| Bumblelos Limited | Real estate | 2015 |
| Bump Leeds Ltd | Wholesale & retail | 2021 |
| BUN Distribution Limited | Wholesale & retail | 2021 |
| Burbank Construction Limited | Construction | 2013 |
| Burford Corner Management Company Limited | Households | 1987 |
| Burgess Insurance Services Limited | Financial services | 2004 |
| Burgover Limited | Hospitality | 2024 |
| Burkie Ltd | Wholesale & retail | 2024 |
| Burlington Holdings Limited | Health & social care | 2006 |
| Burton and Smith Investments Ltd | Real estate | 2020 |
| Bury Road Associates Limited | Professional & scientific | 2017 |
| BUS and Coach Management Solutions Limited | Extraterritorial | 2016 |
| Business Accountancy Solutions Limited | Professional & scientific | 2010 |
| Business Centric IT Ltd | Information & communication | 2012 |
| Business Succession Planning Limited | Professional & scientific | 2006 |
| Buxton Street Property Limited | Real estate | 2017 |
| Bvmh Groundworks Ltd | Construction | 2019 |
| Bvmh Holdings Ltd | Real estate | 2026 |
| Bwblin Ltd | Manufacturing | 2024 |
| BWH Solutions Ltd | Professional & scientific | 2018 |
| BY Holdings Horsham Ltd | Hospitality | 2025 |
| Byjove Media Limited | Extraterritorial | 2016 |
| Bylett Bricklayers Limited | Construction | 2008 |
| BZ Tecnico Limited | Manufacturing | 2025 |
| C & C 790 Limited | Construction | 2011 |
| C & C Car Sales Limited | Wholesale & retail | 2010 |
| C & C Moulds Limited | Water & waste | 1994 |
| C & L Catering Sussex Ltd | Hospitality | 2022 |
| C and L Computers Limited | Wholesale & retail | 2015 |
| C K Construction (West Sussex) Ltd | Construction | 2026 |
| C N Shannon Limited | Health & social care | 2011 |
| C P Decorating Limited | Administrative & support | 2010 |
| C R Chapman Building Services Ltd | Construction | 2017 |
| C-Raw Studios Limited | Information & communication | 2021 |
| C.& M.Fire Alarms Limited | Construction | 1971 |
| C.J. Jackson & Sons Limited | Agriculture & fishing | 1971 |
| C.P.Backhurst & Co.Limited | Administrative & support | 1956 |
| C.S.S. Systems Ltd | Construction | 2000 |
| Cacti Films Limited | Information & communication | 2000 |
| Cadence Standard Ltd | Information & communication | 2026 |
| Cadenza Italy Limited | Wholesale & retail | 2015 |
| Cador Limited | Wholesale & retail | 2014 |
| Caelum Aviation Ltd | Transport & logistics | 2026 |
| Cafe DU Van Catering Limited | Hospitality | 2014 |
| Caid Consulting Limited | Information & communication | 2014 |
| Cailie Dimmock Ltd | Arts & recreation | 2022 |
| Cairnrent Limited | Hospitality | 1989 |
| Caissa Accountancy Limited | Professional & scientific | 2004 |
| Calcrest Ltd | Administrative & support | 2019 |
| Caledonian Airways Ltd | Transport & logistics | 2025 |
| Calero Services Ltd | Professional & scientific | 2016 |
| Cali Property Limited | Real estate | 2021 |
| Calibre D2D Ltd | Transport & logistics | 2022 |
| Callington Gray Limited | Administrative & support | 2019 |
| Calm Homes Ltd | Real estate | 2025 |
| CAM Media Limited | Information & communication | 2022 |
| Cambian Advanced Engineering Limited | Extraterritorial | 2000 |
| Cambian Engineering Solutions Limited | Extraterritorial | 2004 |
| Cambria Close Management Limited | Real estate | 2007 |
| Camelia Botnar Limited | Manufacturing | 1982 |
| Camelia Botnar Nominees Limited | Financial services | 2017 |
| Camomile Lawn Limited | Other services | 2020 |
| Campbell Ventures Limited | Administrative & support | 2011 |
| Campsey Interiors Ltd | Construction | 2021 |
| Cancun Sun Ltd | Other services | 2024 |
| Candid LIM LLP | | 2017 |
| Candle With Care Ltd | Wholesale & retail | 2025 |
| Canine Superfoods Ltd | Manufacturing | 2024 |
| Canopy Sales & Marketing Consultants Ltd | Professional & scientific | 2015 |
| CAP Auto Imports Ltd | Wholesale & retail | 2024 |
| Capable Minds Mathematics Ltd | Education | 2024 |
| Capel Tree Surgeons Limited | Agriculture & fishing | 2016 |
| Capelhurst Limited | Construction | 2020 |
| Capella Consultancy Limited | Financial services | 2016 |
| Capewell & Capewell Building & Plumbing Services Ltd | Construction | 2007 |
| Capital MEP Ltd | Professional & scientific | 2024 |
| Capstreet Ltd | Wholesale & retail | 2012 |
| Capturemine Limited | Information & communication | 2009 |
| Car & Driving Limited | Information & communication | 2014 |
| Car Loft Limited | Extraterritorial | 2022 |
| Caragon Holdings Limited | Financial services | 2016 |
| Cardboard Cuts Ltd | Information & communication | 2019 |
| Cardinal Support Services Ltd | Administrative & support | 2024 |
| Careconnx Ltd | Health & social care | 2025 |
| Careermakers Team Ltd | Administrative & support | 2026 |
| Carerex Careuk Ltd | Administrative & support | 2016 |
| Carfax Developments Ltd | Real estate | 2001 |
| Cargo Associates Limited | Financial services | 2009 |
| Caring Culture LLP | | 2020 |
| Caring Hands-Horsham LLP | | 2025 |
| Carl Adair Ltd | Professional & scientific | 2026 |
| Carlestone Ltd | Wholesale & retail | 2025 |
| Carleton Change & Transformation Ltd | Professional & scientific | 2019 |
| Carlisle Contracting Ltd | Wholesale & retail | 2015 |
| Carluca Ltd | Administrative & support | 2015 |
| Carma Cars Ltd | Wholesale & retail | 2025 |
| Carmichael Building Design Ltd | Professional & scientific | 2013 |
| Carolina Skies Consultancy Ltd | Professional & scientific | 2016 |
| Caroline Banks & Associates Limited | Financial services | 1994 |
| Caroline Liddon Associates Ltd | Administrative & support | 2023 |