| Celebrity FM Ltd | Harrogate | 2015 |
| Celebrity Speakers International Limited | Fields | 1990 |
| Celestial Forge Trading Partners Ltd | Manchester | 2025 |
| Celestialcraze Events Ltd | Ipswich | 2026 |
| Celestialcraze Sports Ltd | London | 2025 |
| Celestion International Limited | Ipswich | 1946 |
| Celfab Limited | Nottingham | 2004 |
| Celfix Limited | Hertford | 2021 |
| Celia Matsanga Ltd | Royston | 2018 |
| Celia Urquhart Limited | Glasgow | 2006 |
| Celisk Limited | Glasgow | 2013 |
| Cell Infrastructure Limited | Great Yarmouth | 2020 |
| Cell Magic Limited | London | 2024 |
| Cell Medical Instruments Limited | Beckenham | 2017 |
| Cell Telecom Limited | Bracknell | 2000 |
| Cellantenna Limited | Chesham | 2004 |
| Cellar Choice Limited | Boundary Nr. Woodville | 1991 |
| Cellar Classics Limited | Chelmsford | 2014 |
| Cellar Group Limited | Hitchin | 2020 |
| Cellar Partners Ltd | Brighton | 2025 |
| Cellar Services (UK) Limited | Merthyr Tydfil | 2004 |
| Cellars International Limited | Scunthorpe | 1991 |
| Cellbond Limited | Huntingdon | 2001 |
| Cellmas Ltd | Hemel Hempstead | 2018 |
| Cello EOT Limited | Bishop Auckland | 2025 |
| Cellojen Laboratories Ltd | London | 2012 |
| Cellrex Ltd | London | 2026 |
| Cellsource Limited | Shrewsbury | 2024 |
| Cellular Laboratory Ltd. | London | 2017 |
| Cellular Radio Limited | Reading | 1982 |
| Celman Limited | London | 2012 |
| Celmar Ltd | Newark | 2019 |
| Celmat Limited | Torquay | 2013 |
| Celnic Holdings Limited | London | 2022 |
| Celnor Investments Limited | Manchester | 2023 |
| Celnor Nominee Limited | Manchester | 2025 |
| Celox Yachting Ltd | Bromley | 2021 |
| Celsia Systems Ltd | Buxton | 2004 |
| Celta Development Ltd | Egham | 2021 |
| Celtic Airs Limited | Craigavon | 2004 |
| Celtic Homes (Wales) Limited | Narberth | 2001 |
| Celtic Mining Operations Group Limited | Cardiff | 2007 |
| Celtic Tea Limited | London | 2012 |
| Celtic Ties Limited | Armagh | 2005 |
| Celtic Tyre Services (Bridgend) Limited | Winchester | 1963 |
| Celtic Tyre Services (Cardiff) Limited | Winchester | 1968 |
| Celtic Tyre Services (Holdings) Limited | Winchester | 1968 |
| Celtic Tyre Services (Maesteg) Limited | Winchester | 1972 |
| Celtridge Property Management Company Limited | South Norwood | 1990 |
| Celuform Building Products Limited | Solihull | 2007 |
| Celyn House Limited | Bristol | 2007 |
| CEM Properties Limited | Leeds | 2016 |
| Cemco 22 Limited | Bolton | 2012 |
| Cemco 23 Limited | Bolton | 2012 |
| Cemedge Limited | Harrogate | 2025 |
| Cemex Seament Limited | Coventry | 1986 |
| Cemhan Ltd | London | 2024 |
| Cemlime Limited | Glasgow | 2004 |
| Cemtec UK Ltd | Bury St. Edmunds | 2014 |
| Cender Ltd | Oldham | 2025 |
| Cenergy Investment Holding Co., Ltd. | London | 2015 |
| Cenex Limited | Loughborough | 2023 |
| Cengiz Consultancy Ltd | Twickenham | 2016 |
| Cengo Mango Ltd | London | 2026 |
| Ceni Antrim Company Limited | Belfast | 2016 |
| Cenix Ltd | London | 2024 |
| Cenos Industrial Manufacture Co., Limited | Stafford | 2013 |
| Cens Lighting Limited | London | 2017 |
| Censon Associates Limited | London | 2014 |
| Centaur Massage Therapy Limited | Tetbury | 2016 |
| Centech Limited | Melton Mowbray | 2006 |
| Centenary Works Management Company Limited | Rainham | 2010 |
| Center for Well-Being Ltd. | London | 2016 |
| Center Ltd | London | 2002 |
| Center of Academic Research & Studies (Ce.A.R.S) Limited | London | 2014 |
| Cento Limited | Loughborough | 2008 |
| Centorius (UK) Limited | Richmond | 2010 |
| Centra Corporation Ltd | Portsmouth | 2024 |
| Centra Design Limited | London | 2002 |
| Centra Foodmarkets Limited | Belfast | 1988 |
| Central & Regional Estates Limited | Maidstone | 2009 |
| Central Academy of Mind Body Medicine and Science Ltd. | London | 2009 |
| Central Access Limited | Normanton | 1998 |
| Central Agency Limited-(The) | Glasgow | 1896 |
| Central Aluminium Systems Ltd | West Bromwich | 2017 |
| Central and Urban Securities Limited | Cheltenham | 2005 |
| Central Asia UK Limited | | 2004 |
| Central Avenue Management Company Limited | Bangor | 2006 |
| Central Birmingham Cars Limited | London | 2008 |
| Central Business School Limited | Bedford | 2013 |
| Central CAB Company Limited | King'S Lynn | 2003 |
| Central CAB Hire Limited | South Croydon | 2014 |
| Central CNC Limited | Hagley | 2014 |
| Central Counties (Holdings) Limited | Mansfield | 2012 |
| Central Court (Salford) Limited | Manchester | 2005 |
| Central Diamond Drilling Services Limited | Bradwell, Braintree | 2012 |
| Central Directors Limited | Birmingham | 2000 |
| Central Double Glazing Repairs Ltd | Alloa | 2025 |
| Central European Commodity Trading Limited | Doncaster | 2012 |
| Central Fabrication Services Ltd | Grangemouth | 2022 |