| Coln Furniture Ltd | Fairford | 2022 |
| Colne Holdings (2) Limited | Salford | 2025 |
| Colne Holdings Limited | Salford | 2025 |
| Colne Valley Workshops Limited | Slaithwaite | 1982 |
| Colne Way Estate Limited | London | 2019 |
| Cologne IT Ltd | London | 2023 |
| Colombini Asset Management Limited | Turners Hill | 2012 |
| Colombo GIN Company Limited | London | 2014 |
| Colonel Rubber Limited | Lanarkshire | 1935 |
| Colonial Care Limited | Coventry | 2006 |
| Colonial Developments Ltd | Enfield | 2006 |
| Colonial Investments Limited | Crowborough | 2014 |
| Colonsay Cars Ltd | Edinburgh | 2020 |
| Colony Ltd | Isle Of Lewis | 2024 |
| Colophony Logistics Ltd | Launceston | 2024 |
| Coloplast Medical Limited | Peterborough | 2001 |
| Color Confidence Limited | Birmingham | 1981 |
| Color ME Beautiful Ltd | Preston | 2007 |
| Color Trading Co., Ltd | Stafford | 2015 |
| Colorchem Co., Ltd | Ruislip | 2016 |
| Colorful Change Ltd | Manchester | 2024 |
| Colorful Clouds Waves Ltd | London | 2024 |
| Colorful Goblin Ltd. | Uckfield | 2020 |
| Colorful Guppies Ltd | London | 2021 |
| Colorful Home Ltd | London | 2022 |
| Colorful Industry Co., Ltd | London | 2015 |
| Colorgrid Studio Ltd | London | 2025 |
| Colorswoo Group Limited | Beckenham | 2020 |
| Colortrade.Dsf Ltd | London | 2017 |
| Colorweigh Limited | St. Ives | 2019 |
| Colossal Steps Limited | London | 2015 |
| Colosseum Events Limited | London | 2016 |
| Colosseum Limited | Doncaster | 2003 |
| Colour Consultants Limited | London | 2005 |
| Colour Genie Ltd | Wokingham | 2013 |
| Colour ME Beautiful Cosmetics Ltd | Preston | 2015 |
| Colour ME Beautiful Ltd | Preston | 2007 |
| Colourbox Collections Limited | Hampshire | 1999 |
| Colourbyte Limited | Hemel Hempstead | 1998 |
| Coloured Love Ltd | London | 2022 |
| Colourful Ceramics Limited | Battle | 2025 |
| Colourful Coffins Limited | Oxford | 2008 |
| Colourful Zebra Limited | Leigh-On-Sea | 2023 |
| Colourmaster Ltd | Oldham | 2013 |
| Colourprint G.B. Limited | Leicester | 2013 |
| Colours of India Limited | Wellingborough | 1920 |
| Colours of Indo China Ltd. | Wellingborough | 1964 |
| Colourscans Limited | Birmingham | 1996 |
| Colourtone (Taunton) Limited | Cullompton | 2019 |
| Colourwayuk Limited | Seaham | 2019 |
| Colourwise Powder Coaters Limited | Leicester | 1997 |
| Colourxpress Limited | Plympton | 2015 |
| Colposcopy UK Limited | Lincoln | 2005 |
| Colroy Limited | Sheffield | 1966 |
| Colsh Limited | Harrogate | 2025 |
| Colsma International Limited | London | 2015 |
| Colt Industrial Services Limited | Wetherby | 1988 |
| Colt Staplers Limited | Aylesbury | 1988 |
| Coltech Scientific Limited | Bolton | 2008 |
| Colten Care (Construction) Limited | Ringwood | 2008 |
| Colthurst Limited | Harrogate | 2026 |
| Colton Hall Farming Limited | Lichfield | 2012 |
| Coltonsbuys Ltd | Aldershot | 2022 |
| Colts Hill Investments Limited | Tonbridge | 2020 |
| Columba Design Ltd | Ilford | 2019 |
| Columba Systems Holdings Limited | Tonbridge | 2014 |
| Columbia Broadcasting System Holdings UK Limited | London | 2018 |
| Columbia Limited | London | 2015 |
| Columbus Ltd | Epping | 2008 |
| Columbus United Ltd | Windsor | 2023 |
| Colun Limited | Stafford | 2020 |
| Colx Group Ltd | Birkenhead | 2025 |
| Coly Limited | Glasgow | 2014 |
| Colyton Developments Limited | London | 2024 |
| Colyton Investments Limited | London | 2024 |
| COM Ltd | London | 2007 |
| COM Safe Limited | Birmingham | 2010 |
| Com-Part Products Limited | Gosport | 2023 |
| Comael Marine Ltd | London | 2020 |
| Comak Group Limited | Manchester | 2025 |
| Comb & Davidson Limited | Angus | 1997 |
| Combas Farm Ltd | Bristol | 2015 |
| Combat Pilot Ltd | Redditch | 2014 |
| Combat Sports Supplies Ltd | Aberdeen | 2026 |
| Combat Worn Militaria Ltd | London | 2018 |
| Combe HAY Limited | Scarborough | 2024 |
| Comben Group Limited | York | 1924 |
| Comber Distilleries Co. Limited | Newtownards | 1978 |
| Comber Distillery Apartment Ltd | Bangor | 2004 |
| Comber Distillery Management Ltd | Bangor | 2004 |
| Comber View Management (NO.2) Limited | Claudy | 2007 |
| Comber View Management Limited | | 2006 |
| Combicrop Limited | Haverfordwest | 2006 |
| Combilift Ltd | Peterborough | 2015 |
| Combimate Limited | Leeds | 2009 |
| Combined Business Solutions Limited | Shrewsbury Business Park | 2004 |
| Combined Cleaning Ltd | Mitcham | 2024 |
| Combined Enterprises Limited | London | 1989 |
| Combined Funeral Plans Limited | Bolton | 2016 |
| Combined Heating Solutions Ltd | Brightlingsea | 2015 |