| Byron Consultants Limited | Professional & scientific | 2012 |
| Byron MAY Holdings Limited | Financial services | 2021 |
| Byte Cognetics Ltd | Information & communication | 2022 |
| Byte Solutions Ltd | Information & communication | 2024 |
| BZ General Construction Ltd | Construction | 2023 |
| BZ Recovery Ltd | Wholesale & retail | 2025 |
| Bzsultan Ltd | Information & communication | 2022 |
| C & C Autotech Mobile Limited | Manufacturing | 2024 |
| C & C Concerns Ltd | Health & social care | 2016 |
| C & C Printers Limited | Manufacturing | 2002 |
| C & E Styles Ltd | Wholesale & retail | 2025 |
| C & M Burgess Limited | Administrative & support | 2017 |
| C & M Gardener Builders Ltd | Construction | 2014 |
| C D 4 U Limited | Health & social care | 2014 |
| C E Noel Limited | Financial services | 2025 |
| C E Z Properties Limited | Real estate | 2017 |
| C Ferguson Limited | Health & social care | 2019 |
| C Fisher & Sons Limited | Agriculture & fishing | 2025 |
| C J Fegan Ltd | Construction | 2014 |
| C J Grants Limited | Construction | 2015 |
| C Jackson & Sons Bedford Limited | Construction | 2005 |
| C L Apartments Limited | Real estate | 2023 |
| C M Engineering and Constructions Ltd | Construction | 2023 |
| C P Cleaning Services Limited | Administrative & support | 2005 |
| C P Investment Management Ltd | Real estate | 2019 |
| C R Plumbing & Drainage Ltd | Construction | 2018 |
| C S Editing Limited | Information & communication | 2012 |
| C&A Tanning Ltd | Other services | 2021 |
| C&C Oakspec Ltd | Manufacturing | 2018 |
| C&C Stewartby Limited | Construction | 2025 |
| C&D Sports Management Ltd | Education | 2020 |
| C&I Consulting Limited | Administrative & support | 2023 |
| C&J Holmes Ltd | Real estate | 2023 |
| C&J Maintenance Limited | Real estate | 2019 |
| C&J Property Limited | Real estate | 2017 |
| C&J Sparkle Cleaners Limited | Administrative & support | 2023 |
| C&Jh Properties Ltd | Real estate | 2025 |
| C&P Trans Logistics Ltd | Transport & logistics | 2020 |
| C&R Land Ltd | Real estate | 2026 |
| C&R Pipeline Solutions Limited | Construction | 2020 |
| C-Comms Ltd | Information & communication | 2025 |
| C-Cure Consulting Ltd | Information & communication | 2014 |
| C. & H. (Barton) Limited | Wholesale & retail | 1958 |
| C.B.(Gunmakers) Limited | Manufacturing | 2006 |
| C.F Smith Ltd | Professional & scientific | 2018 |
| C.J. Owens & Sons Limited | Construction | 1989 |
| C.J. Rossin LLP | | 2015 |
| C.Palmer Engineering Services Ltd | Wholesale & retail | 2023 |
| C.T.S.L Ltd | Health & social care | 2019 |
| C23T Residential Ltd | Real estate | 2023 |
| C3 Cloud City Consultancy Ltd | Information & communication | 2018 |
| C4 Organisation Consulting Ltd | Professional & scientific | 2019 |
| Caber Medical Limited | Health & social care | 2024 |
| Cabhire Bedford Ltd | Administrative & support | 2019 |
| Cabin Installation Ltd | Construction | 2018 |
| Cable Management Warehouse Limited | Wholesale & retail | 2003 |
| Cablemasters UK Limited | Information & communication | 1998 |
| Cabol Technologies Limited | Administrative & support | 2019 |
| Cacchioli Photography Limited | Professional & scientific | 2019 |
| CAD Contracting & Consultancy Ltd | Professional & scientific | 2009 |
| CAD Sauce Ltd | Professional & scientific | 2025 |
| Caddie Limited | Information & communication | 2003 |
| Cadwell Construction Ltd | Manufacturing | 2019 |
| Cadwell Court Management (Hitchin) Limited | Households | 1971 |
| Caelo Group Limited | Professional & scientific | 2024 |
| Caesar Homes Ltd | Construction | 2019 |
| Caesar Services Ltd | Administrative & support | 2016 |
| Cafe Bali Ltd | Hospitality | 2025 |
| Cafe Grill Afro-Caribbean Restaurant Limited | Hospitality | 2025 |
| Cafe India (Weymouth) Limited | Hospitality | 2003 |
| Cafe ST Lisi Ltd | Hospitality | 2024 |
| Caffe Piccolo and Bakery Limited | Hospitality | 2026 |
| Caffè Riccio Ltd | Wholesale & retail | 2024 |
| Cagin Ltd | Wholesale & retail | 2025 |
| CAI BA Food Limited | Hospitality | 2026 |
| CAI Transport Limited | Transport & logistics | 2018 |
| Cairndev Ltd | Construction | 2023 |
| Cais Design Limited | Extraterritorial | 2011 |
| CAJ Coaching Ltd | Arts & recreation | 2025 |
| CAK Care Ltd | Health & social care | 2022 |
| Cake Time Limited | Transport & logistics | 2019 |
| Cake-A-Licious (KG) Ltd | Manufacturing | 2021 |
| Cakealicious (UK) Ltd | Manufacturing | 2008 |
| Cakestand Baking Ltd | Manufacturing | 2022 |
| Calcula Limited | Professional & scientific | 2015 |
| Caldecotte Lakeside Management Limited | Households | 2025 |
| Caleffi Limited | Other services | 2026 |
| Calico Play Limited | Wholesale & retail | 2026 |
| Call Parker Limited | Administrative & support | 2009 |
| Callbak Ltd | Administrative & support | 2025 |
| Cally Jane Limited | Arts & recreation | 2019 |
| Calm Accountancy Ltd | Professional & scientific | 2023 |
| Calm Reflection Ltd | Health & social care | 2013 |
| Calmdesk Ltd | Information & communication | 2026 |
| Calminspire Ltd | Health & social care | 2006 |
| Calorie Watchers Limited | Manufacturing | 2014 |
| Calp Holdings Limited | Hospitality | 2025 |
| Calvert Close Management Company Ltd | Households | 2017 |
| CAM Autos Bedford Ltd | Wholesale & retail | 2021 |
| Camara Homes Ltd | Real estate | 2025 |