| Cambridge Bespoke Apartments Limited | Hospitality | 2015 |
| Cambridge Scientific Solutions Limited | Professional & scientific | 2002 |
| Cambridgeshire Colorectal Surgery Ltd. | Health & social care | 2013 |
| Cameron Associates Consulting Limited | Professional & scientific | 2025 |
| Camstech Limited | Professional & scientific | 2014 |
| Candid London Limited | Wholesale & retail | 2018 |
| Cansu Zara Limited | Hospitality | 2020 |
| Cantwell & SON Plumbing & Heating Limited | Construction | 2017 |
| Cape-Dent Limited | Education | 2007 |
| Captive Holdings Limited | Financial services | 2025 |
| Carbon 2050 Limited | Professional & scientific | 2013 |
| Carbon Calling CIC | Agriculture & fishing | 2023 |
| Care Advice Centre Limited | Health & social care | 2013 |
| Carl Piergianni Performance Limited | Arts & recreation | 2025 |
| Carmichael Geomatics Ltd | Professional & scientific | 2016 |
| Carousel Nursery Limited | Health & social care | 2018 |
| Carr's Construction Limited | Construction | 2014 |
| Carr's Holding Ltd | Financial services | 2023 |
| Carrick and Company (Stamford) Limited | Professional & scientific | 2015 |
| Carrick Property Company Limited | Real estate | 2015 |
| Carrs-Building Ltd | Construction | 2025 |
| Carters Consultancy Ltd | Professional & scientific | 2017 |
| Casewick Park Limited | Agriculture & fishing | 1998 |
| Casewick Stud Equestrian Limited | Agriculture & fishing | 2016 |
| Casterton College Rutland | Education | 2011 |
| Casterton Food Solutions Limited | Professional & scientific | 2022 |
| Castle Bytham Consultancy Ltd | Professional & scientific | 2023 |
| Castor House Furnished Lettings Ltd | Real estate | 2018 |
| Catalyst-Red Ltd | Extraterritorial | 2006 |
| Caxhall 2024 Limited | Households | 2024 |
| Caxhall Ltd | Construction | 2022 |
| CBM Property Management Limited | Real estate | 2014 |
| CC Associates Limited | Real estate | 2025 |
| Ccgp Holdings Limited | Financial services | 2024 |
| CCI European Power Asset Holdings II LP | | 2021 |
| CCI European Power Asset Holdings LP | | 2019 |
| CCI European Power Asset Holdings Promote Co II LP | | 2020 |
| Ccr&L Inns Ltd | Hospitality | 2013 |
| Cejae Consulting Limited | Professional & scientific | 2020 |
| Celsiius Limited | Professional & scientific | 2024 |
| Central Cafe & Tea Room Ltd | Hospitality | 2019 |
| Central Ice Cream Ltd | Wholesale & retail | 2019 |
| Cetis Developments Limited | Energy | 2004 |
| Chadwick Design Limited | Professional & scientific | 2008 |
| Chainsaw and Hedge Trimmer Service Ltd | Wholesale & retail | 2019 |
| Challinor & Co Limited | Professional & scientific | 2013 |
| Chambers Corporation Limited | Agriculture & fishing | 1959 |
| Chameleon Boutique Limited | Wholesale & retail | 2007 |
| Changewave Consulting Limited | Professional & scientific | 2025 |
| Chaperon Ruiz Art Limited | Arts & recreation | 2023 |
| Charles and Dean Limited | Financial services | 2012 |
| Charleston Marketing Limited | Professional & scientific | 2017 |
| Charlie & Sam's Ltd | Wholesale & retail | 2020 |
| CHARLIEH92 Ltd | Wholesale & retail | 2024 |
| Charrington Tree Services Ltd | Agriculture & fishing | 2024 |
| Chase Torbil Property Ltd | Real estate | 2017 |
| Chater Commercial Ltd | Real estate | 2020 |
| Chef Selection Limited | Administrative & support | 2011 |
| Cherished Group Limited | Professional & scientific | 2022 |
| Cheroy Social Enterprise Limited | Health & social care | 2016 |
| Cherry Jones Limited | Real estate | 2017 |
| Choice Windows Ltd | Construction | 2025 |
| Choicemortgages UK Limited | Financial services | 1999 |
| Chris Dawson Limited | Health & social care | 2014 |
| Chris Robinson Design & Illustration Ltd | Professional & scientific | 2022 |
| Christ Church Mews Management Company Limited | Real estate | 2004 |
| Christine Pirrie Limited | Health & social care | 1992 |
| Chuck Service Ltd | Professional & scientific | 2017 |
| Cimex Lectularius Limited | Other services | 2013 |
| Cirone Health Limited | Health & social care | 2024 |
| Citinet Properties Limited | Hospitality | 1999 |
| Claire Henry Associates Ltd | Health & social care | 2021 |
| Clara Business Solutions Limited | Professional & scientific | 2013 |
| Clare Lodge (Wothorpe) Management Company Limited | Households | 1994 |
| Clarityag Ltd | Professional & scientific | 2025 |
| Class Q Ltd. | Real estate | 2018 |
| Classic Wines Ltd | Real estate | 1998 |
| Claude N. Smith Limited | Construction | 2011 |
| CLC Reinforcements Ltd | Construction | 2015 |
| Clean Courts Ltd | Manufacturing | 2021 |
| Clementine's of Woburn Ltd | Wholesale & retail | 2025 |
| Clements Performance Coaching Ltd | Professional & scientific | 2023 |
| Click the Cloud Limited | Wholesale & retail | 2014 |
| Clifford Properties Limited | Construction | 2015 |
| Cloisters Management (Oakham) Ltd | Households | 2003 |
| Cloud Eight Films Limited | Information & communication | 2008 |
| Cloyne Consultancy Group Ltd | Professional & scientific | 2026 |
| CME Innovations Limited | Information & communication | 2024 |
| CMS UK Services Limited | Professional & scientific | 2002 |
| Coached by Zara Ltd | Arts & recreation | 2023 |
| Coaching on Call Limited | Administrative & support | 2007 |
| Cobblestone Yard Limited | Real estate | 2016 |
| Cobra (Cambs) Operations Limited | Arts & recreation | 2018 |
| Cockatrice Limited | Financial services | 2017 |
| Coco Nini Limited | Wholesale & retail | 2025 |
| Colts Electrical Ltd | Manufacturing | 2021 |
| Combustion Technology International Limited | Manufacturing | 2017 |
| Commercial Kitchen Breakdowns Ltd | Manufacturing | 2022 |
| Communication Lincs Ltd | Education | 2017 |
| Compost Direct Limited | Wholesale & retail | 2009 |