| Charnwood Medical Consultancy Limited | Health & social care | 2023 |
| Charter Manor Designs Limited | Construction | 1997 |
| Charters Education Support Ltd | Education | 2024 |
| Checkland Holdings Ltd | Health & social care | 2026 |
| Cherrybrook Properties Ltd | Real estate | 2021 |
| Chert Limited | Financial services | 2017 |
| Cherub Investments Limited | Real estate | 2019 |
| Chilled Food Associates Limited | Professional & scientific | 2015 |
| Chipmunks Day Nursery (Gloucester) Ltd | Health & social care | 2021 |
| Chloe Cousins Ltd | Education | 2020 |
| Choceese Ltd | Manufacturing | 2023 |
| Chorus Cubed Health Ltd | Health & social care | 2026 |
| Chris Lewis Marketing Limited | Professional & scientific | 2018 |
| Christel House Europe | Education | 2000 |
| Christians Tiling Services Ltd | Construction | 2014 |
| Christine Enterprises Limited | Real estate | 2013 |
| Chunky Chairs Ltd | Manufacturing | 2018 |
| Church Farm Billesdon Limited | Construction | 2019 |
| Churchill Waste Solutions Limited | Wholesale & retail | 2002 |
| Cinema @ Home Ltd | Wholesale & retail | 2021 |
| Cinnamon Lounge (Midlands) Ltd | Hospitality | 2022 |
| Circular Connect Limited | Information & communication | 2025 |
| CIS Systems Ltd | Information & communication | 2013 |
| City and Commercial Ltd | Financial services | 1993 |
| CJ Ingles Consulting Ltd | Professional & scientific | 2026 |
| CJ Sweepers (Leices) Limited | Construction | 2024 |
| CJH Aggregate Ltd | Mining & quarrying | 2019 |
| CJH Davies & Sons Ltd | Extraterritorial | 2016 |
| Claire's Cafe Ltd | Hospitality | 2019 |
| Clan Ceramics Ltd | Extraterritorial | 2007 |
| Clan Group Holdings Ltd | Professional & scientific | 2018 |
| Clandon Park Limited | Extraterritorial | 2016 |
| Clandon Park Property Limited | Construction | 2018 |
| CLANN41 Ltd | Professional & scientific | 2024 |
| Clash Events Limited | Households | 2016 |
| Classic Refurbishments Ltd | Manufacturing | 2022 |
| Clear Sky Therapies Ltd | Health & social care | 2024 |
| Clear the Air Devices Ltd | Manufacturing | 2025 |
| Clegg's Couples Counselling and Psychotherapy Service Ltd | Health & social care | 2020 |
| Clerk Technologies Limited | Information & communication | 2025 |
| Clever CUT Limited | Wholesale & retail | 2007 |
| Click Paraplanning Ltd | Administrative & support | 2021 |
| Clicktrips Ltd | Transport & logistics | 2023 |
| Climate Care Systems Ltd | Manufacturing | 2013 |
| Clinch Limited | Information & communication | 2010 |
| Clodian Management Services Limited | Other services | 2017 |
| Cloud 10 Consultancy Limited | Professional & scientific | 2011 |
| Cloud Factory Publications Limited | Information & communication | 2014 |
| Cloud Intellect Limited | Professional & scientific | 2014 |
| Cluny Estates Limited | Real estate | 2000 |
| CMR Services Ltd | Professional & scientific | 2015 |
| Coaching 360 Limited | Professional & scientific | 2019 |
| Coast Property Ltd | Real estate | 2020 |
| Coco & Blue Interiors Ltd | Professional & scientific | 2024 |
| Code Red Software Limited | Information & communication | 2012 |
| Coherence Ltd | Manufacturing | 2026 |
| Coleman FS Limited | Financial services | 2023 |
| Collaborate Research Limited | Administrative & support | 2013 |
| Collaborative Recruitment Consultants Ltd | Administrative & support | 2024 |
| Colligere Ltd | Administrative & support | 2026 |
| Commesso Limited | Professional & scientific | 2016 |
| Commit Software Ltd | Professional & scientific | 2025 |
| Communication Pure and Simple! Ltd | Professional & scientific | 2014 |
| Community Research Limited | Other services | 2008 |
| Comparisonly Limited | Financial services | 2019 |
| Complete Auto Solutions (Market Harborough) Limited | Other services | 2011 |
| Complete Driving Tuition Ltd | Education | 2024 |
| Complete Property Services Rutland Limited | Construction | 2015 |
| Complex Management Services Limited | Households | 1990 |
| Concept Zero Architects Ltd | Professional & scientific | 2013 |
| Concord Interactive Ltd | Information & communication | 2025 |
| Config Consulting Ltd | Information & communication | 2012 |
| Connected Business Partnering Ltd | Professional & scientific | 2020 |
| Connolly Land & Developments (South Midlands) Ltd | Construction | 2015 |
| Connolly Land and Planning Ltd | Professional & scientific | 2008 |
| Conrad Fleming Consulting Ltd | Professional & scientific | 2023 |
| Consult Client UK Limited | Information & communication | 2021 |
| Consumer King Limited | Professional & scientific | 2015 |
| Continuum QA Limited | Administrative & support | 2015 |
| Contra Accounting Ltd | Professional & scientific | 2012 |
| Cooldrove Limited | Professional & scientific | 2009 |
| Cooper Construction Solutions Ltd | Construction | 2016 |
| Cooper Rogers Architects Ltd | Professional & scientific | 2022 |
| Copso Limited | Other services | 2003 |
| Corby Golf Range Limited | Arts & recreation | 1991 |
| Coremn Ltd | Information & communication | 2025 |
| Corporate Architecture Limited | Professional & scientific | 1988 |
| Cottingham Properties Limited | Real estate | 2016 |
| Cotu C Limited | Administrative & support | 2017 |
| Countrywide Bars Limited | Hospitality | 2012 |
| Court House Properties Limited | Real estate | 1989 |
| Cousins Material Management Limited | Professional & scientific | 2026 |
| Cov-Aid Evolutions Ltd | Health & social care | 2020 |
| Coverick Limited | Professional & scientific | 2023 |
| Cowbit Homes Limited | Construction | 2018 |
| CPB Innovation Ltd | Manufacturing | 2024 |
| CPD Assurance Limited | Education | 2022 |
| CPH Holdings Ltd | Financial services | 2019 |
| CQM Training and Consultancy Limited | Professional & scientific | 1993 |
| CR Sportshorse Services Limited | Arts & recreation | 2009 |