| Bretts Transport Limited | Transport & logistics | 1939 |
| Brian Easey Holdings Ltd | Water & waste | 2017 |
| Brian Easey Transport Limited | Transport & logistics | 2002 |
| Bricey Accountancy Services Limited | Professional & scientific | 2015 |
| Bricey Accounts Limited | Professional & scientific | 2021 |
| Brickford Ltd | Construction | 2019 |
| Bridge Stat Limited | Health & social care | 2018 |
| Bridges the Label Limited | Wholesale & retail | 2022 |
| Brigham Park Farm Ltd | Agriculture & fishing | 2016 |
| Bright Futures Homes Ltd | Health & social care | 2023 |
| Brights Garage (Holbeach) Limited | Wholesale & retail | 2021 |
| Brik - TEK Limited | Extraterritorial | 2014 |
| Brink Medicines Limited | Wholesale & retail | 2008 |
| Britpark Leisure Group Limited | Financial services | 2021 |
| Britpark Leisure Holdings Limited | Arts & recreation | 2014 |
| Britpark Leisure Limited | Arts & recreation | 2001 |
| Brockstone Group Limited | Construction | 2026 |
| Brown Butlin Group Pension Trust Limited | Financial services | 1986 |
| Bruce Close Management Company Limited | Real estate | 2011 |
| Bruller Limited | Wholesale & retail | 2024 |
| Bryant Accounting Services Limited | Professional & scientific | 2007 |
| Brynner Industries Limited | Information & communication | 2012 |
| BSK Developments Ltd | Real estate | 2021 |
| BSK Property Holdings Ltd | Financial services | 2021 |
| BSK Property Investment Ltd | Real estate | 2021 |
| BSK Property Management Ltd | Real estate | 2021 |
| BSW Construction Projects Limited | Construction | 2019 |
| Buddle Brothers Brickwork Limited | Construction | 2021 |
| Build a Brand Ltd | Professional & scientific | 2020 |
| Built Norfolk Limited | Construction | 2025 |
| Bullen Property Investments Limited | Real estate | 2018 |
| Bumble Campers (Rentals) Limited | Administrative & support | 2025 |
| Burley Fluid & Air Limited | Wholesale & retail | 2003 |
| Burley Hydraulics Limited | Professional & scientific | 2005 |
| Burnt Orange Creative Marketing Ltd. | Information & communication | 2013 |
| Burrito to Go Ltd | Hospitality | 2021 |
| Bushcraft and Survival UK Ltd | Wholesale & retail | 2025 |
| Bushell Finance Limited | Financial services | 2017 |
| Bushell Holdings Limited | Financial services | 2017 |
| Bushell Property Development Limited | Construction | 2017 |
| Butler & LE Gallez Properties Limited | Construction | 1986 |
| Buttonhole Fishery Ltd | Arts & recreation | 2026 |
| Buttonhole Lake Limited | Agriculture & fishing | 2017 |
| BW Damp Proofing Limited | Construction | 2024 |
| BWH Ventures Limited | Wholesale & retail | 2014 |
| Bygones Holdings Limited | Financial services | 2022 |
| Byworth Builders Limited | Construction | 2026 |
| C & N Construction (East Anglia) Ltd | Construction | 2024 |
| C Clark Contracting Limited | Agriculture & fishing | 2018 |
| C E Vehicle Repairs Ltd | Wholesale & retail | 2024 |
| C G Elmer Construction Ltd | Construction | 2018 |
| C Isteed Services Ltd | Construction | 2023 |
| C M Rothery Consultancy Services Limited | Professional & scientific | 2017 |
| C S Young Homes Ltd | Construction | 2019 |
| C&E Scaffold Ltd | Construction | 2018 |
| C. P. Allen & SON Transport Limited | Transport & logistics | 2016 |
| C. Plumb Contractors Ltd. | Construction | 2006 |
| C. R. Peggs Limited | Construction | 1945 |
| C. S. Gent & Sons Limited | Agriculture & fishing | 2008 |
| C.A. Noakes Limited | Wholesale & retail | 2002 |
| C.B Veal Utilities Limited | Construction | 2017 |
| C.E. Wing (Farmers) Limited | Agriculture & fishing | 1956 |
| C.P.Rees Limited | Wholesale & retail | 1956 |
| C.T.S. Training & Consultancy Limited | Other services | 2017 |
| Cabnhi Ltd | Financial services | 2025 |
| Cadley Development Limited | Construction | 2018 |
| Cadre Rocket Limited | Other services | 2024 |
| Caerus Care Limited | Health & social care | 2009 |
| Cage Cable Contractors Limited | Extraterritorial | 2016 |
| Cagp Investment Ltd | Manufacturing | 2026 |
| Callum-Andrew Blunden Ltd | Extraterritorial | 2025 |
| Calon Safety Solutions Ltd | Professional & scientific | 2025 |
| Cambridge Dermatology Ltd | Health & social care | 2021 |
| Cambridge Design & Build Limited | Professional & scientific | 2010 |
| Cambridge Helpdesk Limited | Information & communication | 2006 |
| Cambridge Prototypes Ltd. | Professional & scientific | 2014 |
| Cambridgeshire Caravans Limited | Wholesale & retail | 2019 |
| Cambridgeshire Care Agency Limited | Other services | 1995 |
| Cambridgeshire Community Care Limited | Health & social care | 2020 |
| Cambridgeshire Consultancy Services Limited | Wholesale & retail | 2016 |
| Cambridgeshire Facilities Management Limited | Real estate | 2023 |
| Cambridgeshire Flight Training Ltd | Arts & recreation | 2024 |
| Cambridgeshire Straw Pellets Limited | Manufacturing | 2009 |
| Cambridgeshire Straw Supplies Limited | Agriculture & fishing | 2012 |
| Cambridgeshire Van Move Ltd | Hospitality | 2024 |
| Cambs Recycle Ltd | Water & waste | 2024 |
| Camdev Building Services Limited | Construction | 2007 |
| Cameo Royale Cookware Ltd | Wholesale & retail | 2017 |
| Cameron Developments (UK) Limited | Real estate | 2004 |
| Canham Energy Ltd | Construction | 2016 |
| Canine Academy Wisbech Ltd | Agriculture & fishing | 2024 |
| Caninerehabequipment.Co.Uk Ltd | Professional & scientific | 2019 |
| Capitall Solutions Ltd | Professional & scientific | 2025 |
| Caprico Properties Limited | Real estate | 2018 |
| Car Nation (Cambs) Ltd | Wholesale & retail | 2018 |
| Card Gully Ltd | Manufacturing | 2026 |
| Carlton House CAD Ltd | Professional & scientific | 2021 |
| Carnell & Towler Ltd | Hospitality | 2022 |
| Carob Creative Ltd | Professional & scientific | 2016 |
| Carrie Anne Funnell Glass Limited | Administrative & support | 2004 |