| Cobalt Star Ltd | Administrative & support | 2010 |
| Cobalt Thoroughbreds Limited | Agriculture & fishing | 2025 |
| Cobas (UK) Limited | Wholesale & retail | 2002 |
| Cobra Scaffolding Ltd | Construction | 2014 |
| COBRA-1313 Ltd | Transport & logistics | 2013 |
| Cocciuto Limited | Hospitality | 2025 |
| Cochranehodgson Ltd | Financial services | 2023 |
| Cocitoo Limited | Wholesale & retail | 2022 |
| Cockayne Group Ltd | Hospitality | 2025 |
| Cocker Beck Business Services Limited | Professional & scientific | 2014 |
| Cockliffe House Hotel Limited | Extraterritorial | 2014 |
| Coco & Rolf Ltd | Wholesale & retail | 2022 |
| Coco & Sainu Limited | Hospitality | 2025 |
| Coco Bharat Ltd | Wholesale & retail | 2025 |
| Coco Coffee Shop Limited | Hospitality | 2023 |
| Coco Creams HR Ltd | Hospitality | 2026 |
| Cocoa & Crumbs Bakery Ltd | Manufacturing | 2026 |
| Cocori Construct Ltd | Construction | 2023 |
| Coda Education Ltd | Information & communication | 2015 |
| Code & Clause Legal Ltd | Information & communication | 2025 |
| Code 3 Research Limited | Information & communication | 2011 |
| Code 4 Systems Limited | Information & communication | 1999 |
| Code 9 Pineapple Holdings Limited | Real estate | 2015 |
| Code Collaboration Ltd | Information & communication | 2025 |
| Code Horizon Limited | Information & communication | 2024 |
| Code Miners Limited | Information & communication | 2011 |
| Code Mruda Ltd | Wholesale & retail | 2026 |
| Code Print Limited | Administrative & support | 2010 |
| Code Property Investments Limited | Construction | 2020 |
| Code Red Associates Ltd | Information & communication | 2009 |
| Code Red Period Products Ltd | Wholesale & retail | 2022 |
| Code Right Limited | Information & communication | 2011 |
| Codean Properties Limited | Construction | 2000 |
| Codebrush Limited | Information & communication | 2005 |
| Codedox Ltd | Information & communication | 2024 |
| Codify Limited | Information & communication | 2024 |
| Codnor Park 5PT Limited | Real estate | 2011 |
| Codnor Tandoori Limited | Hospitality | 2018 |
| Codnor Tandoori Takeaway Ltd | Hospitality | 2026 |
| Codur Consultancy Ltd | Wholesale & retail | 2021 |
| COE and COE Properties Ltd. | Real estate | 2018 |
| COE Properties Ltd | Real estate | 2018 |
| Coenseo Ltd | Professional & scientific | 2016 |
| Coepi Consulting Limited | Other services | 2012 |
| Cofa Properties Limited | Real estate | 2020 |
| Coffee Central Limited | Wholesale & retail | 2003 |
| Coffee Cream Ltd | Hospitality | 2026 |
| Coffee Farm Ltd | Hospitality | 2025 |
| Coffee Next Door Limited | Hospitality | 2026 |
| Coffee Sound & Vision Ltd | Hospitality | 2024 |
| Coffee Vida Limited | Hospitality | 2016 |
| Coffeeluck Ltd | Professional & scientific | 2023 |
| COG Homes Limited | Real estate | 2017 |
| COG Property Solutions Ltd | Real estate | 2025 |
| COGENT2 Limited | Information & communication | 2024 |
| Coggan Creative Limited | Professional & scientific | 2022 |
| Cognos 360 Limited | Information & communication | 2018 |
| Cognosis Games Limited | Manufacturing | 2011 |
| Cohen & Sons (UK) Limited | Real estate | 2025 |
| Cohor Construction Ltd | Construction | 2025 |
| Cohost Partners Ltd | Real estate | 2023 |
| Coinmaker Limited | Households | 1987 |
| Cojan Logistics Ltd | Transport & logistics | 2022 |
| Cojocaru Gheorghe Ltd | Administrative & support | 2022 |
| Cojxadamxannais Ltd | Transport & logistics | 2025 |
| Colaunch Limited | Information & communication | 2018 |
| Colbeck & Co Ltd | Professional & scientific | 2001 |
| Cold Brewed Ltd | Information & communication | 2024 |
| Cold Culture Ltd | Wholesale & retail | 2025 |
| Cold Developments Limited | Other services | 2014 |
| Colden Nottingham Limited | Construction | 2012 |
| Coldroom-Rental Limited | Administrative & support | 2022 |
| Coleby Associates LLP | | 2012 |
| Coleflax Bennett Design Ltd | Professional & scientific | 2021 |
| Colerangle Ltd | Information & communication | 2013 |
| Coles and Oldham Properties Ltd | Real estate | 2026 |
| Coles Sewing Centre Ltd | Wholesale & retail | 2011 |
| Coleshaw Property Services Ltd | Administrative & support | 2019 |
| Coleson and Company (Bakers) Limited | Hospitality | 1952 |
| Colin Beecham (1985) Limited | | 1985 |
| Colin Bowers & SON Limited | Construction | 2003 |
| Colin Burnett Limited | Real estate | 1988 |
| Colin Cotter Limited | Professional & scientific | 1997 |
| Colin Currie Group Ltd | Arts & recreation | 2023 |
| Colin Davies Software Consultancy Limited | Information & communication | 2021 |
| Colin Greatorex Limited | Professional & scientific | 2014 |
| Colin Reid Bespoke Furniture Ltd | Manufacturing | 2021 |
| Colitant Global Ltd | Administrative & support | 2025 |
| Collaboratrix Ltd | Professional & scientific | 2017 |
| Collared Close Management Ltd | Households | 2024 |
| Collata Live Ltd | Hospitality | 2020 |
| Collate Design Ltd | Professional & scientific | 2017 |
| Collconn Limited | Real estate | 2017 |
| Collect a Card Ltd | Wholesale & retail | 2021 |
| Collective Attire Ltd | Wholesale & retail | 2026 |
| Collective Solutions Group Ltd | Information & communication | 2017 |
| Collective-Security Ltd | Information & communication | 2018 |
| Collectors Vault Ltd | Wholesale & retail | 2025 |
| College Street Northampton LLP | | 2024 |
| College Street Northampton Management Limited | Real estate | 2025 |