| BJK Properties Limited | Real estate | 2022 |
| Blackraven Limited | Other services | 2000 |
| Blossom Tree Properties Limited | Real estate | 2015 |
| Bluebell House Freehold Company Limited | Households | 2021 |
| Bluebell House RTM Company Ltd | Households | 2017 |
| Bookends (Accounts) Limited | Professional & scientific | 2019 |
| Bosch Property Limited | Real estate | 2022 |
| Boscombe Capital Ltd | Financial services | 2017 |
| Bourne Cleaning Solutions Marlow Limited | Other services | 2017 |
| Bouve Limited | Information & communication | 2021 |
| Bracchium Ltd | Professional & scientific | 2001 |
| Brainwaves Systems U.K. Ltd | Wholesale & retail | 2008 |
| Brian D Shipley Ltd | Information & communication | 2012 |
| Bridge Peak Consulting Ltd | Administrative & support | 2025 |
| Brunel (Joinery & Construction) Limited | | 1984 |
| Brushford Developments Ltd | Construction | 2019 |
| Bryants Bottom Community Trust C.I.C. | Other services | 2011 |
| Brywood Studios Limited | Information & communication | 2015 |
| Bucks Property Recruitment Ltd | Administrative & support | 2023 |
| Bucks Property Services Ltd | Real estate | 2023 |
| Bull and Chisel Ltd | Construction | 2021 |
| Bunty & Norman Limited | Construction | 2022 |
| Burgo Fast Food Limited | Hospitality | 2021 |
| Burlington Bear Publishing Limited | Information & communication | 2010 |
| Busara Ltd | Administrative & support | 2026 |
| BV Associates Limited | Education | 2010 |
| BY Lola and Friends Ltd | Manufacturing | 2021 |
| Bytebox Technologies Limited | Information & communication | 2022 |
| Bzzd Energy Ltd | Hospitality | 2017 |
| C.E. Electronics Limited | Wholesale & retail | 1992 |
| Cabban & Co Ltd | Manufacturing | 2021 |
| Calcrest 2000 Limited | Information & communication | 1998 |
| Calcrest Property Investments Limited | Real estate | 2006 |
| Calumet Residents Limited | Households | 1985 |
| Carrol Trade Limited | Wholesale & retail | 2024 |
| CBA Strategies Limited | Professional & scientific | 2016 |
| Chackett Farming Limited | Agriculture & fishing | 2016 |
| Chequewrite (UK) Limited | Information & communication | 1997 |
| Cherrycroft Holmer Green Limited | Households | 1989 |
| Chesshomes Properties Ltd | Professional & scientific | 2020 |
| Chiltern Bifolds & Skylights Ltd | Construction | 2017 |
| Chiltern Bifolds Limited | Construction | 2023 |
| Chiltern Fine Foods Ltd | Wholesale & retail | 2023 |
| Chiltern Hill Properties LLP | | 2022 |
| Chiltern Ice Cream Company Limited | Manufacturing | 2015 |
| Chiltern Mushrooms Ltd | Agriculture & fishing | 2024 |
| Chiltern Payroll Ltd | Financial services | 2006 |
| Chiltern Ridges HS2 Action Group | Other services | 2011 |
| Chiltern Skin Clinic Limited | Health & social care | 2001 |
| Chiltern Taverns Limited | Hospitality | 2011 |
| Chiltern Vale Properties Ltd | Real estate | 2025 |
| Chiltern Wines Limited | Wholesale & retail | 2018 |
| Chilvers & Mccrea Limited | Health & social care | 2001 |
| Chris J Webb Limited | Construction | 2006 |
| Church Path Residents Association | Households | 2019 |
| CJS Furniture Consultant Ltd | Professional & scientific | 2010 |
| Claremont Court Management Company Limited | Real estate | 2008 |
| Clash Gour Developments Limited | Energy | 2025 |
| Clash Gour Wind Farm Limited | Energy | 2025 |
| Clawdd DU Ltd | Real estate | 2022 |
| Claytons Fencing Ltd | Construction | 2019 |
| Clocksmiths Ltd | Wholesale & retail | 2024 |
| Cloudcustom Ltd | Information & communication | 2015 |
| Cloudcustom Technologies Ltd | Information & communication | 2020 |
| CMA CGM Ltd | Transport & logistics | 2022 |
| Colin Bowden Limited | Construction | 2005 |
| Collins Universal Exports Limited | Professional & scientific | 2021 |
| Collins Wines Limited | Wholesale & retail | 1977 |
| Colston C (Gerrards Cross) Management Company Limited | Households | 2023 |
| Community Equipment Solutions Ltd | Professional & scientific | 2010 |
| Complete Book-Keeping Services Limited | Professional & scientific | 2001 |
| Coney Smallholding Ltd | Agriculture & fishing | 2026 |
| Considered Living Limited | Other services | 2015 |
| Construction Materials Limited | Wholesale & retail | 1992 |
| Cooper Studio Ltd | Arts & recreation | 2018 |
| Coopers Wharf Buckingham Management Limited | Households | 2006 |
| Copier & Technology Recycling Ltd | Wholesale & retail | 2010 |
| Coralvine Properties Limited | Real estate | 2023 |
| Cornerstone Finds Properties Ltd | Administrative & support | 2025 |
| Corwell (3) Management Limited | Households | 2009 |
| Cosmopay Holdings Limited | Wholesale & retail | 2015 |
| Cotswold Green Properties Ltd | Real estate | 2022 |
| Coulson Court Limited | Households | 1979 |
| Createpath Academy Ltd | Education | 2026 |
| Crecy Consultancy Ltd | Professional & scientific | 2017 |
| Crestwood Development Management Ltd | Construction | 2017 |
| Cromar Carpets Limited | Wholesale & retail | 2003 |
| Crowfly Enterprise Ltd | Transport & logistics | 2022 |
| Crowfly Express Ltd | Transport & logistics | 2025 |
| Crown Convenience Ltd | Wholesale & retail | 2022 |
| CSP Roofing Services Limited | Construction | 2025 |
| Culinary-Ventures Limited | Professional & scientific | 2026 |
| Cunningham Davis & Co. Limited | Professional & scientific | 1983 |
| Cutting Edge (Pitstone) LLP | | 2004 |
| DAM Safety Ltd | Extraterritorial | 2021 |
| DAN West Films Ltd | Information & communication | 2023 |
| Dark Chamber Media Limited | Administrative & support | 2021 |
| Dashing Pictures Ltd | Information & communication | 2024 |
| Databrix Ltd | Professional & scientific | 2024 |
| DC Kaye Solicitors Limited | Administrative & support | 2007 |