| Budo Construction Group Ltd | Construction | 2026 |
| BUL Interiors Ltd | Construction | 2018 |
| Bumpstead Services Ltd | Professional & scientific | 2018 |
| Burada Care Ltd | Health & social care | 2019 |
| Butler Properties Ltd | Real estate | 2025 |
| Buymyi Ltd | Extraterritorial | 2013 |
| Buyonix Ltd | Wholesale & retail | 2025 |
| BVD Property Ltd | Real estate | 2025 |
| BW Capital (Pharma) Limited | Financial services | 2024 |
| BW Capital Group Limited | Financial services | 2024 |
| BW Vehicle Services Ltd | Wholesale & retail | 2025 |
| C & J Property Services Group Limited | Administrative & support | 2024 |
| C & S Bragg Ltd | Other services | 2015 |
| C and B Zorba Limited | Hospitality | 2026 |
| C I DA Costa & Co Limited | Construction | 2018 |
| C L Garden Services Limited | Administrative & support | 2024 |
| C. J. Petrow International Limited | Wholesale & retail | 1993 |
| Calastudio Ltd | Professional & scientific | 2026 |
| Calfclomp Ltd | Hospitality | 2024 |
| Calford Clinical Ltd | Real estate | 2015 |
| Cambridge Advertising Limited | Professional & scientific | 2024 |
| Cambridge Angling Cabin Limited | Wholesale & retail | 2017 |
| Cambridge Building Projects Ltd | Construction | 2018 |
| Cambridge Carpentry Limited | Construction | 2018 |
| Cambridge Cultural Enterprise Consultants Limited | Professional & scientific | 2016 |
| Cambridge Digital Technology Ltd | Wholesale & retail | 2025 |
| Cambridge Oncometrix Limited | Professional & scientific | 2012 |
| Cambridge Premier Chauffeur Agency LLP | | 2012 |
| Cambridge Reinvestment Ltd | Real estate | 2021 |
| Cambridge Technology Export Communication Ltd | Wholesale & retail | 2011 |
| Cambridge Van Centre Limited | Wholesale & retail | 2024 |
| Cambury Developments Ltd | Construction | 2022 |
| Camclad (Steelwork) Limited | Construction | 2007 |
| Camex Capital Limited | Administrative & support | 2024 |
| Campbell Parker Construction Limited | Construction | 2025 |
| Canard Digital Services Ltd | Information & communication | 2010 |
| Cannon Irons Limited | Real estate | 2012 |
| Care &MED Ltd | Health & social care | 2022 |
| Care Knox Group Ltd | Professional & scientific | 2026 |
| CARP1.COM Limited | Agriculture & fishing | 2005 |
| Castle Fields Pre-School | Education | 2016 |
| Castleburg Construction Ltd | Construction | 2015 |
| Cathcom Ltd | Information & communication | 2007 |
| Caviation Specialist Limited | Professional & scientific | 2025 |
| Cbnine Services Ltd | Administrative & support | 2022 |
| CC & AI Haulage Ltd | Transport & logistics | 2011 |
| Central Security Limited | Administrative & support | 2024 |
| Ceynsu Bookkeeping Home & Garden Decor Ltd | Wholesale & retail | 2020 |
| Cezzaine Ltd | Real estate | 2025 |
| CG4 Investments Ltd | Construction | 2023 |
| CGS (Haverhill) Limited | Manufacturing | 2005 |
| CGS Associates Limited | Construction | 2010 |
| CGS Engineering Services Ltd | Professional & scientific | 2023 |
| Chapel Healthcare Ltd | Health & social care | 2024 |
| Chapel Wealth Management Group Ltd | Professional & scientific | 2022 |
| Charlotte Barrow Chiropractor Limited | Health & social care | 2022 |
| Charltons Interiors Limited | Construction | 2021 |
| Chase Tower Ltd | Financial services | 2018 |
| Cheetahswift Medical Couriers Limited | Transport & logistics | 2025 |
| Cheetahswift Security Limited | Administrative & support | 2026 |
| Chelmstorm Ltd | Real estate | 2023 |
| Chelmwind Ltd | Real estate | 2024 |
| Cherrystone Consulting Ltd | Professional & scientific | 2025 |
| CHF Accounts Ltd | Professional & scientific | 2026 |
| Children's ARK Limited | Financial services | 2005 |
| China Inn 888 Ltd | Hospitality | 2019 |
| China Inn Haverhill Ltd | Hospitality | 2023 |
| Chippy's Ltd | Wholesale & retail | 2003 |
| Chiropractic Health Centres Ltd. | Health & social care | 2008 |
| Chizhavens Limited | Public administration | 2025 |
| Chromatografix Ltd | Professional & scientific | 2024 |
| CI Transfer Company Limited | Real estate | 2023 |
| Ciocan Logistic Ltd | Transport & logistics | 2021 |
| Cipriani Holdings Limited | Health & social care | 2016 |
| City Wide Ltd | Administrative & support | 2020 |
| CJL Race Engineering Ltd | Manufacturing | 2016 |
| Claybyrne Limited | Financial services | 2024 |
| Claytons Tackle Ltd | Wholesale & retail | 2025 |
| Cleaner 4 Hire Ltd | Other services | 2013 |
| Cleanroom Solutions Limited | Administrative & support | 2000 |
| Clear Home Solutions Ltd | Water & waste | 2024 |
| Clearline Umbrella Ltd | Administrative & support | 2023 |
| Cleartax & Accounting Ltd | Professional & scientific | 2009 |
| Clifton-Brown Events Limited | Real estate | 2016 |
| CMS 29 Ltd | Extraterritorial | 2025 |
| Cognition Global Concepts Limited | Professional & scientific | 2010 |
| Cohenv Company Limited | Wholesale & retail | 2022 |
| Colne Valley Road Holdings Limited | Financial services | 2025 |
| Comar Group Ltd | Administrative & support | 2016 |
| Comar Investments Limited | Professional & scientific | 2012 |
| Comar Optics Limited | Manufacturing | 2013 |
| Compass Financial Solutions Limited | Financial services | 2001 |
| Compleat Enterprises Ltd | Arts & recreation | 2011 |
| Complete Plumbing and Heating Solutions Limited | Construction | 2017 |
| Compressive Materials Limited | Manufacturing | 2025 |
| Construx Creations Ltd | Construction | 2024 |
| Cookology Appliances Limited | Extraterritorial | 2021 |
| Cooper Black Limited | Information & communication | 2018 |
| Cootes Farm 2016 Limited | Professional & scientific | 2016 |
| Copiers On-Line Ltd | Administrative & support | 2024 |