| BTL Property Ltd | Real estate | 2017 |
| Bucksbakery Ltd | Hospitality | 2025 |
| Buddyluxxldn Ltd | Wholesale & retail | 2025 |
| Buffalo Greenwich Ltd | Hospitality | 2026 |
| Build & Heat Solutions Ltd | Construction | 2013 |
| Build Bright Ltd | Construction | 2018 |
| Build-O-Rama Ltd | Construction | 2011 |
| Building & Handyman Service 24/7 Limited | Construction | 2018 |
| Building Construction Management Ltd | Other services | 2015 |
| Building Digital Limited | Professional & scientific | 2026 |
| Buildonce Ltd | Construction | 2025 |
| Bulgaro Installations (London) Ltd | Construction | 2023 |
| Bulgaro Interiors (London) Ltd | Manufacturing | 2023 |
| Bulgaro Limited | Manufacturing | 2010 |
| Bulgaro London Limited | Wholesale & retail | 2018 |
| Bundle Packs Ltd | Wholesale & retail | 2021 |
| Bunker Burger Food Ltd | Hospitality | 2026 |
| Bunker Burger Ltd | Hospitality | 2025 |
| Burning Girl Productions Limited | Information & communication | 2014 |
| Bursted Wood Primary School | Education | 2013 |
| Bury Hill Consulting Limited | Professional & scientific | 2018 |
| Business Motoring Media Limited | Information & communication | 2025 |
| Business Sales Development Solutions Ltd | Professional & scientific | 2023 |
| Business Talks and Workshops Ltd | Professional & scientific | 2015 |
| Bustina Delicatessen Ltd | Wholesale & retail | 2024 |
| Bustina Investiment Ltd | Real estate | 2021 |
| Bustina Ltd | Hospitality | 2018 |
| Butler Developments Ltd | Construction | 2018 |
| Buzard Ltd | Construction | 2017 |
| Byrcon Limited | Construction | 2017 |
| Byrsum Recruitment Limited | Administrative & support | 2023 |
| C & D Restoration Limited | Administrative & support | 2005 |
| C & G Professional Ltd | Health & social care | 2012 |
| C Sanders Ltd | Wholesale & retail | 2021 |
| C&C Edition Limited | Construction | 2020 |
| C&G Exclusive Limited | Wholesale & retail | 2014 |
| C&M Drywall Limited | Construction | 2023 |
| C&S Controls Limited | Manufacturing | 2009 |
| C. Playford Electrical Services Limited | Construction | 2014 |
| CA Froggatt Ltd | Wholesale & retail | 2024 |
| CAD Property Ltd | Real estate | 2018 |
| CADTEC3D Ltd | Professional & scientific | 2013 |
| Caethem Design Limited | Real estate | 2015 |
| Caethem Investments Ltd | Real estate | 1974 |
| Caffé Faro Ltd | Hospitality | 2025 |
| Cain Associates LLP | | 2011 |
| Cain Utilities Ltd | Construction | 2023 |
| Cajeos Limited | Health & social care | 2024 |
| Calibre Property Developments Limited | Construction | 2005 |
| Cambridge Shipping Containers Global Ltd | Administrative & support | 2025 |
| Cameo Property Group Ltd | Real estate | 2025 |
| Camilybert Properties Ltd | Real estate | 2024 |
| Canberra Technology Limited | Information & communication | 2026 |
| Canopy's Prodigal Limited | Wholesale & retail | 2014 |
| CAP Renovations Ltd | Real estate | 2021 |
| Capable Movers Limited | Transport & logistics | 2015 |
| Capital Asset Services Ltd | Construction | 2024 |
| Capital Contract Services Limited | Construction | 2003 |
| Capital Technologies Limited | Information & communication | 2019 |
| Capital Trade Services Ltd | Transport & logistics | 2023 |
| Capitaljjr Ltd | Real estate | 2025 |
| Capoeira First Step Ltd | Education | 2025 |
| Care Bar Consultancy Ltd | Professional & scientific | 2024 |
| Care Essence Support Ltd | Administrative & support | 2014 |
| Care Gentle Ltd | Health & social care | 2020 |
| Care Housing Group CIC | Hospitality | 2022 |
| Carey's Garden Secrets Limited | Other services | 2015 |
| Carpanini's Carpentry Ltd | Extraterritorial | 2023 |
| Carpe Diem (UK) Limited | Wholesale & retail | 2013 |
| Cartiq Crafts Ltd | Wholesale & retail | 2025 |
| Casalogic Limited | Information & communication | 2013 |
| Casey George Barnehurst Limited | Other services | 2026 |
| Casey George Hair Limited | Other services | 2024 |
| Cc&Ma Limited | Wholesale & retail | 2017 |
| CCR Group Limited | Administrative & support | 2025 |
| CCR Recruiting Limited | Administrative & support | 2018 |
| CCR Recruitment Services Ltd | Administrative & support | 2020 |
| CCS Shopfitters Limited | Professional & scientific | 2006 |
| CDH Insulations Limited | Construction | 2012 |
| Cedar Forwarding Services Limited | Transport & logistics | 1982 |
| Cedar IT Services Ltd | Information & communication | 2024 |
| Cedar Services Ltd | Administrative & support | 2024 |
| Celcore Ltd | Information & communication | 2018 |
| Central Accounting Services (Kent) Ltd | Professional & scientific | 2022 |
| CHA and Grain Ltd | Wholesale & retail | 2025 |
| Chadwell Heath "a" Management Limited | Households | 1984 |
| Chameleon Collaborative CIC | Education | 2023 |
| Chameleon Homes Limited | Real estate | 2019 |
| Champion Real Estate and Management Ltd | Real estate | 2022 |
| Champion Retail Ltd | Wholesale & retail | 2017 |
| Chan Chan Fang Limited | Hospitality | 2018 |
| Chancellors LEA Brewer LLP | | 2009 |
| Chandler Construction Ltd | Construction | 2025 |
| Chapman Flex Limited | Transport & logistics | 2018 |
| Chapman Mechanical Limited | Construction | 2020 |
| Chappers Limited | Administrative & support | 2013 |
| Charizze Ophthalmology Limited | Health & social care | 2026 |
| Chartax Accountancy Ltd | Professional & scientific | 2013 |
| Chase Lakes Limited | Agriculture & fishing | 2020 |
| Chatgp Limited | Health & social care | 2025 |