| BCD Engineering (U.K.) Limited | Manufacturing | 2004 |
| BD Events Ltd | Arts & recreation | 2019 |
| Beauty by Hand Limited | Other services | 2018 |
| Beech Mount Consulting Limited | Professional & scientific | 2022 |
| Belsize Homes Limited | Construction | 2014 |
| BEN & BOO (Holdings) Limited | Financial services | 2022 |
| BEN & BOO Limited | Wholesale & retail | 2021 |
| Benchmark Oils Limited | Professional & scientific | 2001 |
| Benchmark Products Limited | Wholesale & retail | 2020 |
| Berkshire 74 Limited | Professional & scientific | 2025 |
| Bertie BS Home & Lifestyle Ltd | Wholesale & retail | 2022 |
| Bespoke Detailing Cotswolds Limited | Wholesale & retail | 2024 |
| Betterjustice Ltd | Professional & scientific | 2026 |
| Beyond France Limited | Wholesale & retail | 2003 |
| Beyond Haunted UK Ltd | Wholesale & retail | 2021 |
| Biddestone Stud Ltd | Agriculture & fishing | 2009 |
| Big Hippo Investments Ltd | Financial services | 2023 |
| Big Top Studios Ltd | Information & communication | 2023 |
| Bignar Constructions Limited | Construction | 2019 |
| Bingham Kindergarten Limited | Education | 2005 |
| Biorenu Ltd | Wholesale & retail | 2022 |
| Birkin Hewitt Associates Limited | Professional & scientific | 2010 |
| BIZ Start Figures Limited | Administrative & support | 2020 |
| Bloomfield Process Technology Limited | Professional & scientific | 2019 |
| Blue Arrow Advisory Limited | Professional & scientific | 2021 |
| Blue Goose Limited | Real estate | 2007 |
| Blytheco Limited | Professional & scientific | 2026 |
| Bobhills Limited | Real estate | 2025 |
| Bollard Proof Ltd | Transport & logistics | 2018 |
| Boswell Roofing Limited | Construction | 2015 |
| Boxa Ltd | Professional & scientific | 2022 |
| Boys' Toys Parties Limited | Wholesale & retail | 2016 |
| Braemore Homes Ltd | Construction | 2025 |
| Braemore Logistics Ltd | Transport & logistics | 2019 |
| Bramcote Holdings Ltd | Information & communication | 2019 |
| Brand New Way Limited | Professional & scientific | 2002 |
| Braydon Elite Ltd | Wholesale & retail | 2020 |
| Bristol Motor Worx Ltd | Wholesale & retail | 2025 |
| Bristol Trust Limited | Real estate | 1900 |
| Britannia Concrete Products Limited | Construction | 2014 |
| Bronwen Jeans Consulting Limited | Information & communication | 2026 |
| Brook Hall Farm Solar Limited | Energy | 2014 |
| Brooklyn Bespoke Glass Ltd | Construction | 2018 |
| Brooks Independent Funeral Directors Ltd | Other services | 2023 |
| Bsag Southwest Guttering Ltd | Construction | 2024 |
| Buco Limited | Information & communication | 2003 |
| Bullheart Ltd | Professional & scientific | 2024 |
| Burns Accountancy Limited | Professional & scientific | 2023 |
| Burton Hill Caravan and Camping Park Limited | Hospitality | 2012 |
| Buttercross Renovations Ltd | Construction | 2025 |
| Buzzard Education Limited | Information & communication | 2016 |
| C & J Electrical (Southwest) Ltd | Other services | 2006 |
| C & J Electrical (Southwest) Wholesale Ltd | Wholesale & retail | 2015 |
| C Hatherall Plumbing & Heating Limited | Construction | 2019 |
| C W Purton and Sons Ltd | Administrative & support | 2026 |
| C-Coach Ltd | Information & communication | 2020 |
| Caerbladon CIC | Wholesale & retail | 2022 |
| Cantham Investments Limited | Real estate | 1955 |
| CAPITAL27 Limited | Administrative & support | 2023 |
| Caravan Storage Wiltshire Ltd | Administrative & support | 2016 |
| Cary Carpentry and Building Ltd | Construction | 2025 |
| Castle Sundborn Limited | Financial services | 1964 |
| Cat & Mouse Theatre Ltd | Arts & recreation | 2020 |
| Catpowered Games Ltd | Information & communication | 2023 |
| CC & T Ltd | Information & communication | 2020 |
| Centaur Wellbeing Limited | Health & social care | 2015 |
| Centurion (Western) Limited | Construction | 1986 |
| CGP (Malmesbury) Limited | Construction | 2023 |
| Chaltom (UK) Consulting Limited | Information & communication | 2018 |
| Chancery Costings Limited | Professional & scientific | 2011 |
| CHANGE4PROFIT Limited | Information & communication | 2013 |
| Chapel ROW Property Limited | Real estate | 2004 |
| Charlton Hunter Limited | Other services | 2016 |
| Charlton Park Farms LLP | | 2026 |
| Charlton Park Stables Ltd | Agriculture & fishing | 2018 |
| Charlton Park Trustees 1 Limited | Other services | 2011 |
| Charlton Park Trustees 2 Limited | Other services | 2011 |
| Charlton Park Trustees 3 Limited | Other services | 2011 |
| Charlton Park Trustees 4 Limited | Other services | 2013 |
| Charlton PUB Ltd | Hospitality | 2026 |
| Chelworth Estates Management Limited | Real estate | 2014 |
| Chelworth Limited | Real estate | 2010 |
| Chelworth Water Company Limited | Water & waste | 2020 |
| Chipping Investments Limited | Real estate | 2013 |
| Chris James Property Investments Ltd | Real estate | 2018 |
| Chris Moore Consulting Limited | Professional & scientific | 2002 |
| Cirum Ltd | Professional & scientific | 2023 |
| Claske Ltd | Wholesale & retail | 2023 |
| Classic Windows and Conservatories Limited | Manufacturing | 1989 |
| Clementia Ltd | Wholesale & retail | 2021 |
| Cliff Olley Contractors Limited | Construction | 2002 |
| Clifford Design House Ltd | Professional & scientific | 2022 |
| CLUBS4KIDS Limited | Education | 2007 |
| CML Resources Limited | Administrative & support | 2019 |
| Cobblers BNB Limited | Real estate | 2026 |
| Cohab Ltd | Information & communication | 2026 |
| Cohere Charity | Health & social care | 2013 |
| Cole Close Management Company Limited | Households | 2015 |
| Commercial Management Support Limited | Professional & scientific | 2016 |
| Compass Graphic Design Limited | Wholesale & retail | 2008 |