| Consett Ales Limited | Belmont | 2023 |
| Consett Print Services Ltd. | Durham | 2017 |
| Consett Steel Works Ltd | Consett | 2021 |
| Consider IT Pimped Ltd. | Wareham | 2010 |
| Consider This Limited | Walton-On-Thames | 2008 |
| Considerate Builders Limited | London | 2026 |
| Considered Nutrition Ltd | London | 2026 |
| Considerit Chocolate Ltd | Rosyth | 2020 |
| Consilio Lighting Ltd | St. Albans | 2019 |
| Consilium Safety UK Ltd | East Kilbride | 2021 |
| Conskog Limited | Widnes | 2010 |
| Conso Investment Limited | London | 2016 |
| Consol Machining Limited | Alcester | 2025 |
| Console Portal Ltd | Leeds | 2018 |
| Consolidate Enterprises Limited | London | 2006 |
| Consolidated Engineering and Marine Limited | Loughborough | 1991 |
| Consolidated Fruit Co. Limited | Brough | 1942 |
| Consolidated Irish Whiskey Limited | Neston | 2024 |
| Consolidated Manufacturing Corporation Limited | Cardiff | 1989 |
| Consolidated Medical Industries Limited | Bracknell | 1980 |
| Consolidated Plastics Limited | Shefford | 2017 |
| Consolidated Rail Ltd | Towcester | 2019 |
| Consolidated Steel Products Ltd. | West Midlands | 1997 |
| Consolidated Tech Ltd | London | 2022 |
| Consolite Technology Limited | Bath | 1980 |
| Consolor Limited | West Drayton | 2006 |
| Consort (1996) Limited | Dyfed | 1996 |
| Consort Engineering (Ashton-U-Lyne) Limited | 76 Currier Lane | 1972 |
| Consort Equipment Products Limited | Milford Haven | 1996 |
| Consort Limited | Nottinghamshire | 1981 |
| Consort Media Limited | Hemel Hempstead | 2015 |
| Consort Medical Limited | Cheadle | 1946 |
| Consortium Designs Limited | North Chingford | 1991 |
| Consortium Jewellery Limited | Birmingham | 1986 |
| Conspiracy (Multimedia) Limited | Edgware | 1997 |
| Conspiriti Ltd | London | 2020 |
| Constable Stonework Limited | Aberuthven | 2026 |
| Constant Candle Company Limited | West Molesey | 2021 |
| Constant Fibreglass Limited | Dartford | 2011 |
| Constant Group Holdings Limited | Oldham | 2019 |
| Constant Group Ltd | Oldham | 1970 |
| Constant Power Solutions Ltd | Selby | 2013 |
| Constant Precision Ltd | Buckingham | 2013 |
| Constant Systems Limited | Daventry | 1989 |
| Constanteq Limited | London | 2026 |
| Constantia FFP Limited | Northampton | 1966 |
| Constantia Sittingbourne Limited | Sittingbourne | 1995 |
| Constantin Chivu Ltd | Cambridge | 2025 |
| Constantin Mihai Ltd | Cambridge | 2025 |
| Constantin Ovidiu Limited | Birmingham | 2022 |
| Constantin Prints Ltd | Milton Keynes | 2021 |
| Constantine Media Ltd | Stockton-On-Tees | 2021 |
| Constantine Real Estate Ltd. | Southwick | 2011 |
| Constantinobuilding Limited | Luton | 2024 |
| Constanus (Scotland) Limited | Glasgow | 2013 |
| Constanus Limited | London | 2013 |
| Constell Engineers Limited | Lancashire | 1998 |
| Constellation Chemicals Ltd | Rugeley | 2020 |
| Constellation Cruises (Holdings) Limited | Higher Poynton | 2017 |
| Constellation Cruises Limited | Higher Poynton | 2007 |
| Constellation Lighting Limited | Sheffield | 2004 |
| Constellation RFB Limited | London | 2023 |
| Constraction UK Ltd | London | 2019 |
| Construct Carpentry Limited | Wisbech | 2026 |
| Construct Glass Limited | Harlow | 2019 |
| Constructelec Ltd | Poulton-Le-Fylde | 2013 |
| Construction & Safety Signs Limited | Wadhurst | 1991 |
| Construction Agricultural ( Resprays ) Limited | Highbridge | 2023 |
| Construction Carpentry & Joinery Service Ltd | London | 2020 |
| Construction Composites Limited | Sittingbourne | 2005 |
| Construction Cutting Services Limited | Newcastle Upon Tyne | 1987 |
| Construction Fasteners Ireland Limited | Dungannon | 2006 |
| Construction Housing Limited | Shipley | 2012 |
| Construction Metal Forming Limited | Pontypool | 2005 |
| Construction Plant Repairs Limited | Magherafelt | 2014 |
| Construction Plant Services Limited | Cowbridge | 2007 |
| Construction Products Solutions International Ltd | Old Harlow | 2009 |
| Construction Profile Solutions Ltd | Bricket Wood | 2024 |
| Construction Robotics Limited | Oxted | 1992 |
| Construction Robotics Systems Ltd | Basildon | 2025 |
| Construction Safety Composites Ltd | Dunfermline | 2015 |
| Construction Specialties (U.K.) Limited | Aylesbury | 1975 |
| Construction Steelwork Ltd | Matlock | 2026 |
| Construction Tradesmen Limited | Okehampton | 2023 |
| CONSTRUCTION2DAY Ltd | Cardiff | 2019 |
| Constructioncrew Limited | Wigan | 2021 |
| Constructiv Clothing Limited | Newtown | 2010 |
| Constructive and Co Ltd | London | 2010 |
| Constructive Choice Ltd | Nottingham | 2016 |
| Constructive Image Limited | | 2004 |
| Constructive Media Limited | Usk | 2003 |
| Constructive Works Limited | Hitchin | 2020 |
| Constructs Carpentry Contractors Ltd | Bridgwater | 2026 |
| Construtech Steel & Joinery Ltd | Edinburgh | 2022 |
| Consul Plastic Ltd | London | 2024 |
| Consult Design Create Limited | Attleborough | 2008 |
| CONSULT4PROS Ltd | London | 2026 |
| CONSULT4TECH Ltd | Bedford | 2026 |
| Consultancy 26 Services Limited | Stockport | 2020 |
| Consultant Aero Services Ltd | Carrickfergus | 2019 |