| Collins Property S.W. Ltd | Real estate | 2023 |
| Collins UK Limited | Professional & scientific | 2001 |
| Collinson Tiles (South) Ltd | Wholesale & retail | 1999 |
| Collinson Tiles Limited | Wholesale & retail | 1991 |
| Collision Investigators Limited | Professional & scientific | 1998 |
| Collision Management Centre Limited | Administrative & support | 2021 |
| Collision Science Limited | Administrative & support | 2023 |
| Collistear Hair Ltd | Other services | 2016 |
| Colliver Medical Limited | Health & social care | 2019 |
| Colman Consult Ltd | Construction | 2016 |
| Colman Developments Ltd | Construction | 2026 |
| Colman Group Holdings Ltd | Financial services | 2026 |
| Colman Packaging Ltd | Administrative & support | 2015 |
| Coln at Lakeside Limited | Construction | 2020 |
| Coln at the Knoll Ltd | Construction | 2018 |
| Coln Residential EOT Limited | Financial services | 2025 |
| Coln Residential Limited | Construction | 2009 |
| Coln Signature Homes (Bristol) Limited | Households | 2023 |
| Coln Signature Homes (Churchill) Limited | Construction | 2022 |
| Coln Signature Homes Limited | Construction | 2016 |
| Coln Signature Self Build Limited | Construction | 2025 |
| Colombian HIT Ltd | Wholesale & retail | 2024 |
| Colombini UK Limited | Wholesale & retail | 2013 |
| Colonna London Limited | Hospitality | 2023 |
| Colonnades Dock (RBT) Limited | Real estate | 2025 |
| Colorem Decor Ltd | Construction | 2021 |
| Colour Craft South West Limited | Construction | 2006 |
| Colour Shift Studios Ltd | Wholesale & retail | 2025 |
| Colour Vision U.K Limited | Other services | 2023 |
| Coloured Blocks Limited | Professional & scientific | 2014 |
| Colourful Language Auto Spray Ltd | Professional & scientific | 2023 |
| Colours of Spices Ltd | Hospitality | 2025 |
| Colourway Clothing Limited | Manufacturing | 2011 |
| Colpra Limited | Information & communication | 2016 |
| Colston Court Management Limited | Households | 1975 |
| Colston Glazing Ltd | Construction | 2003 |
| Colston Investments Ltd | Real estate | 2020 |
| Colston Properties Limited | Construction | 2002 |
| Colston Street Management | Households | 2025 |
| Colston's School Foundation | Education | 2009 |
| Colt Seavers Ltd | Professional & scientific | 2022 |
| Colton Properties Ltd | Real estate | 2021 |
| Columbus Twenty Eight Limited | Financial services | 2010 |
| Colvetta Electrical Ltd | Construction | 2023 |
| Colwall Park Property Limited | Real estate | 2025 |
| COM Consulting Ltd | Information & communication | 2017 |
| Comagnify Ltd | Education | 2026 |
| Comal Limited | Construction | 2016 |
| Coman Express Limited | Other services | 2019 |
| Comano Driving Ltd | Transport & logistics | 2015 |
| Combas Farm Ltd | Extraterritorial | 2015 |
| Combat Hire Ltd | Arts & recreation | 2025 |
| Combat Merch Ltd | Wholesale & retail | 2025 |
| Combat Properties Ltd | Real estate | 2026 |
| Combat Vending Ltd | Wholesale & retail | 2025 |
| Combat Warriors Gym Ltd | Arts & recreation | 2020 |
| Combe House Management Company Limited | Households | 2022 |
| Combi-Care Bristol Ltd | Construction | 2024 |
| Combine Testing Ltd. | Information & communication | 2016 |
| Combined Alarms Ltd | Other services | 2021 |
| Combined Building and Electrical Services (UK) Limited | Construction | 1998 |
| Combined Drier Technology Limited | Water & waste | 2016 |
| Combined GAS Services Limited | Construction | 2009 |
| Combitek Limited | Administrative & support | 2018 |
| Come Alive Ltd | Other services | 2004 |
| Come BYE Festival Ltd | Arts & recreation | 2021 |
| Comedy Magic Ltd | Wholesale & retail | 2006 |
| Comedy on Referral CIC | Education | 2023 |
| Comer Property Limited | Real estate | 2023 |
| Comer Travel Limited | Administrative & support | 2024 |
| Comera Accountants Limited | Professional & scientific | 2007 |
| Comera Defence and Ordnance Group Ltd | Financial services | 2025 |
| Comera Energy Limited | Professional & scientific | 2012 |
| Comera Group Limited | Professional & scientific | 2007 |
| Comera Human Performance Group Ltd | Health & social care | 2015 |
| Comera Intelligence Ltd | Information & communication | 2013 |
| Comera Medical Services Limited | Health & social care | 2012 |
| Comera Medical Training Limited | Education | 2013 |
| Comera Movement Science Limited | Education | 1999 |
| Comera Power Limited | Professional & scientific | 2012 |
| Comera Professional Limited | Professional & scientific | 2008 |
| Comera Protective Services Ltd | Administrative & support | 2025 |
| Comera Risk Ltd | Administrative & support | 2013 |
| Comet Game Studio Ltd | Information & communication | 2021 |
| Comfeeds (Ipswich) Limited | Agriculture & fishing | 1984 |
| Comfort Companions C.I.C. | Information & communication | 2016 |
| Comfort Health Limited | Health & social care | 2016 |
| Comfort Physiotherapy Limited | Health & social care | 2013 |
| Comfyjet Limited | Professional & scientific | 2002 |
| Comfykeys Ltd | Real estate | 2026 |
| Comfyrelo Ltd | Real estate | 2024 |
| Comhra Limited | Professional & scientific | 2005 |
| Comins Consultancy Limited | Health & social care | 2026 |
| Comizu Ltd | Wholesale & retail | 2025 |
| Command Alkon UK Limited | Information & communication | 1994 |
| Commander Solutions Ltd | Information & communication | 2018 |
| Commence Studios Ltd | Information & communication | 2020 |
| Commera Limited | Wholesale & retail | 2025 |
| Commerce Expert Ltd | Wholesale & retail | 2025 |
| Commercial Building Maintenance Services Limited | Construction | 2002 |