| Burghley Consulting Limited | Professional & scientific | 2019 |
| Burrows House Ltd | Construction | 2025 |
| Burtons Mill Management Company Limited | Households | 1994 |
| Bury Farm Close Residents Limited | Households | 1996 |
| Bury Farm Equestrian Club Ltd | Arts & recreation | 2011 |
| Busford Aviation Limited | Professional & scientific | 2019 |
| Business Efficiency Services Limited | Professional & scientific | 2017 |
| Butler and Boon Ltd | Real estate | 2024 |
| Butlers Electrical Limited | Construction | 2023 |
| Butterflyer Limited | Hospitality | 2019 |
| Buy OR Barter Limited | Wholesale & retail | 2023 |
| Buzz Cinema CIC | Information & communication | 2024 |
| Buzz Moto Limited | Wholesale & retail | 2026 |
| Buzzard Blinds & Awnings Limited | Wholesale & retail | 2000 |
| Buzzard Equipment Services Limited | Wholesale & retail | 2022 |
| Buzzard Leighton Ltd | Hospitality | 2024 |
| Buzzard Reptile & Aquatics Limited | Wholesale & retail | 2017 |
| Buzzard Take Away Ltd | Hospitality | 2024 |
| Buzzard Tandoori Ltd | Hospitality | 2023 |
| Buzzcleans Ltd | Administrative & support | 2026 |
| Buzzer Buses (Dial a Ride) Ltd | Transport & logistics | 2005 |
| Buzzrail Cafe Ltd | Hospitality | 2017 |
| Buzzy BEE Tyres Ltd | Wholesale & retail | 2015 |
| BVB Motors Limited | Administrative & support | 2026 |
| BVH Properties Limited | Real estate | 2007 |
| BW 1855 Wine Consultancy Limited | Professional & scientific | 2025 |
| BW Foods Limited | Wholesale & retail | 1998 |
| BW Supplies Limited | Real estate | 2015 |
| BWF Temporary Works Design Limited | Construction | 2019 |
| BY Twelve Ltd | Information & communication | 2025 |
| Byroc Ltd | Wholesale & retail | 2014 |
| C & C Properties (Yorkshire) Limited | Real estate | 2021 |
| C and S Equipment Limited | Manufacturing | 1993 |
| C J'S Plumbing Services Ltd | Construction | 2017 |
| C N West Properties Limited | Real estate | 2021 |
| C R Management Solutions Limited | Construction | 2008 |
| C&C Analysts Ltd | Professional & scientific | 2021 |
| C&J Future Stars Academy CIC | Education | 2025 |
| C&M Management Ltd | Real estate | 2026 |
| C&R Prime Properties Ltd | Real estate | 2026 |
| C-Tec Limited | Manufacturing | 1996 |
| C-Trak Limited | Manufacturing | 1981 |
| C.A. Bond and Sons Ltd | Construction | 2025 |
| C.P. Metalwork Solutions Limited | Manufacturing | 2012 |
| C2 Technology Solutions UK Ltd | Information & communication | 2025 |
| Cable Court Management Limited | Real estate | 1999 |
| Cachet Cleaning & Environmental Services Limited | Other services | 2014 |
| CAD Technology Limited | Administrative & support | 2014 |
| Cadencehrservices Limited | Professional & scientific | 2025 |
| Cades Properties Newco Limited | Professional & scientific | 2020 |
| Cainhoe Wood Driving Range Limited | Arts & recreation | 2020 |
| Calcia Trading UK Ltd | Construction | 2021 |
| Calex Electronics EOT Limited | Financial services | 2025 |
| Calex Electronics Limited | Manufacturing | 1999 |
| Caliendos Ltd | Manufacturing | 2018 |
| Calmbeach Ltd | Information & communication | 2025 |
| Calvert Studios (UK) Limited | Professional & scientific | 1994 |
| Calvert Studios UK & Spain Limited | Financial services | 1976 |
| CAM Air Management Limited | Professional & scientific | 1989 |
| Camberton Mardle Ltd | Real estate | 2024 |
| Cambria Design Ltd | Information & communication | 2024 |
| Camlowe Limited | Construction | 2019 |
| Campbell Wharf Management Company Limited | Real estate | 2018 |
| Canal Mews Management Company (Linslade) Limited | Households | 2016 |
| Canal ST Coffee (Leighton Buzzard) Limited | Hospitality | 2022 |
| Cancroft Limited | Administrative & support | 2017 |
| Candentis Financial Services Ltd | Professional & scientific | 2009 |
| Cape Tours Limited | Administrative & support | 2000 |
| Capital Rail Limited | Administrative & support | 2013 |
| Capricorn Management Ltd | Professional & scientific | 2008 |
| Capsol Limited | Information & communication | 2020 |
| Car Sector Ltd | Wholesale & retail | 2024 |
| Car Tech Services Ltd | Wholesale & retail | 2020 |
| Caradog Cyber Ltd | Information & communication | 2022 |
| Carbon Cycle Solutions Ltd | Other services | 2020 |
| Carbon Equation Limited | Professional & scientific | 2025 |
| Carburetter Exchange LB Limited | Wholesale & retail | 2026 |
| Cardinal Audio Ltd | Information & communication | 2021 |
| Cardinal Economics Ltd | Professional & scientific | 2024 |
| Cardmastersunite Limited | Wholesale & retail | 2024 |
| CARE4U2DAY Limited | Health & social care | 2012 |
| Career Smart Consulting Ltd | Administrative & support | 2019 |
| Carewell Solutions Ltd | Health & social care | 2024 |
| Cargotek Express Ltd | Wholesale & retail | 2018 |
| Cargowise Logistics Limited | Transport & logistics | 2025 |
| Carlton Foods Limited | Wholesale & retail | 1995 |
| Carmody Creative Limited | Information & communication | 2025 |
| Carpets and Flooring by John Wright Ltd | Construction | 2020 |
| Carrington House Ltd | Health & social care | 2009 |
| Carter Aerials Limited | Information & communication | 2014 |
| Carterstone Investments Limited | Real estate | 2021 |
| Carver Trading Limited | Information & communication | 2010 |
| Casazeal Ltd | Real estate | 2021 |
| Casclamp Attachments Limited | Administrative & support | 2018 |
| Cascode Ltd | Manufacturing | 2021 |
| Case Superstore Ltd | Wholesale & retail | 2015 |
| Cassie White Equine Services Ltd | Agriculture & fishing | 2026 |
| Cassio Metro Management Company Limited | Households | 2003 |
| Castel-Branco Architecture Limited | Administrative & support | 2021 |
| Castle Gate (Bedford) Ltd | Households | 2025 |