| Coffee & Traditions Limited | Hospitality | 2013 |
| Coffee 7 Ltd | Hospitality | 2024 |
| Coffee Corner & Deli Ltd | Hospitality | 2024 |
| Coffee Global Limited | Financial services | 2005 |
| Coffee Montero UK Limited | Hospitality | 2013 |
| Coffee Penguin Limited | Hospitality | 2019 |
| Coffee Rafiki Ltd | Wholesale & retail | 2024 |
| Coffee Tech Industries Ltd | Manufacturing | 2021 |
| Coffeexclusive Limited | Transport & logistics | 2006 |
| COG Commercial Property Ltd | Transport & logistics | 2025 |
| Cogan Learning Solutions Ltd | Professional & scientific | 2026 |
| Cogent Insurance Services Limited | Financial services | 2014 |
| Cogent Mechatronic Group Limited | Financial services | 2021 |
| Cogent Steel Ltd | Wholesale & retail | 2018 |
| Cogill Groundworks Ltd | Construction | 2026 |
| Cogniris Ltd | Information & communication | 2018 |
| Cognisys Group Limited | Information & communication | 2017 |
| Cognitionx Ltd | Administrative & support | 2015 |
| Cognito Group Ltd | Construction | 2022 |
| Cogniworks Limited | Information & communication | 2013 |
| Cognixion Ltd | Wholesale & retail | 2025 |
| Cognize Corporation Ltd | Information & communication | 2023 |
| Cognize Estates Limited | Real estate | 2026 |
| Cognize Holdings Ltd | Financial services | 2026 |
| Cognni Limited | Information & communication | 2019 |
| Cohen & Co. Ltd. | Administrative & support | 2012 |
| Cohen Cramer Limited | Extraterritorial | 2013 |
| Coherent Flux Limited | Manufacturing | 2025 |
| Cohesivedev Ltd | Information & communication | 2019 |
| Col-Sec UK Ltd | Administrative & support | 2009 |
| Col-Tec Electrical Contractors Ltd | Construction | 2021 |
| Colchour Limited | Financial services | 2017 |
| Cold Frosty Morning Ltd | Information & communication | 2022 |
| Cold Spring Gardens Limited | Manufacturing | 2019 |
| Cold Water Storage Limited | Professional & scientific | 2015 |
| Colden Landscapes Company Limited | Construction | 2008 |
| Coldfire Branding Limited | Administrative & support | 2019 |
| Cole & Jones Ltd | Information & communication | 2020 |
| Coleeds Limited | Arts & recreation | 2023 |
| Coleman Cabinets Limited | Water & waste | 1998 |
| Coleman Capital LLP | | 2013 |
| Coleman Electrical and Security Ltd | Construction | 2023 |
| Colemann & Wells Ltd | Wholesale & retail | 2015 |
| Colemans Steel Ltd | Manufacturing | 2021 |
| Colfax Window Systems Limited | Construction | 1987 |
| Colin Barker Services Ltd | Administrative & support | 2025 |
| Colin Howley Limited | Professional & scientific | 2017 |
| Colin S Charlesworth and Partners Limited | Professional & scientific | 2015 |
| Colin Stevens Forestry Limited | Agriculture & fishing | 2010 |
| Colin Woolner Decorators Limited | Construction | 2005 |
| Colink Services Limited | Health & social care | 2016 |
| Coll Search Limited | Administrative & support | 2023 |
| COLL-8 Logistics UK Limited | Transport & logistics | 2019 |
| Collab Leeds Ltd | Hospitality | 2022 |
| Collaborative Education Support Ltd | Education | 2021 |
| Collaborative Services Support (NE) Holdings Limited | Professional & scientific | 2009 |
| Collaborative Services Support NE Limited | Construction | 2009 |
| Collateral Labs Ltd | Professional & scientific | 2025 |
| Collective Ambition Limited | Professional & scientific | 2024 |
| Collective Engineering Ltd | Manufacturing | 2026 |
| Collective Print Management Services Ltd | Professional & scientific | 2012 |
| Collective Resource Limited | Professional & scientific | 2012 |
| Collectivehairstudios Ltd | Other services | 2022 |
| Collectix Ltd | Wholesale & retail | 2025 |
| College Grove Court Management Company Limited | Households | 1984 |
| College Grove Developments Ltd | Real estate | 2022 |
| College Grove Properties Ltd | Real estate | 2020 |
| College of Legal Practice Limited | Education | 2018 |
| Colley Gardens (Stanley) Limited | Households | 2007 |
| Collier Manchester Limited | Professional & scientific | 2008 |
| Collier Services (UK) Ltd | Administrative & support | 2012 |
| Collingrove Limited | Wholesale & retail | 1993 |
| Collingwood Projects 2 Limited | Arts & recreation | 2026 |
| Collingwood Projects Limited | Real estate | 2018 |
| Collingwood Property Holdings Ltd | Real estate | 2025 |
| Collinn Limited | Wholesale & retail | 2025 |
| Collins (Pontefract) Limited | Extraterritorial | 1985 |
| Collins Pharmacy (Nottingham) Limited | Health & social care | 1986 |
| Collinson's CUT Soles Limited | Professional & scientific | 1920 |
| Collision Forensics Ltd | Professional & scientific | 2017 |
| Colman Engineering Ltd | Wholesale & retail | 2026 |
| Colmore Innovations Limited | Information & communication | 2021 |
| Colne Investments 2 Holdco Limited | Administrative & support | 2014 |
| Colne Investments 2 Limited Partnership | | 2015 |
| Colne Topco Limited | Administrative & support | 2014 |
| Colne Valley Contractors Limited | | 1982 |
| Colombo Bidco Limited | Financial services | 2018 |
| Colombo Holdco Limited | Financial services | 2018 |
| Colombo Investment Holdings Limited | Financial services | 2019 |
| Coloniesonline Limited | Information & communication | 2013 |
| Colorful Catering Ltd | Manufacturing | 2024 |
| Colosseum Leisure Limited | Arts & recreation | 1991 |
| Colour Copy Leeds Limited | Manufacturing | 2023 |
| Colour Crew Painters & Decorators Ltd | Construction | 2023 |
| Colour Intelligence Ltd | Professional & scientific | 2021 |
| Colour Match UK Ltd | Manufacturing | 2004 |
| Colour Optic Ltd | Wholesale & retail | 2015 |
| Colour Zone Trading Ltd | Wholesale & retail | 2016 |
| Coloured Boxes Limited | Real estate | 2007 |
| Colourfull Kitchens Limited | Other services | 2014 |