| Bourton Holdings Ltd | Professional & scientific | 2026 |
| Box Catering 86 Ltd | Hospitality | 2024 |
| Box Hill Motors Limited | Wholesale & retail | 2002 |
| Box House (Services) Ltd | Real estate | 1982 |
| Box Upholstery Ltd | Manufacturing | 2017 |
| Boxcut Pictures Ltd | Information & communication | 2013 |
| BP Consultancy Ltd | Health & social care | 2016 |
| Bracon ASH Solar Limited | Energy | 2016 |
| Bradford on Avon Golf Course Limited | Extraterritorial | 1986 |
| Brandanswers Ltd | Information & communication | 2026 |
| Brandiie Limited | Information & communication | 2020 |
| Brett Salako Photography Ltd | Professional & scientific | 2022 |
| Brooks Smith Gallery Ltd | Arts & recreation | 2010 |
| Brunel Crescent Services Ltd | Administrative & support | 2012 |
| Brunel Park Estates Limited | Hospitality | 2017 |
| Brunswick Hotel Group Limited | Hospitality | 2016 |
| Brushworks Studios Limited | Real estate | 2025 |
| Btusa Ltd | Wholesale & retail | 2024 |
| Buffalo House Ltd | Arts & recreation | 2018 |
| Bunting Training Limited | Education | 2021 |
| Burj at Harp and Crown Restaurants Ltd | Hospitality | 2025 |
| Busty Kelp Limited | Information & communication | 2006 |
| BVB 86 Ltd | Construction | 2018 |
| BY Maria Ltd | Administrative & support | 2015 |
| Bybrook View Management Company Limited | Administrative & support | 2015 |
| Byerley Stud (Courtlands) Limited | Agriculture & fishing | 2020 |
| C B&P (Holdings) Ltd | Construction | 2019 |
| C IS for Cat Limited | Professional & scientific | 2006 |
| C P Property Developments Limited | Construction | 2007 |
| C&G Collections Holdings Limited | Financial services | 2022 |
| C&G Collections Ltd | Water & waste | 2018 |
| Cabbyswiltshire Ltd | Transport & logistics | 2021 |
| Calon Wealth Management Ltd | Professional & scientific | 2023 |
| Cancer Centre London LLP | | 2010 |
| Cannett Farms LLP | | 2018 |
| Cantantes Solares Ltd | Arts & recreation | 2025 |
| Cantonese & Szechuan Cuisine Ltd | Hospitality | 2022 |
| Carefreecredit Ltd | Financial services | 2013 |
| Caroline Phillips Management Ltd | Arts & recreation | 2023 |
| Catalyst Financial Consulting LLP | | 2022 |
| Cavity Trays (Management) Limited | Professional & scientific | 1993 |
| Cavity Trays Limited, | Manufacturing | 1963 |
| Celtic Management Ltd | Households | 2026 |
| Cert Brands Ltd | Wholesale & retail | 2008 |
| Chadwick Materials Handling Limited | Manufacturing | 1998 |
| Charlotte Fenn Ltd | Professional & scientific | 2022 |
| Chatham Park Estate Management Company Limited(The) | Households | 1977 |
| Cherry Orchard House Management Company Limited | Households | 2019 |
| Chesterton Practice Ltd | Health & social care | 2024 |
| Chimera Arts Ltd | Arts & recreation | 1993 |
| Chippenham Conservatories & Windows Limited | Financial services | 2015 |
| Chippenham Gymnastics Limited | Arts & recreation | 2014 |
| Chippenham Moonraker Gymnastics C.I.C. | Arts & recreation | 2012 |
| Chippenham, Corsham and Box Primary Care Network (PCN) Ltd | Health & social care | 2021 |
| Chuckaboos Limited | Administrative & support | 2016 |
| Church Farm Commercial Ltd | Real estate | 2018 |
| Cinwood Holdings (2020) Ltd | Financial services | 2020 |
| Cinwood Limited | Construction | 1980 |
| Cjmarsh Ltd | Health & social care | 2012 |
| Clancy Optical Limited | Professional & scientific | 2024 |
| Classic Sports Car Club Limited | Arts & recreation | 2003 |
| Clear Stretch Ltd | Administrative & support | 2019 |
| Clear Vision Accountancy Limited | Professional & scientific | 2003 |
| Clear Vision Holdings Limited | Financial services | 2019 |
| Clear Word Consulting Ltd | Information & communication | 2022 |
| Clearbridge Capital Limited | Other services | 2025 |
| Cleveland Court(Bath)Limited | Households | 1965 |
| Clifford Holdco Limited | Real estate | 1987 |
| Clifford Parentco Limited | Real estate | 2014 |
| CLOUD4AUTOMATION Ltd | Information & communication | 2018 |
| CMS Alliance Ltd | Financial services | 2018 |
| CMS Architects Ltd | Professional & scientific | 1994 |
| CMS Construction Consultants Ltd | Construction | 2007 |
| CMS Interiors Ltd | Professional & scientific | 2019 |
| CMS Landscape Architects Ltd | Professional & scientific | 2019 |
| CMS Project Managers and Surveyors Ltd | Professional & scientific | 2013 |
| Coed Celyn Associates Ltd | Professional & scientific | 2018 |
| COG Bikes Limited | Professional & scientific | 2024 |
| Cohesys Limited | Information & communication | 2025 |
| Cold Climate Expeditions Limited | Arts & recreation | 1995 |
| Commercial and Contract LLP | | 2020 |
| Complete Estate Agents Ltd | Real estate | 2016 |
| Composite Data Solutions Ltd | Information & communication | 2002 |
| Confluence Talent Limited | Professional & scientific | 2022 |
| Conservatories and Windows Ltd | Construction | 2011 |
| Consort Events Limited | Administrative & support | 2014 |
| Coppershell Lettings Limited | Real estate | 2025 |
| Coppins Management Corsham Limited | Households | 2018 |
| Copybravo Ltd | Professional & scientific | 2024 |
| Coralberry Limited | Wholesale & retail | 2003 |
| Corinthian Stone (Bath) Limited | Construction | 2023 |
| Corsham Area Development Trust Community Interest Company | Arts & recreation | 2006 |
| Corsham Aviation Services Limited | Professional & scientific | 2024 |
| Corsham Building Plastics (Holdings) Limited | Construction | 2015 |
| Corsham Dental Ceramics Limited | Health & social care | 2009 |
| Corsham Grill Ltd | Hospitality | 2025 |
| Corsham Gymnastics Academy Limited | Arts & recreation | 2020 |
| Corsham Hardware Ltd | Wholesale & retail | 2016 |
| Corsham Institute Limited | Education | 2013 |
| Corsham Patios & Fencing Limited | Administrative & support | 2013 |