| Colorway Graphics UK Limited | Manufacturing | 2013 |
| Coloseum Limited | Other services | 2018 |
| Colossium Limited | Other services | 2018 |
| Colour & Works Ltd | Administrative & support | 2011 |
| Colour & Works Projects Ltd | Administrative & support | 2001 |
| Colour Cottage Limited | Manufacturing | 2021 |
| Colour Entertainment Ltd | Other services | 2023 |
| Colour Swatch Ltd | Construction | 2020 |
| Colour Transfers Limited | Manufacturing | 2025 |
| Colourcraft Midlands Ltd | Construction | 2022 |
| Colourmix Limited | Manufacturing | 2019 |
| Colourpoint Litho Limited | Manufacturing | 1973 |
| Colours Creative Fashion Limited | Professional & scientific | 2025 |
| Colours Media Ltd | Manufacturing | 2024 |
| Colours of the Rainbow Ltd | Health & social care | 2020 |
| Colourscans Limited | Extraterritorial | 1996 |
| Colourswift Ltd | Information & communication | 2025 |
| Colro Accounting Ltd | Professional & scientific | 2019 |
| Colstan Profiles Limited | Manufacturing | 1991 |
| Colt Taverns Ltd | Hospitality | 2021 |
| Coltec Finance Company Limited | Financial services | 2002 |
| Coltham Developments (Sambourne) LLP | | 2007 |
| Coltham Developments Limited | Real estate | 1992 |
| Coltham Management Services Ltd | Administrative & support | 2006 |
| Columbia Construction (Midlands) Ltd | Construction | 2009 |
| Columbia Precision Limited | Manufacturing | 1982 |
| Columbia Special Processes Limited | Manufacturing | 2012 |
| Columbus Consultants Limited | Information & communication | 1989 |
| Column 11 Consulting Ltd | Administrative & support | 2025 |
| Column 5 Consulting UK Limited | Professional & scientific | 2008 |
| Columna Protection Ltd | Manufacturing | 2024 |
| Colway UK Limited | Wholesale & retail | 2021 |
| Colyn Elfen PC | | 2018 |
| COM Group Ltd | Information & communication | 2015 |
| COM Safe Limited | Extraterritorial | 2010 |
| Coma Live Limited | Arts & recreation | 2025 |
| Comadd Limited | Real estate | 2000 |
| Comaliveagency Limited | Arts & recreation | 2026 |
| Coman Hvac Ltd | Construction | 2024 |
| Combat Construction Limited | Construction | 2016 |
| Combayti France Ltd | Manufacturing | 2025 |
| Comberton Care Home Limited | Health & social care | 2020 |
| Combi Developments Limited | Construction | 2006 |
| Combined Distribution (Holdings) Limited | Professional & scientific | 1995 |
| Combined Events Management Limited | Administrative & support | 2025 |
| Combined Group Ltd | Wholesale & retail | 2015 |
| Combustion Installations Limited | Wholesale & retail | 1968 |
| Combute LP | | 2011 |
| Comdel Limited | Professional & scientific | 2011 |
| Come to Papa Ltd | Information & communication | 2025 |
| Come-Let-Us Community Project | Hospitality | 2022 |
| Comerford Brickwork Ltd | Construction | 2025 |
| Comesto Services Ltd | Administrative & support | 2019 |
| Comet Midco II Limited | Financial services | 2023 |
| Comet Works Limited | Households | 2020 |
| Comfee Properties Ltd | Real estate | 2020 |
| Comfico Limited | Wholesale & retail | 2023 |
| Comfihomes LMS Ltd | Real estate | 2014 |
| Comfort Coffee Limited | Hospitality | 2025 |
| Comfort Cove Care Limited | Public administration | 2024 |
| Comfort Crest Care Limited | Hospitality | 2025 |
| Comfort Events Limited | Hospitality | 2025 |
| Comfort Holdings Limited | Financial services | 2025 |
| Comfort Homes and Care Limited | Education | 2017 |
| Comfort Inc Ltd | Wholesale & retail | 2022 |
| Comfort Inn Ltd | Hospitality | 2019 |
| Comfort Inn Shelton Ltd | Hospitality | 2019 |
| Comfort Interiors Ltd | Wholesale & retail | 2013 |
| Comfort Ltd Ltd | Hospitality | 2026 |
| Comfort Restaurant Limited | Hospitality | 2025 |
| Comfort Stay Apartments Ltd | Hospitality | 2019 |
| Comfort Travels Salford Limited | Transport & logistics | 2023 |
| Comfort Zone Serviced Apartments Ltd | Hospitality | 2022 |
| Comfortable Housing Limited | Real estate | 2018 |
| Comfortable Property Ltd | Real estate | 2020 |
| Comforter Care Limited | Health & social care | 2022 |
| Comforting Hearts Housing & Support Limited | Hospitality | 2017 |
| Comfy Beds & Furniture Ltd | Wholesale & retail | 2024 |
| Comfy Care U.K Ltd | Health & social care | 2023 |
| Comfy Concepts Ltd | Manufacturing | 2024 |
| Comfy Home Enterprises Limited | Wholesale & retail | 2025 |
| Comfy Housing Ltd | Real estate | 2019 |
| Comfy London Ltd | Wholesale & retail | 2024 |
| Comfy Sofa (Midlands) Ltd | Wholesale & retail | 2025 |
| Comfyy Clothing Ltd | Wholesale & retail | 2024 |
| Comic Enterprises Limited | Arts & recreation | 1994 |
| Comic Limited | Wholesale & retail | 2014 |
| Comm Consulting Limited | Wholesale & retail | 2019 |
| Comma Group Limited | Manufacturing | 2026 |
| Commacross Ltd | Information & communication | 2023 |
| Command Security Group Ltd | Administrative & support | 2025 |
| Commander Industries Ltd | Wholesale & retail | 2026 |
| Commando Cleaning Company Limited | Professional & scientific | 1946 |
| Commbus.Com Limited | Transport & logistics | 2000 |
| Commenciz Ltd | Administrative & support | 2018 |
| Commerce Avenue Limited | Wholesale & retail | 2026 |
| Commerce Global Ventures Ltd | Professional & scientific | 2016 |
| Commerce Intermediatory Ltd | Administrative & support | 2023 |
| Commerce Sense Limited | Professional & scientific | 2013 |
| Commercebyfaisal Limited | Wholesale & retail | 2025 |