bros Ltd | Wholesale & retail | 2018 |
| Cooke Construction Consultancy Ltd | Construction | 2024 |
| Cooke Haulage Limited | Transport & logistics | 2025 |
| Cooke Management Services Ltd | Professional & scientific | 2011 |
| Cooke Mortgage & Protection Services Ltd | Financial services | 2020 |
| Cookecorp UK Limited | Information & communication | 2019 |
| Cookes Lane Land Limited | Real estate | 2003 |
| Cooki Pets Ltd | Wholesale & retail | 2023 |
| Cookie Dunk Ltd | Hospitality | 2026 |
| Cookie Haven Ltd | Manufacturing | 2020 |
| Cookielicious Ltd | Wholesale & retail | 2003 |
| Cooking Runs Ltd | Hospitality | 2021 |
| Cooks House Ltd | Hospitality | 2023 |
| Cookson Cycles Limited | Wholesale & retail | 2008 |
| Cooksworld Limited | Wholesale & retail | 2007 |
| Cooky Limited | Education | 2023 |
| Cool & Heat Ltd | Manufacturing | 2003 |
| Cool Breed Ltd | Administrative & support | 2024 |
| Cool Club Co Limited | Hospitality | 2023 |
| Cool Colours Limited | Wholesale & retail | 2025 |
| Cool Four Ltd | Real estate | 2024 |
| Cool Jazz Limited | Manufacturing | 2019 |
| Cool Lines Limited | Wholesale & retail | 2014 |
| Cool Logic (Service) Limited | Manufacturing | 1999 |
| Cool Meao Ltd | Wholesale & retail | 2025 |
| Cool Service Installations Limited | Construction | 2015 |
| Cool Stars | Other services | 2010 |
| Cool TAN 2017 Limited | Other services | 2017 |
| Cool Tree Limited | Wholesale & retail | 2025 |
| Cooler Projects Community Interest Company | Professional & scientific | 2009 |
| Coolfreeze UK Limited | Manufacturing | 2003 |
| Coolify Air Conditioning Ltd | Energy | 2025 |
| Cooling 2K Ltd | Construction | 2011 |
| Cooling and Cooling Ltd | Manufacturing | 2018 |
| Coologix AI Ltd | Information & communication | 2025 |
| Coolsites Media Limited | Information & communication | 2013 |
| Cooltech Trade Limited | Wholesale & retail | 2021 |
| Cooltone Ltd | Wholesale & retail | 2008 |
| Coope Plumbing and Heating Ltd | Construction | 2024 |
| Cooper Commercial Consultants Limited | Professional & scientific | 2013 |
| Cooper Seven Estates Limited | Real estate | 2025 |
| Cooper ST Commercial Ltd | Households | 2025 |
| Cooper Winford Ltd | Education | 2020 |
| Cooper-Wood Estates Limited | Real estate | 2026 |
| Cooperativa Aurora Alimentos Ltd | Wholesale & retail | 2024 |
| Cooperman Cleaning Solutions UK Ltd | Administrative & support | 2017 |
| Coopermoss Limited | Real estate | 2023 |
| Coopers (Metals) Limited | Professional & scientific | 1946 |
| Coopers (Southwick) Ltd | Wholesale & retail | 2019 |
| Coopers Care UK Ltd | Administrative & support | 2019 |
| Coopers Fancy Dress Ltd | Manufacturing | 2010 |
| Coopers Roofing Contractors Ltd. | Construction | 2019 |
| Coopers Safety at Height Ltd | Construction | 2025 |
| Coopers Sandwich Bar Ltd | Hospitality | 2024 |
| Coordinated Security Ltd | Administrative & support | 2012 |
| Coordinated Security Solutions Ltd | Administrative & support | 2020 |
| Coore Services (Manchester) Limited | Professional & scientific | 2026 |
| Copa Accounting Ltd | Professional & scientific | 2021 |
| Copa Group Ltd | Financial services | 2024 |
| Copa Payroll Ltd | Construction | 2025 |
| Copa Tax Ltd | Professional & scientific | 2023 |
| Copacetic Grail Ltd | Information & communication | 2020 |
| Copco Limited | Manufacturing | 2022 |
| Cope Engineering (Rollmakers) Limited | Manufacturing | 2008 |
| Cope Family Properties Limited | Real estate | 2017 |
| Cope Properties Limited | Real estate | 2016 |
| Coperceptuo Limited | Information & communication | 2022 |
| Copernicus International Consulting Ltd | Professional & scientific | 2009 |
| Copes Coins Limited | Wholesale & retail | 2020 |
| Copper & Blossom Ventures Ltd | Information & communication | 2022 |
| Copper Dragon Brewery Limited | Financial services | 2016 |
| Copper Leaf Advisory Team Ltd | Extraterritorial | 2026 |
| Copper Media Limited | Professional & scientific | 2010 |
| Copper Ridge Trading Solutions Ltd | Extraterritorial | 2026 |
| Copperbeech Consulting Limited | Professional & scientific | 2006 |
| Copperbrook Limited | Households | 1982 |
| Coppercore Solutions Ltd | Construction | 2026 |