| BS & B LLP | | 2011 |
| BT Associates Limited | Administrative & support | 2006 |
| Btrobinsons Ltd | Real estate | 2025 |
| Bttw Limited | Other services | 2021 |
| Buckley Property Development Group Ltd | Real estate | 2025 |
| Buckley Roofing and Building Limited | Construction | 2019 |
| Buglow Electrical Contractors Limited | Construction | 2008 |
| Buildspect Limited | Construction | 2020 |
| Bullion House Group Ltd | Professional & scientific | 2016 |
| Burkes CAD Services Limited | Information & communication | 2010 |
| Bushis Construction Limited | Construction | 2016 |
| Business Broker Services Limited | Professional & scientific | 2022 |
| Business Consult and SEE Limited | Professional & scientific | 2017 |
| Butler Cctv Ltd | Administrative & support | 2020 |
| BW Van Centre Limited | Wholesale & retail | 2024 |
| BY Bradley Kirkham Ltd | Wholesale & retail | 2023 |
| BY Chelmer (Holdings) Limited | Professional & scientific | 2005 |
| BY Chelmer PLC | Professional & scientific | 2005 |
| BY NOM Limited | Professional & scientific | 2005 |
| Bycentral Holdings Limited | Professional & scientific | 2003 |
| Bycentral Limited | Other services | 2003 |
| BYK Investments NO.1 Limited | Financial services | 2013 |
| BYK Investments NO.2 Limited | Financial services | 2013 |
| BYK Investments NO.3 Limited | Financial services | 2013 |
| Bynorth (Holdings) Limited | Professional & scientific | 2007 |
| Bynorth Limited | Construction | 2007 |
| Bytels Limited | Wholesale & retail | 2017 |
| Bywest (Holdings) Limited | Professional & scientific | 2000 |
| Bywest Limited | Other services | 2000 |
| C & G Land Estates Limited | Real estate | 2019 |
| C K H Consultancy Limited | Administrative & support | 2011 |
| C&C Property Enterprises Limited | Real estate | 2020 |
| C&T Investments Limited | Real estate | 2020 |
| C. Anderson Solutions Limited | Construction | 2014 |
| C2 Partnerships Ltd | Administrative & support | 2022 |
| Caled Properties Limited | Real estate | 2020 |
| Callaghan Brickwork Limited | Construction | 2012 |
| Callaghan Groundwork and Civil Engineering Ltd | Construction | 2026 |
| Calligraphics Limited | Professional & scientific | 2016 |
| Canelo Lifestyle Limited | Wholesale & retail | 2024 |
| Canelo Properties Limited | Real estate | 2022 |
| Canema RTM Company Ltd | Households | 2016 |
| Cannons Security Limited | Administrative & support | 2008 |
| Cannons UK Group Limited | Construction | 2026 |
| Canwill Technology Ltd | Information & communication | 2010 |
| Capital Hospitals (Holdings) Ltd. | Administrative & support | 2005 |
| Capital Hospitals (Issuer) PLC | Financial services | 2005 |
| Capital Hospitals Ltd. | Administrative & support | 2005 |
| Capjoy Limited | Real estate | 2025 |
| Capsec Ltd | Construction | 2017 |
| Cardonwood Limited | Construction | 2000 |
| Care Craft Buildings Ltd | Construction | 2025 |
| Care Gateway Limited | Transport & logistics | 2022 |
| Carlton Family Investments Limited | Real estate | 2010 |
| Carrick Group Limited | Administrative & support | 2011 |
| Carrick Landscapes Limited | Professional & scientific | 2024 |
| Carville Construction Limited | Construction | 2012 |
| Casa Travella Limited | Real estate | 2002 |
| Castleview Enterprises Limited | Wholesale & retail | 1998 |
| Cdlg Building & Decorating Services Limited | Construction | 2003 |
| Cedarcroft Building Services Ltd | Real estate | 2020 |
| Cengizler Ltd | Hospitality | 2025 |
| Central Nottinghamshire Hospitals (Holdings) Limited | Financial services | 2005 |
| Central Nottinghamshire Hospitals PLC | Health & social care | 2005 |
| Centrepoint Technologies Limited | Administrative & support | 2001 |
| Centum Realty Ltd | Hospitality | 2019 |
| Cephos Electronic Circuits Limited | Manufacturing | 1980 |
| Cephos Relays Limited | Manufacturing | 2024 |
| Certs Assured Technology Limited | Manufacturing | 2015 |
| CF Mechanical Ltd | Energy | 2023 |
| CGT Enterprises Limited | Professional & scientific | 2024 |
| Chad Walters (UK) Ltd | Transport & logistics | 2013 |
| Chaks Property Investments Ltd | Real estate | 2021 |
| Chamberlain Childcare Limited | Health & social care | 2014 |
| Champion Estates Limited | Wholesale & retail | 2022 |
| Champion Gaming Limited | Administrative & support | 2023 |
| Champion Hotels Limited | Real estate | 2007 |
| Channeled Flow Limited | Construction | 2008 |
| Chantry Gardens Freehold Management Company Limited | Households | 2017 |
| Chapman Paint FX Limited | Construction | 2019 |
| Chaptre Finance PLC | Financial services | 2015 |
| Chaptre Greenco Limited | Financial services | 2017 |
| Chaptre Holdings Limited | Financial services | 2015 |
| Chaptre Investments Limited | Financial services | 2015 |
| Charles' Homes Limited | Real estate | 2020 |
| Charlie Coffey Design Ltd | Professional & scientific | 2019 |
| Charlotte Fitzgerald Consulting Ltd | Professional & scientific | 2012 |
| Charlotte Fitzpatrick Limited | Information & communication | 2009 |
| CHARLTON38 Ltd | Other services | 2024 |
| Charter Services Janitorial Limited | Administrative & support | 2008 |
| Chats in the Community CIC | Education | 2021 |
| Chef Zone Chefs Limited | Administrative & support | 2021 |
| Chelsfield Motor Works Limited | Wholesale & retail | 2004 |
| Cherry Bomb Beauty Ltd | Other services | 2022 |
| Chertsey Services Ltd. | Real estate | 2020 |
| Chesterton Electrical Contractors Limited | Construction | 2011 |
| Chloswift Ltd | Information & communication | 2023 |
| Chocolates From Heaven Limited | Manufacturing | 2007 |
| Choice Africa Limited | Wholesale & retail | 2015 |
| Chopras Pharmacy Limited | Wholesale & retail | 2009 |