| Combined Management Services Corporation Limited | Coventry | 1981 |
| Combined Trim Solutions Limited | Rochdale | 2013 |
| Combined Tyres & Autocare Limited | Llandudno | 2009 |
| Comblast Limited | Chichester | 2012 |
| Comblox Ltd | London | 2016 |
| Combo Nation Ltd | London | 2025 |
| Comby (London) Limited | Teddington | 1953 |
| Comdudes Technologies Ltd | Stratford-Upon-Avon | 2022 |
| Come DON Chisciotte Ltd | London | 2022 |
| Come GET ME Taxis Ltd | Newport | 2022 |
| Come on Productions Limited | York | 2012 |
| Comechic Ltd | London | 2024 |
| Comedy Store Management Limited | Great Chesterford | 2000 |
| Comegood Limited | Wolverhampton | 1998 |
| Comenden Wood Limited | Rochester | 1997 |
| Comer Group Limited | London | 2003 |
| Comer Homes Group Limited | London | 2013 |
| Comer Homes Limited | London | 1998 |
| Comer Property Management (Fernhurst) Limited | London | 2023 |
| Comercia Equipment Sales Limited | Northampton | 1991 |
| Comet Environmental Ltd | Sandbach | 2014 |
| Comet Recycling UK Ltd | South Cave | 2019 |
| Comet Sparkle Ltd | London | 2020 |
| Comet Tankers Limited | Beaconsfield | 2003 |
| Comex Civils Limited | Derby | 2019 |
| Comeytrowe Security Trustee Limited | Taunton | 2019 |
| Comfizz Limited | Leeds | 2013 |
| Comforself Health Foods Limited | Cardiff | 2020 |
| Comfort Assured Ltd | Battle | 2014 |
| Comfort Estate Agents Ltd | Nottingham | 2019 |
| Comfort in Chaos Ltd | London | 2025 |
| Comfort Insurance Services Limited | Dagenham | 2003 |
| Comfort Short Stays Ltd | Nottingham | 2019 |
| Comfort Treadmills Ltd | Cleckheaton | 2025 |
| Comfy Hammocks Ltd | Rugby | 2016 |
| Comic World Ltd | Harrogate | 2012 |
| Comida Contracts Limited | Hornchurch | 2025 |
| Comity Property Management Ltd | Steyning | 2021 |
| Comland Co 1 Limited | Bourne End | 2018 |
| Comland Co 2 Limited | Bourne End | 2018 |
| Comland Industrial and Commercial Properties Limited | Bourne End | 1987 |
| Comlink Ltd | London | 2004 |
| Comm Services Limited | East Yorkshire | 1999 |
| COMM2016 Limited | Hinckley | 2016 |
| COMM21 Ltd | Shaftesbury | 2008 |
| Comma Print Limited | Morpeth | 2007 |
| Command Properties Limited | London | 1992 |
| Commander Air-Conditioning Limited | Leigh-On-Sea | 2024 |
| Commander Control Systems Limited | Cotgrave | 2001 |
| Commander Partnership Limited | Sutton Coldfield | 2006 |
| Commarglo Limited | Edinburgh | 2012 |
| Commendatore Ltd | London | 2016 |
| Commeng (Birmingham) Limited | Kidderminster | 2015 |
| Commerce Applied Ltd | London | 2003 |
| Commerce Cherry Ltd | London | 2024 |
| Commerce Court Limited | Bradford | 1992 |
| Commerce NET Ltd | London | 2004 |
| Commerce Services Ltd | London | 2004 |
| Commercia Insights Ltd | Canterbury | 2024 |
| Commercial African Resources Development Limited | London | 1997 |
| Commercial Agents Limited | Harrogate | 2012 |
| Commercial Air Filtration Limited | London | 2013 |
| Commercial and Business Lawyers Limited | Manchester | 2025 |
| Commercial and Legal Services Limited | Colchester | 1999 |
| Commercial ARB Training Ltd | Stafford | 2014 |
| Commercial Automotive Guarantee Corporation Limited | Sevenoaks | 1987 |
| Commercial Bank of London Limited | London | 1994 |
| Commercial Blinds and Curtains Limited | Rochdale | 2021 |
| Commercial Broker Directory Limited | Sheffield | 2024 |
| Commercial Care Plan Limited | Thornbury | 1974 |
| Commercial Catering Equipment Co. (Southern) Limited | Christchurch | 1987 |
| Commercial Coffee Machines Limited | Witney | 2013 |
| Commercial DNA Ltd | Windsor | 2012 |
| Commercial Domestic Property Management Ltd | Harrow | 2021 |
| Commercial Electric Heat Limited | Hawick | 2018 |
| Commercial Finance Credit Limited | London | 1986 |
| Commercial Intertech Holdings Limited | London | 1983 |
| Commercial Intertech Limited | Hemel Hempstead | 1961 |
| Commercial Investment Limited | Surbiton | 1997 |
| Commercial Investment Nominees Ltd | Salford | 2002 |
| Commercial Kitchen Group Ltd | Fair Oak | 2023 |
| Commercial Loans & Investments Limited | Coventry | 2014 |
| Commercial Loans Ltd | Edgware | 2016 |
| Commercial Minds Ltd | Barnet | 2006 |
| Commercial Panels Limited | Northampton | 2015 |
| Commercial Pressings & Panels Limited | Northampton | 2015 |
| Commercial Real Estate Debt Fund (Scotland) GP Limited | Edinburgh | 2014 |
| Commercial Rescue Limited | Harrogate | 2012 |
| Commercial RIB Charter Limited | Lymington | 2021 |
| Commercial Services Group Ltd | Huddersfield | 2025 |
| Commercial Site Services Ltd | Huddersfield | 2025 |
| Commercial Solutions (MC) Ltd | Ilford | 2005 |
| Commercial Street 1975 Limited | Cardiff | 2015 |
| Commercial Tyres OFF Highway Limited | Gateshead | 2013 |
| Commercial Union Life Assurance Company Limited | London | 1904 |
| Commercial Utility Brokers (UK) Ltd. | March | 2010 |
| Commercial Washrooms Ltd | Poole | 2012 |
| Commercial Waste Ltd | Leeds | 2021 |
| Commercial Windows and Business Solutions Limited | Liverpool | 2015 |
| Commercialiser Ltd | Mullion | 2011 |