| Coltunach Limited | Poole | 2025 |
| Colucci's Barber Shop Ltd | Brackley | 2018 |
| Columba 1400 | Isle Of Skye | 1997 |
| Columba 1400 Staffin Limited | Isle Of Skye | 2006 |
| Columbanus Enterprises Limited | Belfast | 1988 |
| Columbia Estates Limited | London | 1993 |
| Columbia Group PLC | London | 1998 |
| Columbia Management Ltd | Worthing | 2025 |
| Columbia Ravenscroft Limited | London | 2017 |
| Columbia Road Market Traders Group Ltd | Bishop'S Stortford | 2020 |
| Columbia Threadneedle Foundation | London | 2013 |
| Columbia Threadneedle Investment Business Limited | Edinburgh | 1994 |
| Columbia Threadneedle Pullman Promote Limited | London | 2026 |
| Columbia UK Fund Limited | London | 2005 |
| Columbine Cleaners Ltd | Manchester | 1923 |
| Columbus Forty Four Limited | Cardiff | 2016 |
| Columbus Legal Limited | Glasgow | 2012 |
| Colvin Memorial Temple Limited | Clacton On Sea | 1954 |
| Colw | Dereham | 2012 |
| Colwall Community Church | Malvern | 2011 |
| Colwall Orchard Trust | Malvern | 2011 |
| Colwick Vale Coachworks Limited | Nottingham Business Park | 1961 |
| Colwyn Bay Hand CW Limited | Mochdre | 2026 |
| Colwyn Corn Supplies Ltd | St. Asaph | 2021 |
| Colwyn Victoria Pier Trust Ltd | Bae Colwyn | 2011 |
| Colyer Phillips Ltd | Woking | 2015 |
| Colyer Repropoint Ltd | Woking | 2016 |
| COM Church | Dunstable | 2017 |
| COM Cubed Ltd | | 1997 |
| Com-Unity AI Ltd | Worcester Park | 2025 |
| COM2CART Ltd | Middlesbrough | 2020 |
| Coma Holdings Ltd | Chippenham | 2017 |
| Comac Consulting Ltd | Motherwell | 2019 |
| Comak Limited | Dagenham | 2015 |
| Coman Express Limited | Bristol | 2019 |
| Comart Autoclaves Limited | Rotherham | 2014 |
| Comason Beauty & Training Ltd | Salisbury | 2021 |
| Comax Hair Ltd | Clitheroe | 2025 |
| Comaza Ltd | Telford | 2019 |
| Comb and Go Hairdresser Ltd | London | 2026 |
| Comb N Clippers Ltd | London | 2022 |
| Combat Academy for Sports Limited | Leigh-On-Sea | 2018 |
| Combat Fire Limited | Leighton Buzzard | 2006 |
| Combat Pest Solutions Ltd | Aldermaston | 2018 |
| Combating Poverty Through Education | London | 2011 |
| Combatix Ltd | Bury St. Edmunds | 2025 |
| Combe Down (Bath) Allotments CIC | Bath | 2025 |
| Combe Linen Services Ltd | Ilfracombe | 2021 |
| Comber Regeneration Community Partnership Ltd. | Newtownards | 2004 |
| Combers Limited | Taunton | 2004 |
| Combes Services Ltd | Sheffield | 2019 |
| Combesgate Capital Limited | Warmley | 2024 |
| Combi Nation Solution Ltd | Northampton | 2009 |
| Combi-Nation Commercial Ltd | Southampton | 2011 |
| Combicom Ltd | Paisley | 2018 |
| Combidrive Limited | Carmarthen | 1975 |
| Combifix Service & Repairs Ltd | Lutterworth | 2014 |
| Combine Performance Limited | Leeds | 2019 |
| Combined Alarms Ltd | Bristol | 2021 |
| Combined Heat and Power Association Ltd | London | 2014 |
| Combined Independents (Liverpool) Limited | Liverpool | 1972 |
| Combined Parking Solutions Limited | Kington | 2012 |
| Combined Playground Services Ltd | Oakdale | 2007 |
| Combined Touch Community Interest Company | Jarrow | 2015 |
| Combined Utilities (Hartlepool) Ltd | Hartlepool | 2019 |
| Combined Utilities Group Limited | Hartlepool | 2022 |
| Combitec Limited | Pershore | 1990 |
| Combustion Services Limited | | 2008 |
| Comchip Europe International Holding Limited | Hythe | 2024 |
| Comchip Europe International Limited | Hythe | 2024 |
| Comcure Tech Solutions Limited | Barry | 2024 |
| Come & Drive Limited | Romford | 2014 |
| Come Alive Ltd | Bristol | 2004 |
| Come Back Circle CIC | Wolverhampton | 2023 |
| Come Outside Dogs Ltd | Norwich | 2024 |
| Come Repair Ltd | London | 2019 |
| Come Shine With ME Limited | Dunfermline | 2010 |
| COME2ENGLAND Ltd | London | 2012 |
| Comedy Care Collective CIC | Liverpool | 2026 |
| Comedy Clubs Limited | Poole | 2005 |
| Coment Group Ltd | Stoke-On-Trent | 2017 |
| Comer Farm Limited | Stirling | 2022 |
| Comet Alliance Ltd | Bognor Regis | 2024 |
| Comet Bidco Limited | London | 2017 |
| Comet Classics Limited | Gosport | 2014 |
| Comet Cleaners Limited | Bromley | 2009 |
| Cometgold Limited | Cardiff | 2004 |
| Comficare Limited | South Molton | 1994 |
| Comform Solutions Limited | London | 2007 |
| Comfort & Energy Ltd | London | 2025 |
| Comfort AC and Heating Limited | Wembley | 2025 |
| Comfort Blinds Factory Ltd | Oldham | 2019 |
| Comfort Business Ventures Ltd | Forest Gate | 2017 |
| Comfort Car Services Ltd | London | 2018 |
| Comfort Care (Truro) Limited | Falmouth | 2012 |
| Comfort Fishing Company Limited | Peterhead | 2012 |
| Comfort Forever Limited | Leeds | 2025 |
| Comfort Frame Ltd | London | 2020 |
| Comfort Group of Companies Ltd | London | 2021 |
| Comfort Hampers Ltd | Buckingham | 2015 |