| Buyond Hub Ltd | Wholesale & retail | 2025 |
| BVJ Properties Ltd. | Real estate | 2018 |
| Bwcs Contract Ltd | Professional & scientific | 2013 |
| Byron Glass Company Limited | Construction | 1990 |
| Bywater Restaurants Limited | Hospitality | 2018 |
| C & D Rentals Limited | Extraterritorial | 2015 |
| C & DC Solutions Limited | Other services | 2022 |
| C & L Janitorial Limited | Wholesale & retail | 2005 |
| C & S Property Enterprise Limited | Real estate | 2022 |
| C Bodyworks Limited | Wholesale & retail | 2024 |
| C J Joinery Services Ltd | Construction | 2023 |
| C J Owen Limited | Information & communication | 2016 |
| C Kelly Brickwork Specialists Limited | Construction | 2008 |
| C L C Building Services (Midlands) Limited | Construction | 2018 |
| C N K Solutions Limited | Financial services | 2003 |
| C Stocks Hospitality Ltd | Hospitality | 2025 |
| C Talmadge Consultancy Ltd | Professional & scientific | 2014 |
| C WE R Here Trainning Academy Ltd | Education | 2023 |
| C Williams Electrical Services Limited | Construction | 2021 |
| C&C Fashion Ltd | Wholesale & retail | 2024 |
| C&Cp Ltd | Manufacturing | 2015 |
| C&J Refined Floors LLP | | 2025 |
| C. Chiverton Roofing Ltd | Construction | 2025 |
| C. Handley Ltd | Manufacturing | 2005 |
| C. Holmes Holdings Limited | Wholesale & retail | 2025 |
| C. Silver Builders (South East) Ltd | Construction | 2023 |
| C.A.K Waste Ltd | Water & waste | 2024 |
| C.M.S. Recovery Limited | Wholesale & retail | 2013 |
| CA Asset Holding Co Ltd | Real estate | 2026 |
| CAB Spedition Ltd | Transport & logistics | 2022 |
| Cable and Copper Recycling Limited | Wholesale & retail | 2022 |
| Cache Network Solutions Ltd | Information & communication | 2023 |
| CAE Cycling Limited | Wholesale & retail | 2023 |
| CAE Group Holdings Ltd | Financial services | 2025 |
| CAE Online Academy Ltd | Education | 2025 |
| Caffe Cravings Limited | Hospitality | 2025 |
| Café DE Nissè Ltd | Hospitality | 2025 |
| Calagran Four Paws Hotel Limited | Other services | 2013 |
| Caligran Holdings Limited | Financial services | 2021 |
| Calmstar Property Ltd | Real estate | 2025 |
| Calpearc Ltd | Hospitality | 2021 |
| Calvary Chapel Mansfield Limited | Other services | 2003 |
| Calypso Crew Removals Ltd | Transport & logistics | 2025 |
| Camberley Green Limited | Real estate | 2023 |
| Cambria Installations Ltd | Construction | 2016 |
| Cambridge Advisory Forum Ltd | Professional & scientific | 2018 |
| Cambridge Surveying Services Limited | Construction | 2015 |
| Camelia Transport Ltd | Transport & logistics | 2019 |
| Camerons (Management) Limited | Households | 2001 |
| Campions Ladies Limited | Other services | 2021 |
| Cams Customs Limited | Wholesale & retail | 2021 |
| Camu Camu Ltd | Wholesale & retail | 2019 |
| CAN YOU Dance? Limited | Administrative & support | 2013 |
| Candor Developments (UK) Limited | Construction | 2016 |
| Canect European Technologies Ltd | Manufacturing | 2014 |
| Canimotion Ltd | Professional & scientific | 2024 |
| Cannon Venture Finance Holdings Limited | Financial services | 2017 |
| Cannon Venture Finance Limited | Financial services | 1999 |
| Cannonkitchenuk Ltd | Hospitality | 2024 |
| Cantar Cars Ltd | Wholesale & retail | 2025 |
| Capello by Kieren Limited | Wholesale & retail | 2025 |
| Capital Cleaning Company Limited | Administrative & support | 2024 |
| Capital Construction (G.B.) Limited | Construction | 1994 |
| Car and Leisure Limited | Arts & recreation | 2005 |
| Caraways Property Ltd | Administrative & support | 2023 |
| Carbonfront Limited | Manufacturing | 2010 |
| Careergift Limited | Extraterritorial | 1998 |
| Carfish Ltd | Wholesale & retail | 2020 |
| Cargom Limited | Transport & logistics | 2026 |
| Carl Smith Drylining Limited | Construction | 2016 |
| Carl Wright Ltd | Financial services | 2020 |
| Carlisle Construction Materials Limited | Wholesale & retail | 1978 |
| Carlisle Lease Holdings Ltd | Real estate | 2023 |
| Carlo's Wines Limited | Wholesale & retail | 2015 |
| Carlotta Group Ltd | Wholesale & retail | 2022 |
| Carlton UK Holdings Ltd | Professional & scientific | 2014 |
| Carlton UK Properties Ltd | Households | 2016 |
| Carpatin Limited | Construction | 2025 |
| Cars Covers Limited | Wholesale & retail | 2011 |
| Cars Ready to Go Ltd | Wholesale & retail | 2025 |
| Cartedge Limited | Wholesale & retail | 2025 |
| Carter James Investment Property Limited | Administrative & support | 2024 |
| Carter Lane Day Nursery Limited | Education | 2004 |
| Carter Oriental Limited | Hospitality | 2026 |
| Cartwright Consultancy Limited | Information & communication | 2018 |
| Casa Limpia Cleaning Services Ltd | Administrative & support | 2025 |
| Casa UNO Ltd | Real estate | 2026 |
| Cascade Carpets Limited | Wholesale & retail | 2003 |
| Case Construction and Plant Services Ltd | Construction | 2014 |
| Casemaster Technology Limited | Administrative & support | 2011 |
| CASH4CLOTHES Ltd | Wholesale & retail | 2019 |
| Cashinclothes Recycling Ltd | Wholesale & retail | 2012 |
| Castle Control Solutions Ltd | Construction | 2012 |
| Castle DIY Ltd | Wholesale & retail | 2018 |
| Castle Tower Construction Ltd | Wholesale & retail | 2016 |
| Castledine Court Management Company Limited | Households | 2005 |
| Castlegate 263 Limited | Manufacturing | 2003 |
| Castlewood Loft Ladders Limited | Construction | 2022 |
| Catalin Auto Repair Limited | Manufacturing | 2023 |
| Catchbest Limited | Wholesale & retail | 1991 |