| Cefas Technology Limited | Lowestoft | 2001 |
| Cefni Garage Ltd | Llangefni | 2015 |
| Ceftronics Limited | Birmingham | 2019 |
| CEG (Chesterfield) Ltd | Chesterfield | 2003 |
| CEG Packaging Limited | Liverpool | 2018 |
| Cega Access Ltd | Leeds | 2026 |
| Cegg Foods Ltd | Lechlade | 2025 |
| Cegin Earl / Earl's Kitchen CYF. | Cardiff | 2018 |
| Ceginau Lifestyle Kitchens Limited | Llanybydder | 2004 |
| Cegway Limited | Altrincham | 2003 |
| CEH Technologies Ltd | Salford | 2019 |
| Ceiba Floristry Company Ltd | Warrington | 2023 |
| Ceimig Limited | Dundee | 2004 |
| Ceintures Limited | Market Drayton | 1974 |
| CEL Critical Power UK Limited | Epsom | 2021 |
| CEL Sheet Metal Limited | Brighton | 2006 |
| Cel-Tec Metalworks Ltd | Greenlaw | 2024 |
| Celadon Pharma Hold Co Ltd | London | 2019 |
| Celadon Pharma Ltd | London | 2018 |
| Celadon Pharmaceuticals Limited | London | 2018 |
| Celadon Property Co Limited | London | 2019 |
| Celanese Production UK Limited | Derby | 2006 |
| Celatus Group Limited | Northwich | 2026 |
| Celbal Ltd | London | 2025 |
| Celcius Evans Ltd | Southampton | 2013 |
| Celcon Blocks Limited | Sevenoaks | 1984 |
| Celcon Limited | Sevenoaks | 1966 |
| Cele Couture Limited | Edinburgh | 2024 |
| Cele PAS Ltd | Croydon | 2022 |
| Celebglow Range Limited | London | 2016 |
| Celebration Drinks Limited | West Thurrock | 2010 |
| Celebration Holdings Limited | Staffordshire | 2003 |
| Celebration Lights Ltd | Hindhead | 2021 |
| Celebration Meal Limited | London | 2022 |
| Celebration Packaging Limited | Staffordshire | 1983 |
| Celebrity Chef Co Ltd. | London | 2021 |
| Celebrity Fragrance & Cosmetic Company Limited | London | 2000 |
| Celebrity Motion Furniture Limited | Sutton-In-Ashfield | 2000 |
| Celecs Ltd | Plymouth | 2025 |
| Celeritas Limited | Cambridge | 2018 |
| Celessence International Limited | Rochester | 2007 |
| Celest Elite UK Limited | Cambridge | 2025 |
| Celeste Craft Ltd | London | 2025 |
| Celeste Marine Services Limited | Torpoint | 2020 |
| Celestia Global Corporation Ltd | Cambridge | 2024 |
| Celestial Body Ltd | London | 2026 |
| Celestial Bows Ltd | High Peak | 2025 |
| Celestial Charms Limited | Coventry | 2025 |
| Celestial Creations Limited | Derbyshire | 2025 |
| Celestial Desire Jewellery Ltd | London | 2021 |
| Celestial Glow (Cornwall) Ltd | Romford | 2025 |
| Celestial Management Limited | Cardiff | 2012 |
| Celestial Symphony Ltd | Tintagel | 2017 |
| Celestial Windows and Conservatories Limited | Middlesbrough | 2010 |
| Celestialforge 3D Ltd | London | 2025 |
| Celestian Ltd | Birmingham | 2025 |
| Celestica Industries Limited | Stoke On Trent | 1987 |
| Celestium Nova Ltd | London | 2025 |
| Celetric Limited | Portsmouth | 2025 |
| Celex Oncology Innovations Limited | London | 2017 |
| Celfix Labels Limited | Hertfordshire | 2004 |
| Celgene UK Manufacturing (II) Limited | Birmingham | 2001 |
| Celgene UK Manufacturing Limited | Birmingham | 2004 |
| Celik Pipefitting Ltd | Gravesend | 2020 |
| Celina Rupp Jewellery Ltd | Holm | 2022 |
| Celix Pharma Ltd | London | 2020 |
| Cell City Ltd | London | 2018 |
| Cell Maintenance Services Ltd | Atherstone | 2023 |
| Cell Metric Limited | Sandy | 2005 |
| Cell Pack Solutions Limited | South Shields | 2001 |
| Cell Projects Limited | Maidstone | 2002 |
| Cell Safes Ltd | London | 2019 |
| Cell Security Limited | Derbyshire | 1988 |
| Cella Diuni Wines Ltd | Glasgow | 2024 |
| Cella Fine Violins Limited | Newark | 2022 |
| Cellar 8T Whisky Ltd | London | 2025 |
| Cellar Candles Ltd | London | 2026 |
| Cellar Dispense International Ltd | Shrewsbury | 2025 |
| Cellar Dispense Ltd | Glasgow | 2018 |
| Cellar Door Brewing Company Ltd | Bristol | 2021 |
| Cellar Gear Ltd | London | 2021 |
| Cellar Handling (UK) Ltd | Widnes | 1996 |
| Cellar Miser Limited | Crewe | 1999 |
| Cellarbar FM Limited | Belfast | 2015 |
| Cellareon Ltd | London | 2025 |
| Cellarmasters (U.K.) Limited | Mansfield | 1996 |
| Cellartech Solutions Ltd | Melton Mowbray | 2009 |
| Cellbeam Limited | Bury | 2003 |
| Cellbond Composites Limited | Huntingdon | 2026 |
| Cellcoat UK Ltd | Sheffield | 2020 |
| Cellcom Mobile Vehicle Solutions Limited | Halstead | 2015 |
| Cellcycle Limited | Manchester | 2020 |
| Cellerate Limited | Manchester | 2020 |
| Cellexus International Ltd | Dundee | 2017 |
| Cellfacts Analytics Ltd | Walsall | 2013 |
| Cellfix Limited | Folkestone | 2014 |
| Cellfluidx Ltd | Newcastle Upon Tyne | 2020 |
| Celli Group (UK) Limited | Thirsk | 1996 |
| Cellice Ltd | Ipswich | 2019 |
| Cellionix Ltd | Cambridge | 2025 |