| BCS International Limited | Professional & scientific | 2003 |
| BDE Consulting Ltd | Professional & scientific | 2019 |
| BE Precision Fit Limited | Arts & recreation | 2016 |
| Beaufort Polo Club Limited | Arts & recreation | 2017 |
| Beauty LAB by Amber Ltd | Other services | 2023 |
| Becky's Bespoke Breaks Ltd | Hospitality | 2023 |
| Bedtime and Beyond Ltd | Professional & scientific | 2025 |
| Belgrave Dental Limited | Health & social care | 2024 |
| Bell Design Consultants Limited | Administrative & support | 2009 |
| Bellmanor Limited | Households | 1999 |
| Berkeley Trailers and Horseboxes Limited | Wholesale & retail | 2025 |
| Bernard Atkins Limited | Professional & scientific | 2002 |
| Berzeli Ltd | Hospitality | 2010 |
| Beverston Press Ltd | Information & communication | 2009 |
| Bewell Therapy Limited | Health & social care | 2015 |
| BGM Automotive Ltd | Wholesale & retail | 2018 |
| Bibury Court Limited | Hospitality | 2007 |
| Big Blue Films Limited | Information & communication | 2020 |
| Big Pictures Location Services Ltd | Administrative & support | 2023 |
| Binkytech Limited | Professional & scientific | 2014 |
| Birr Renewable Ltd | Construction | 2023 |
| Bishops Mead Limited | Households | 2002 |
| BJF Solutions Ltd | Construction | 2024 |
| Blackbird Interiors Ltd | Construction | 2012 |
| Blackwall Reach Trust | Other services | 2019 |
| Blanik Limited | Other services | 2022 |
| Blue Haus Ltd | Real estate | 2018 |
| Blue Security Products Limited | Professional & scientific | 2008 |
| Bluebird Collective Limited | Information & communication | 2025 |
| BMS Consult Ltd | Professional & scientific | 2024 |
| BNT Brickwork Limited | Construction | 2026 |
| Boots and Cats Ltd | Professional & scientific | 2015 |
| Boxwood Close Limited | Extraterritorial | 1984 |
| Breviter Ltd | Hospitality | 2010 |
| Broadbeam Limited | Information & communication | 2013 |
| Broadbean Digital Ltd | Extraterritorial | 2012 |
| Broomhall Projects Limited | Professional & scientific | 2003 |
| Brushdale Consulting Limited | Professional & scientific | 2010 |
| Brushneen & Co Ltd | Construction | 2024 |
| BT Indirect Limited | Information & communication | 2008 |
| Buckies Bakes Ltd | Manufacturing | 2021 |
| Burcher Investments Limited | Real estate | 2014 |
| Burton Dury & Co Limited | Real estate | 2014 |
| Business Services 38 Limited | Professional & scientific | 2010 |
| Bybrook Physiotherapy Limited | Other services | 2017 |
| C & J Cohoon Limited | Real estate | 2025 |
| C Goff & Sons Haulage & Contracting Ltd | Transport & logistics | 2025 |
| C S Building Services Ltd | Construction | 2005 |
| C U Partnership Ltd | Real estate | 2012 |
| C&R SH Lettings Ltd | Real estate | 2026 |
| C.S.D. Construction International Ltd | Construction | 2020 |
| Callovian Gundogs Ltd | Arts & recreation | 2026 |
| Cams Engineering Ltd | Administrative & support | 2010 |
| Canopy Insight Limited | Professional & scientific | 2013 |
| Captain's House Holiday Lets Limited | Hospitality | 2021 |
| Caroline Ingraham Limited | Education | 2004 |
| Carter Funeral Directors Ltd | Other services | 2025 |
| Cascade Risk Management Ltd | Wholesale & retail | 2024 |
| Cascadoo Consultancy Limited | Professional & scientific | 2016 |
| Caswell Estates Limited | Administrative & support | 2004 |
| Causer Holbrook Ventures Limited | Real estate | 2024 |
| CB Autos UK Ltd | Wholesale & retail | 2007 |
| Cb&M Management Limited | Arts & recreation | 2022 |
| CDB Building Services Limited | Construction | 2006 |
| Centaur Massage Therapy Limited | Extraterritorial | 2016 |
| CG Plastering & Damp Proofing Ltd | Construction | 2019 |
| Chalcombe Limited | Professional & scientific | 2018 |
| Chalmers Gems Limited | Wholesale & retail | 2020 |
| Charis Insights Ltd | Professional & scientific | 2020 |
| Charlie Hamilton James Photography Limited | Professional & scientific | 2021 |
| Cherry Comms Ltd | Professional & scientific | 2022 |
| Chester Consultancy Limited | Wholesale & retail | 2022 |
| Chester House Tetbury Management Limited | Households | 1991 |
| Chilli Kitchens Ltd | Administrative & support | 2010 |
| CHJ Developments Limited | Extraterritorial | 2010 |
| Choice Fire & Security Solutions EOT Trustee Limited | Administrative & support | 2024 |
| Church Street Barbers Limited | Other services | 2017 |
| Chutebridge Ltd | Real estate | 2024 |
| City of Bath Hockey Club Limited | Arts & recreation | 2014 |
| Civil Aviation Global Ltd | Professional & scientific | 2015 |
| Clarart Ltd | Construction | 2016 |
| Classic Baskets Limited | Wholesale & retail | 2006 |
| Clearly Driven Consulting Ltd | Professional & scientific | 2026 |
| Cloudsparcels Ltd | Transport & logistics | 2025 |
| CMC Accountancy Services Limited | Professional & scientific | 2017 |
| Cockley Estates Limited | Real estate | 2003 |
| Cocoon & Family Ltd | Other services | 2010 |
| Cocoon Care Ltd | Health & social care | 2023 |
| Coinstone Limited | Professional & scientific | 1984 |
| Colethrop Properties Limited | Real estate | 2015 |
| Collapse Limited | Wholesale & retail | 2026 |
| Colne Renewables Limited | Construction | 2023 |
| Commercial Clearances (South West) Limited | Administrative & support | 2025 |
| Committed Companions Ltd | Transport & logistics | 2025 |
| Commune Invest Limited | Information & communication | 2018 |
| Community Action Treks Limited | Arts & recreation | 2002 |
| Community Housing London Limited | Real estate | 2010 |
| Compass Boiler Services Limited | Administrative & support | 2010 |
| Compass Drive Property Investments Limited | Real estate | 2023 |
| Compass Technology Services (2011) Limited | Information & communication | 2011 |