| Butterfly London Limited | Professional & scientific | 2009 |
| Button & Turner Limited | Wholesale & retail | 2012 |
| Buxton Commercial Holdings Limited | Financial services | 2026 |
| Bxcn Ltd | Wholesale & retail | 2018 |
| Bölthorn Consulting Limited | Professional & scientific | 2024 |
| C & C Heating & Plumbing Limited | Construction | 2017 |
| C a Haris Limited | Professional & scientific | 2012 |
| C Cook Electrical Limited | Construction | 2020 |
| C J Harbidge & SON Limited | Transport & logistics | 2010 |
| C R Catton Building Limited | Construction | 2018 |
| C&L Essex Ltd | Professional & scientific | 2012 |
| Cambridge Quality Tuition Limited | Education | 2024 |
| Cambridge Road Flat Management Company Limited | Real estate | 2022 |
| Camp Partners Limited | Professional & scientific | 2019 |
| Camrider Bedford Ltd | Education | 2012 |
| Camrider Harlow Limited | Education | 2010 |
| Canem Limited | Real estate | 2008 |
| Canine Creche Group Ltd | Other services | 2015 |
| Canine DIP and Dive Club Ltd | Administrative & support | 2019 |
| Cannon Chartia Partners Limited | Professional & scientific | 2020 |
| Capital Chambers Limited | Professional & scientific | 2023 |
| Capitalogic Limited | Professional & scientific | 2010 |
| Capricorn Humanitarian & Development Consulting Limited | Professional & scientific | 2015 |
| Captain Concrete Ltd | Extraterritorial | 2016 |
| Car & Commercial Care Limited | Wholesale & retail | 2006 |
| Caravantage Ltd | Construction | 2025 |
| Carbis Engineering Limited | Professional & scientific | 2024 |
| Career Star Group Limited | Administrative & support | 2012 |
| Carey Associates Limited | Information & communication | 2016 |
| Carley & Webb Limited | Real estate | 1995 |
| Carlton Smith Holding Company Limited | Financial services | 2017 |
| Carlton Smith Wills & Estate Planning Limited | Financial services | 2025 |
| Carrot Gold Ltd | Manufacturing | 2018 |
| Carter Insurance Innovations Limited | Professional & scientific | 2016 |
| Carter's Ceramic Designs Ltd | Education | 2002 |
| Casa DI Melfa Limited | Real estate | 2025 |
| Caseron Cloud Accounting Limited | Professional & scientific | 2011 |
| Caseron Online Limited | Professional & scientific | 2013 |
| Cavendish UK Car Sales Limited | Wholesale & retail | 2014 |
| Cavendish UK Properties Limited | Real estate | 2025 |
| CCN Care Ltd | Health & social care | 2021 |
| Cedars Park C.I.C. | Other services | 2011 |
| Century Oak Limited | Manufacturing | 2023 |
| Cerberus Media Group Limited | Professional & scientific | 2025 |
| Cerberus Motor Company Limited | Wholesale & retail | 2019 |
| CFB IT Solutions Ltd | Information & communication | 2016 |
| Cgla Ltd | Health & social care | 2014 |
| Chainhouse Investments Ltd | Real estate | 2019 |
| Chapple Signs Limited | Professional & scientific | 2003 |
| Charles Harvey Associates Limited | Information & communication | 2013 |
| Charles Jones Wealth Management Limited | Financial services | 2016 |
| Charlie Huntingford Racing Ltd | Arts & recreation | 2023 |
| Cheswey Limited | Construction | 2020 |
| Chief Logistics Limited | Transport & logistics | 2000 |
| Chilton Fields Sports Club Limited | Arts & recreation | 2009 |
| China City LIN Ltd | Hospitality | 2025 |
| Chittock’S Transport Limited | Transport & logistics | 2018 |
| Chocolate Tiger Coffee Company Limited | Hospitality | 2013 |
| CHOOSE2ECO Ltd | Manufacturing | 2022 |
| Chrishartcreative Ltd | Professional & scientific | 2018 |
| Christchurch Associates Ltd | Real estate | 2020 |
| Christopher Bigden Limited | Wholesale & retail | 2013 |
| Church View (Bacton) Management Company Limited | Administrative & support | 2003 |
| Church View Dental Practice Limited | Health & social care | 2010 |
| Church View Estate Management Company Ltd | Households | 2007 |
| Ciocoe Limited | Professional & scientific | 2015 |
| Citrus Marketing Ltd | Professional & scientific | 2024 |
| CJG Brickwork Ltd | Construction | 2020 |
| Clapgate Farm Energy Limited | Water & waste | 2014 |
| Clarke Fencing Limited | Construction | 2005 |
| Classic Handtools Limited | Wholesale & retail | 2003 |
| Clicj Controllers Limited | Professional & scientific | 2023 |
| Clicjaid Limited | Professional & scientific | 2024 |
| Clik Dome Systems Limited | Manufacturing | 2013 |
| Clip 'N Climb Ipswich Limited | Arts & recreation | 2018 |
| Clip Consults Limited | Transport & logistics | 2016 |
| Clockhouse Property Ltd | Construction | 2015 |
| Cloudberry Cranbrook Limited | Hospitality | 2017 |
| Clouds on the Ground Limited | Wholesale & retail | 2016 |
| CNL Training Ltd | Health & social care | 2024 |
| Coached for Schools Limited | Education | 2023 |
| Cobb N Co Ltd | Hospitality | 2023 |
| Code-Arc Welding Services Ltd | Construction | 2022 |
| Codeverge Ltd | Information & communication | 2018 |
| Cogent Automation Limited | Administrative & support | 2007 |
| Colemans Blinds and Shutters Ltd | Construction | 2026 |
| Collaborative Solutions Consulting Limited | Professional & scientific | 2005 |
| Combined Power Technical Ltd | Professional & scientific | 2022 |
| Comburere Ltd | Construction | 2024 |
| Coming Home to Roost Ltd | Wholesale & retail | 2026 |
| Commercial Wheel Alignment Limited | Wholesale & retail | 2007 |
| Communities Together East Anglia Ltd | Health & social care | 1991 |
| Community Praxis Ltd | Administrative & support | 2016 |
| Complete Real Estate Investments Limited | Real estate | 2023 |
| Computers by Design Direct Limited | Manufacturing | 2010 |
| Concierge East Limited | Professional & scientific | 2010 |
| Connectbio Innovations Limited | Professional & scientific | 2024 |
| Conservation Policy & Practice Limited | Financial services | 2012 |
| Cooks Wastekare Ltd | Water & waste | 2000 |
| Copperfield Enterprises Limited | Agriculture & fishing | 1986 |