| Coco Collective Group Ltd. | Manufacturing | 2025 |
| Coco Corner Limited | Hospitality | 2018 |
| Coco Gardens Ltd | Hospitality | 2022 |
| Coco Leisure Limited | Hospitality | 2020 |
| Coco on the Hill Ltd | Hospitality | 2023 |
| Coco Pacific Ltd | Manufacturing | 2013 |
| Coco Unisex Hair Studio Limited | Other services | 2010 |
| Cocoblue Ltd | Wholesale & retail | 2024 |
| Cocolooms Limited | Wholesale & retail | 2026 |
| Cocoon Interior Concepts Limited | Other services | 2014 |
| Code Collage Limited | Information & communication | 2014 |
| Code Crafting Minds Ltd | Information & communication | 2024 |
| Code Seven (SP) Limited | Professional & scientific | 2020 |
| Codemaker Consultants Ltd | Information & communication | 2024 |
| Codesplice Ltd | Information & communication | 1996 |
| Codevita UK Ltd | Information & communication | 2020 |
| Codex Infotech Ltd | Information & communication | 2026 |
| Codexive Limited | Information & communication | 2017 |
| Codis Limited | Professional & scientific | 1993 |
| Codomo Limited | Administrative & support | 2002 |
| Codtronix Limited | Information & communication | 2023 |
| COE Management Limited | Hospitality | 2018 |
| Coeus Talent Ltd | Professional & scientific | 2025 |
| Coeus Ventures Ltd | Professional & scientific | 2023 |
| Coffee Corner London Ltd | Hospitality | 2025 |
| Coffee Rush London Ltd | Hospitality | 2020 |
| Coffee Tree Group Limited | Wholesale & retail | 2019 |
| Coforge DPA UK Ltd | Professional & scientific | 2009 |
| COG Labs Ltd | Education | 2021 |
| Cogentech Consulting Limited | Information & communication | 2008 |
| Cognadev Chemistry Ltd | Administrative & support | 2011 |
| Cognit Services Ltd | Professional & scientific | 2024 |
| Cognito Labs Ltd | Information & communication | 2025 |
| Cognus Technology UK Limited | Information & communication | 2019 |
| Coheren Foods Ltd | Hospitality | 2024 |
| Cohousing for ALL Community Interest Company | Extraterritorial | 2024 |
| Cohousing Harrow Limited | Construction | 2020 |
| Coim Limited | Construction | 2026 |
| Coinageofengland Limited | Administrative & support | 2008 |
| Coinnections Ltd | Information & communication | 2024 |
| COJ Carpenter Ltd | Construction | 2016 |
| Cojo Drylining Ltd | Construction | 2022 |
| Cojo Interiors Ltd | Construction | 2019 |
| Cojo&Construct Ltd | Construction | 2023 |
| Cokesimo Limited | Manufacturing | 2023 |
| Colab Online Ltd | Information & communication | 2026 |
| Colab Theatre Ltd. | Arts & recreation | 2013 |
| Colaro Sports International Ltd | Wholesale & retail | 2024 |
| Colbha Limited | Professional & scientific | 2009 |
| Coldharbour Limited | Construction | 2016 |
| Cole & Glynne Residential Ltd | Real estate | 2004 |
| Coliemore Electrical Services Limited | Construction | 2018 |
| Colin 20 Limited | Construction | 2007 |
| Colin 40 Ltd | Other services | 2016 |
| Colin Dinham Plasterer Limited | Construction | 2019 |
| Colin Moone Associates Ltd | Administrative & support | 2011 |
| Colin Wheeler Marketing Limited | Administrative & support | 2011 |
| Colindale Construction Ltd | Construction | 2011 |
| Collab Pictures Ltd | Information & communication | 2023 |
| Collabius Ltd | Information & communication | 2018 |
| Collaborate London Ltd | Professional & scientific | 2009 |
| Collaborate London Trustee Limited | Professional & scientific | 2025 |
| Collaborative Media Advocacy Ltd | Information & communication | 2011 |
| Collected Capital Ltd | Financial services | 2018 |
| Collective Endeavour Limited | Other services | 2025 |
| Collectively Labs Ltd | Administrative & support | 2017 |
| College Avenue Management Limited | Real estate | 1971 |
| College Classics Ltd | Wholesale & retail | 2025 |
| College Hill Investco Limited | Real estate | 2025 |
| Collider Consulting Limited | Real estate | 2021 |
| Collinson Care Ltd | Health & social care | 2010 |
| Colnbrook Car Park Ltd | Real estate | 2024 |
| Colnbrook Car Sales Ltd | Wholesale & retail | 2017 |
| Colnbrook Views Limited | Real estate | 2016 |
| Colne Valley Roofing & Building Limited | Construction | 2021 |
| Colonel Construction Limited | Construction | 2020 |
| Colonial Homes Limited | Real estate | 2001 |
| Colossus Financial Solutions Limited | Financial services | 2019 |
| Colossus Home Solutions Limited | Real estate | 2020 |
| Colossus Solutions Ltd | Information & communication | 2012 |
| Colour Bomb Ltd | Other services | 2018 |
| Colouring Culture Ltd | Information & communication | 2020 |
| Colourpress Limited | Manufacturing | 2004 |
| Coltan Construction Ltd | Construction | 2019 |
| Columbus Investment Group Limited | Real estate | 2020 |
| Columnsafe Ltd | Construction | 2026 |
| COM Catering Limited | Hospitality | 2019 |
| Combined Electricals Limited | Construction | 1993 |
| Combus Limited | Administrative & support | 2007 |
| Combustion Interactive Ltd | Wholesale & retail | 2002 |
| Come & Hire Ltd | Administrative & support | 2025 |
| Come 'N Go Souvlaki Ltd | Hospitality | 2023 |
| Comet Equipment UK PTY Ltd | Wholesale & retail | 2024 |
| Comfort Room & Properties Ltd | Real estate | 2024 |
| Comfy Carpet London Ltd | Wholesale & retail | 2018 |
| Comfy Transport Ltd | Transport & logistics | 2023 |
| Commander Software Limited | Information & communication | 1979 |
| Commandtech CAD & BIM Ltd | Information & communication | 2021 |
| Commercepro Ltd | Information & communication | 2025 |
| Commercial Domestic Property Maintenance Ltd | Construction | 2021 |