| Bistro Enterprise Ltd | Hospitality | 2016 |
| Black Cat Lasers Ltd | Wholesale & retail | 2023 |
| Black Pearl Consultancy Limited | Professional & scientific | 2013 |
| Blessed Enterprise Ltd | Hospitality | 2015 |
| Blue Pearl Logistics Ltd | Administrative & support | 2020 |
| Blue Ross Limited | Information & communication | 2001 |
| Bluegates Farming Enterprises Limited | Financial services | 2010 |
| Bohola Consulting Limited | Professional & scientific | 2025 |
| Brennan Estates Ltd. | Real estate | 2022 |
| Brian Pinder-Ayres Limited | Professional & scientific | 2013 |
| Bridge House Dental Practice Ltd | Health & social care | 2014 |
| Bridgeman Construction Limited | Construction | 2019 |
| Bright Bridges SEN Support CIC | Health & social care | 2025 |
| Brooker Limited | Information & communication | 2023 |
| Brookerton Limited | Professional & scientific | 2025 |
| Broomco (1356) Limited | Professional & scientific | 1997 |
| BSS Manufacturing Limited | Manufacturing | 2019 |
| BTR Plumbing Limited | Construction | 2026 |
| Bucci and Wesley Limited | Real estate | 2021 |
| Bulldogz TS Ltd | Manufacturing | 2019 |
| Butterfield Court Management Ltd | Households | 2016 |
| C J B 93 Limited | Professional & scientific | 2012 |
| Cableworks Ltd | Construction | 2025 |
| Cactus TV Limited | Information & communication | 1994 |
| Calmstatus Limited | Extraterritorial | 1995 |
| Cambrand Consulting Limited | Professional & scientific | 2023 |
| Cambridge Care Services Limited | Administrative & support | 2015 |
| Cambridge Smile Studio Limited | Health & social care | 2007 |
| Cambridgeshire Chock Shop Ltd | Wholesale & retail | 2024 |
| Camscience Limited | Other services | 2013 |
| Candid Coaching Ltd | Education | 2023 |
| Cardel Group Limited | Financial services | 2017 |
| Carruthers & Co Limited | Professional & scientific | 2012 |
| Cartmell Consulting Services Limited | Professional & scientific | 2025 |
| Catalpa Cyber Ltd | Information & communication | 2024 |
| Cbora Freehold Limited | Households | 2003 |
| CGT Holdings Ltd | Financial services | 2025 |
| Chan & Sons Limited | Professional & scientific | 2023 |
| Chapel Mews Limited | Real estate | 1994 |
| Chapmans of Baldock Ltd | Wholesale & retail | 2024 |
| Charles Cleghorn Limited | Wholesale & retail | 2007 |
| Cheers Cocktails Ltd | Wholesale & retail | 2021 |
| Cherrybottoms Ltd | Wholesale & retail | 2020 |
| Chimemill Limited | Wholesale & retail | 1996 |
| Chirpy Mood Science Ltd | Health & social care | 2025 |
| Chow Pizza Ltd | Extraterritorial | 2021 |
| CHQ Architects Limited | Professional & scientific | 2000 |
| CHQ Group (UK) Limited | Financial services | 2003 |
| CHQ Group Trustees Limited | Administrative & support | 2023 |
| Chris Frazer Smith Photography Limited | Professional & scientific | 1993 |
| Christchurch Baldock | Other services | 2013 |
| Christys Kitchen Ltd | Manufacturing | 2022 |
| Church Mews (Baldock) Management Limited | Real estate | 2004 |
| CJA Building Ltd | Construction | 2022 |
| Clarity Coaching With Louise Ltd | Professional & scientific | 2023 |
| Clear Medical Solutions Limited | Administrative & support | 2012 |
| Cloudy Planet Limited | Professional & scientific | 2023 |
| CLT Holdings Ltd | Financial services | 2025 |
| Cntrl Entertainment Ltd | Arts & recreation | 2025 |
| Colour Dimensions Limited | Professional & scientific | 2023 |
| Comfort From Joy Limited | Wholesale & retail | 2013 |
| Compacct Businesses Limited | Financial services | 1988 |
| Compassionate Community Ltd | Health & social care | 2026 |
| Consultancy Covered Ltd | Information & communication | 2019 |
| Container Storage Solutions (Charlie) Ltd | Transport & logistics | 2025 |
| Copperloys Limited | Wholesale & retail | 1990 |
| Coram Workforce Modelling Limited | Information & communication | 2012 |
| Courtauld Consulting Limited | Administrative & support | 2024 |
| Coyne Environmental Limited | Professional & scientific | 2024 |
| Crann MOR Developments Limited | Construction | 2015 |
| Creative Chefs CIC | Education | 2023 |
| Crossover Software Ltd | Information & communication | 2017 |
| Crowtree Services Limited | Households | 2025 |
| CS Music Limited | Information & communication | 2003 |
| Cybi Technologies Limited | Information & communication | 2021 |
| D & D Consulting Ltd | Information & communication | 2009 |
| D & R Construction and SON Limited | Construction | 2011 |
| D Quartic Ltd | Professional & scientific | 2023 |
| D. Stutley & Sons Ltd | Financial services | 2021 |
| D.Johnson Limited | Hospitality | 2019 |
| D2 Electrical & Building Services Limited | Construction | 2015 |
| Dalafame Properties Limited | Households | 1988 |
| Dapper Dog Grooming Ltd | Other services | 2025 |
| Dari Brothers Limited | Real estate | 2017 |
| Days of Ashwell Limited | Wholesale & retail | 2003 |
| DB Fire Solutions Ltd | Public administration | 2020 |
| DB Herts Ltd | Hospitality | 2018 |
| DE Clare Mews Management Company Limited | Real estate | 2009 |
| Dear Liza Ltd | Professional & scientific | 2023 |
| Debnam Services Limited | Other services | 2017 |
| Decorum Logistics Limited | Transport & logistics | 2019 |
| Demi-Stag Prime Commodities Limited | Professional & scientific | 2017 |
| Denali Limited | Wholesale & retail | 2003 |
| Dental Surgery Group Limited | Financial services | 2015 |
| DF Consultants Ltd. | Information & communication | 2016 |
| Dine Bangla (UK) Ltd | Real estate | 2012 |
| Displayplan Holdings Limited | Financial services | 2009 |
| Displayplan Limited | Wholesale & retail | 1984 |
| Dizi 1969 Ltd | Hospitality | 2019 |
| DK Social Strategy Consulting Ltd | Professional & scientific | 2026 |