| Black Stone Publishers Ltd | Information & communication | 2026 |
| Blue Beluga Limited | Professional & scientific | 2016 |
| Bordeaux Investment Wines Limited | Wholesale & retail | 2013 |
| BPG Global Services Limited | Administrative & support | 2024 |
| Branch Care Services Ltd. | Health & social care | 2018 |
| Branch Court Limited | Health & social care | 2012 |
| Brand Brokers UK Limited | Real estate | 2018 |
| Brand Support Services UK Limited | Real estate | 2018 |
| Breathe Architecture & Build Ltd | Professional & scientific | 2019 |
| Bridge the GAP Management Limited | Arts & recreation | 2023 |
| Broadcrest Limited | Professional & scientific | 2012 |
| Brom Catering Ltd | Hospitality | 2018 |
| Brompton Finance Limited | Financial services | 2016 |
| Brompton Financial Limited | Professional & scientific | 2016 |
| Browsio CIC | Professional & scientific | 2022 |
| Broxash Financial Limited | Professional & scientific | 2026 |
| Bryant's Waste Management Ltd | Water & waste | 2020 |
| BSW Property Services Ltd | Construction | 2025 |
| Bugden Properties Ltd | Real estate | 2017 |
| Builders for Quality Ltd | Construction | 2024 |
| Building Energy Consulting Ltd | Professional & scientific | 2007 |
| BUS Hire Group Ltd | Wholesale & retail | 2025 |
| Business Partnership Group UK Limited | Administrative & support | 2018 |
| BVH Ifold Limited | Real estate | 2019 |
| Caffe Tropea Holdings Limited | Hospitality | 2022 |
| Caffe Tropea Limited | Wholesale & retail | 2019 |
| Caffe' Z'Ani Ltd | Wholesale & retail | 2014 |
| CALCUL8 Solutions Ltd | Professional & scientific | 2019 |
| Canini Technologies Ltd | Information & communication | 2009 |
| Capital Construct Ltd | Construction | 2018 |
| Capital KOI Ltd | Wholesale & retail | 2026 |
| Car Shar Limited | Wholesale & retail | 2025 |
| Carbon Cycle Limited | Professional & scientific | 2009 |
| Carey Care Limited | Financial services | 2022 |
| Carey Care Services Ltd | Professional & scientific | 2019 |
| Carford Developments Limited | Real estate | 2013 |
| Carnoustie Advisory and Sports Limited | Professional & scientific | 2023 |
| Carpe Diem Events and Entertainment Ltd | Hospitality | 2022 |
| Catara Health Ltd | Health & social care | 2018 |
| Cater 2 YOU Ltd | Wholesale & retail | 2014 |
| Catrisk Projects Ltd | Professional & scientific | 2015 |
| Cedrus Investments Limited | Financial services | 2016 |
| Cemp Recruitment Ltd | Administrative & support | 2021 |
| Central London Mortgages Ltd | Financial services | 2014 |
| Century Estates Limited | Real estate | 2005 |
| Ceris UK Limited | Information & communication | 2017 |
| CFG Associates Limited | Information & communication | 2022 |
| CGI Catering Limited | Hospitality | 2017 |
| Chapman Estate Management Limited | Real estate | 2011 |
| Charlene M&H Homes Ltd | Real estate | 2024 |
| Charlene Sustainable HR Solutions Limited | Professional & scientific | 2024 |
| Charles Jane Property Limited | Real estate | 2021 |
| Chiltern BUS Company Limited | Transport & logistics | 2014 |
| Chislehurst Gate Management Limited | Households | 2002 |
| Chrysalis Capital Advisors Limited | Professional & scientific | 2024 |
| Churchview Close Apartments Limited | Real estate | 2017 |
| Cintillate Ltd. | Health & social care | 2018 |
| Cirrim Limited | Professional & scientific | 2012 |
| CJS Ccjs Ltd | Other services | 2025 |
| Cleaner for YOU Surrey Ltd | Households | 2020 |
| Cleaner Than Ever Norbury Ltd | Administrative & support | 2022 |
| Cleankill (Environmental Services) Limited | Administrative & support | 1995 |
| Clicks Media Limited | Real estate | 2014 |
| Coats & Doodles Limited | Wholesale & retail | 2024 |
| Code Compass Ltd | Administrative & support | 2024 |
| Colman Coaching Limited | Arts & recreation | 2023 |
| Columbus Resources Limited | Professional & scientific | 2007 |
| Common Tongue Limited | Real estate | 2010 |
| Communication Key Ltd | Health & social care | 2015 |
| Community Crisis Care Limited | Health & social care | 2018 |
| Community Living Kenbury House Ltd. | Health & social care | 2017 |
| Community Living Knight's House Ltd | Health & social care | 2021 |
| Community Living Lansdowne Ltd | Health & social care | 2026 |
| Community Living Ltd | Health & social care | 2019 |
| Community Living NW Ltd | Health & social care | 2022 |
| Community Living SE London Ltd | Health & social care | 2026 |
| Community Living South East Ltd | Health & social care | 2022 |
| Community Living Trinity Ltd | Health & social care | 2026 |
| Conbuild Limited | Construction | 2025 |
| Connect+Create Limited | Professional & scientific | 2025 |
| Contract Air Services Limited | Construction | 2021 |
| Converge Consultive Ltd | Information & communication | 2023 |
| Coombe Avenue (Sevenoaks) Company Limited | Households | 1994 |
| CPZ Refurbishment Ltd | Construction | 2021 |
| Crafty Wholesale Limited | Wholesale & retail | 2020 |
| Cream Engineering Services Ltd | Professional & scientific | 2021 |
| Creative Development Consulting Ltd | Professional & scientific | 2023 |
| Crellin Actuarial Services Limited | Financial services | 2020 |
| Crescent Moon Homes Limited | Real estate | 2022 |
| Crestor Properties & Investments Limited | Real estate | 2010 |
| Croftwood House Management Limited | Households | 2023 |
| Croydon Infinity Construction Ltd | Construction | 2026 |
| Crystals Elite Ltd | Education | 2022 |
| CTW Enterprises Limited | Professional & scientific | 2014 |
| Cubes OUT Ltd | Information & communication | 2021 |
| Cyberloggie Consulting Ltd | Information & communication | 2026 |
| Dajude Limited | Wholesale & retail | 2021 |
| DAK16 Ltd | Professional & scientific | 2016 |
| Dalmore Consulting Limited | Information & communication | 2009 |
| DAN Does Health Ltd | Professional & scientific | 2025 |