| Bling IT on Limited | Wholesale & retail | 2010 |
| Block Titan Capital Ltd | Real estate | 2024 |
| Blue Card Limited | Real estate | 2026 |
| Blue Lagoon Centres Ltd | Health & social care | 2017 |
| Blue Sky Bright Solutions Limited | Professional & scientific | 2007 |
| BMG Clubs Limited | Hospitality | 2026 |
| Bmntz Ltd | Administrative & support | 2025 |
| BN Developments & Property Maintenance Ltd | Real estate | 2025 |
| BN20 Properties Ltd | Real estate | 2020 |
| Body Plus Dynamics Limited | Extraterritorial | 1999 |
| Body Scanning Ltd | Administrative & support | 2016 |
| Bolsover Court Residents Association Limited | Households | 1978 |
| BON Vita Style Ltd | Arts & recreation | 2012 |
| Bond Rees Holdings Ltd | Financial services | 2025 |
| Bond Rees Investments Ltd | Construction | 2026 |
| Bookroom Art Press Limited | Wholesale & retail | 2010 |
| Bourne Beautiful Ltd | Other services | 2024 |
| Bourne Building Solutions Ltd | Construction | 2019 |
| Bourne Energy Ltd | Construction | 2022 |
| Bourne Holdings Group Ltd | Financial services | 2025 |
| Bowden's Books Limited | Professional & scientific | 2012 |
| BPH90INVEST Limited | Financial services | 2025 |
| Bramley Park Camping Ltd | Hospitality | 2022 |
| Brand Consortia Ltd | Administrative & support | 2010 |
| Branddorr Limited | Manufacturing | 2024 |
| Breeden Holdings Limited | Arts & recreation | 2020 |
| Bricklehurst Manor School Limited | Education | 2001 |
| Brighton Ltd | Extraterritorial | 2021 |
| Brigstock Properties Limited | Real estate | 1960 |
| Britannia Food Ingredients Ltd | Manufacturing | 2025 |
| Britannia Superfine Ingredients Ltd | Manufacturing | 2025 |
| Bromsgrove Boaters Limited | Arts & recreation | 2016 |
| Brook 360 Ltd | Professional & scientific | 2025 |
| Brookfield Court Management Company (Bexhill) Limited | Households | 1978 |
| Brown & Blue Circles Ltd | Information & communication | 2025 |
| Brown Eagle Limited | Administrative & support | 2010 |
| Browns Construction Contractors Ltd | Construction | 2018 |
| Browns Properties South East Ltd | Real estate | 2020 |
| Bruzell & Co LLP | | 2008 |
| Buer Ltd | Other services | 2024 |
| Bull's Head Camping Ltd | Hospitality | 2023 |
| Burger N Spirit Ltd | Hospitality | 2023 |
| Button Media Ltd | Information & communication | 2013 |
| Buzz Bexhill Limited | Other services | 2008 |
| Buzz Electronics Limited | Manufacturing | 2010 |
| BW Energy Ltd | Construction | 2025 |
| Byzz Plus Limited | Information & communication | 2020 |
| C & G Commercial Holdings Ltd | Financial services | 2022 |
| C & W SE Ltd | Construction | 2023 |
| C and G Commercial Services Limited | Construction | 1996 |
| C B Winter & Sons Limited | Administrative & support | 2002 |
| C Brown Electrical Services Ltd | Construction | 2023 |
| C&A Injection Moulding Ltd | Manufacturing | 2013 |
| C&H Electrical Services Ltd | Manufacturing | 2021 |
| C&L Property Management Ltd | Real estate | 2025 |
| C.H. Ellis Limited | Agriculture & fishing | 1962 |
| Caburn Ltd | Arts & recreation | 2020 |
| Caddywhompus Television Limited | Administrative & support | 2009 |
| Cadence CC Ltd | Arts & recreation | 2020 |
| Cadren Software Ltd | Information & communication | 2019 |
| Calibre Marketing Limited | Professional & scientific | 2002 |
| Calltrix Ltd. | Information & communication | 2005 |
| Callum Elliott Consulting Limited | Professional & scientific | 2024 |
| Calm Swirl Consultancy Ltd | Information & communication | 2022 |
| Camel's EYE Limited | Information & communication | 2025 |
| Candescence Engineering Limited | Professional & scientific | 2012 |
| Caparoglu Ltd | Real estate | 2026 |
| Cardamom Films Ltd | Information & communication | 2021 |
| Carilex Medical Limited | Administrative & support | 2016 |
| Carneys Auto Locksmiths Ltd | Wholesale & retail | 2026 |
| Carrolls Ltd | Wholesale & retail | 2000 |
| Carruthers & Luck Estate Agents Ltd | Real estate | 2014 |
| Carter Nealgrove Catering Ltd | Hospitality | 2026 |
| Castlereagh Services Limited | Professional & scientific | 2017 |
| Cat Vision Ltd | Wholesale & retail | 2013 |
| Catharsis Publishing Limited | Extraterritorial | 2011 |
| Ceridwen Limited | Information & communication | 2012 |
| Cetor Limited | Real estate | 1994 |
| Chachi Limited | Wholesale & retail | 2021 |
| Chaffin Construction Ltd | Construction | 2020 |
| Chalk Hill Studios Ltd | Manufacturing | 2020 |
| Chalk Path Ltd | Administrative & support | 2025 |
| Chandlers Building Supplies Holdings Limited | Wholesale & retail | 2008 |
| Chandlers Building Supplies Limited | Wholesale & retail | 1993 |
| Chandlers Roofing Supplies (Coventry) LLP | | 2010 |
| Chandlers Roofing Supplies (Halesowen) Limited | Wholesale & retail | 2010 |
| Chandlers Roofing Supplies (North London) Limited | Wholesale & retail | 2013 |
| Chandlers Roofing Supplies Limited | Wholesale & retail | 2010 |
| Chandlers Topco Limited | Wholesale & retail | 2019 |
| Changenius Consulting Limited | Professional & scientific | 2016 |
| Chapman & Basc Partners Ltd | Administrative & support | 2025 |
| Chapmans Properties Ltd | Real estate | 2024 |
| Chargeforwards Limited | Information & communication | 2024 |
| Charityworks | Administrative & support | 2010 |
| Charles Eaton Language School Ltd | Education | 2024 |
| Chart One Automotive Ltd | Administrative & support | 2012 |
| Charval Construction Limited | Construction | 1998 |
| Chatfields Jewellers Limited | Wholesale & retail | 2013 |
| Chatham Court Residents Company Limited | Extraterritorial | 2004 |
| Chatham Green Limited | Real estate | 2010 |