| Branded Merchandise (UK) Limited | Wholesale & retail | 2003 |
| Brar Property Partners Ltd | Real estate | 2018 |
| Brett & Bazely Ltd | Real estate | 2025 |
| Bright Smile Hygiene Ltd | Health & social care | 2015 |
| Brilliant Home Improvements Limited | Construction | 2011 |
| Brinphar Limited | Health & social care | 2012 |
| Britannia Property Investments Ltd | Real estate | 2016 |
| Britannia Quality Ltd | Administrative & support | 2018 |
| Brockley Combe Residents Association Limited | Households | 1967 |
| Broken Gate Ltd | Real estate | 2024 |
| Brooke Vincent Ltd | Professional & scientific | 2006 |
| Brookleaf Limited | Information & communication | 2016 |
| Broomfield A&N Properties Limited | Real estate | 2021 |
| Broomfield Coffee Company Ltd | Wholesale & retail | 2018 |
| BT Properties London Ltd | Real estate | 2024 |
| Bubblepop Productions Limited | Arts & recreation | 2011 |
| Bubblersproductions Ltd | Hospitality | 2009 |
| Buck's Electrical and Data Services Ltd | Construction | 2013 |
| Buckley Savers Limited | Wholesale & retail | 2023 |
| Building&Property Maintenance Ltd | Households | 2025 |
| Buildright Services Ltd | Construction | 2025 |
| C & E Assets Ltd | Real estate | 2025 |
| C J Groundworks Solutions Ltd | Construction | 2022 |
| C&P CAN FIX IT Ltd | Construction | 2022 |
| C&S Consultants (Southern) Limited | Professional & scientific | 2009 |
| C.K.E Carpentry Limited | Construction | 2008 |
| C.P. Data to Insight Limited | Professional & scientific | 2022 |
| Cafe DE Vida Ltd | Wholesale & retail | 2020 |
| CAG Consulting Ltd | Information & communication | 2017 |
| CAG Properties Ltd | Real estate | 2018 |
| Callisia Limited | Energy | 1965 |
| Camilla Close Residents Association Limited | Households | 1984 |
| Canash Properties Limited | Real estate | 2025 |
| Capital Property Group Limited | Real estate | 2017 |
| Capital Service Solutions Limited | Administrative & support | 2021 |
| Care Flight Limited | Administrative & support | 2015 |
| Cargo Training Limited | Transport & logistics | 2023 |
| Carl Mitchell Motorsport Limited | Arts & recreation | 2024 |
| Carnatica LLP | | 2008 |
| Carrera Investments Limited | Real estate | 2024 |
| Cartherapy Limited | Wholesale & retail | 2019 |
| Castle Maintenance Limited | Construction | 2000 |
| Castles Constructions Limited | Construction | 2024 |
| Caterpillars Pre-School Walton Limited | Education | 2015 |
| Caterply Limited | Construction | 2015 |
| CD Proquire Services Ltd | Real estate | 2024 |
| CEC Travel Services Ltd | Transport & logistics | 2023 |
| Cedar Myrtle Limited | Financial services | 2015 |
| Cedar Place (Sunbury) Management Company Limited | Households | 2009 |
| Cedarcourtrentals Limited | Real estate | 2024 |
| Celebrus Technologies PLC | Information & communication | 1985 |
| Centreview Properties Ltd | Real estate | 2022 |
| Cgcg (UK) Ltd. | Real estate | 1995 |
| CH Ashford Limited | Professional & scientific | 1996 |
| Chahil's Properties Ltd | Real estate | 2025 |
| Chariot Express Transport Limited | Transport & logistics | 2005 |
| Charles Distro Group Ltd | Wholesale & retail | 2025 |
| Checkpoint GG Limited | Information & communication | 2018 |
| Cheltonian Park (Esher) Management Limited | Households | 2006 |
| Chertsey Brewery Ltd | Hospitality | 2026 |
| Chessholme Court Management Company Limited | Households | 1986 |
| Chilobs Limited | Health & social care | 2010 |
| Chinos Limited | Real estate | 2010 |
| Chinwick Ltd | Real estate | 2024 |
| Chris & Mateo Transport Ltd | Transport & logistics | 2013 |
| Church Square Nursery Limited | Education | 2026 |
| Churchill HUI EOT Limited | Administrative & support | 2023 |
| Churchill HUI Group Limited | Professional & scientific | 2016 |
| Churchill HUI International Limited | Professional & scientific | 1999 |
| Churchill HUI Limited | Professional & scientific | 2011 |
| Cineco Ltd | Construction | 2008 |
| Civitas Healthcare Ltd | Health & social care | 2021 |
| Clarke CKD Limited | Education | 2023 |
| Classic Cleaning Bucks Limited | Administrative & support | 2024 |
| Classy Cleaners Ltd | Administrative & support | 2023 |
| Cleaninga Ltd | Transport & logistics | 2017 |
| Cleanok Ltd | Administrative & support | 2024 |
| CLH Consulting Ltd | Administrative & support | 2011 |
| Climate Control Engineering Limited | Manufacturing | 2016 |
| Clinpact Ltd | Professional & scientific | 2024 |
| Clofloor Limited | Wholesale & retail | 2015 |
| Cloudnativeplus Ltd | Information & communication | 2025 |
| Co Pro Ltd | Administrative & support | 2019 |
| Coastal Getaways Ltd | Real estate | 2022 |
| Coeus Designer Ltd | Wholesale & retail | 2024 |
| Cold Forged Gear Ltd | Wholesale & retail | 2025 |
| Colorworks Decorating Services Limited | Construction | 2003 |
| Common Sense Privacy Limited | Professional & scientific | 2000 |
| Comms Assist Ltd | Information & communication | 2017 |
| Complex Network Solutions Ltd | Information & communication | 2010 |
| Computerised and Digital Security Systems Limited | Administrative & support | 1989 |
| Connetra Ltd | Administrative & support | 2025 |
| Construction Consultancy Group Ltd | Construction | 2026 |
| Consulting Direct West London Limited | Professional & scientific | 2023 |
| Cooper & Whyte Ltd | Real estate | 2023 |
| Corbicula Limited | Professional & scientific | 2016 |
| Corcoran Plumbing Ltd | Construction | 2025 |
| Corporate Brand Consulting Ltd | Professional & scientific | 2021 |
| Costas Holdings Limited | Financial services | 2024 |
| Cosykey Properties Ltd | Real estate | 2026 |