| Consult IT Limited | Information & communication | 1998 |
| Consultantsea Limited | Transport & logistics | 2011 |
| Consultus Insurance Brokers Ltd | Financial services | 2020 |
| Contour Engineering Services Ltd | Manufacturing | 2017 |
| Contract Design Studio Limited | Wholesale & retail | 2001 |
| Controls Process Services Limited | Administrative & support | 2010 |
| Conveni Food Ltd. | Wholesale & retail | 2017 |
| Convenient Care Ltd | Health & social care | 2026 |
| Convert Extend UK Limited | Construction | 2024 |
| Convert-A-Van Ltd | Extraterritorial | 2014 |
| Convext Ltd | Transport & logistics | 2020 |
| Cook Naked Ltd | Hospitality | 2021 |
| Cookham Inns Limited | Hospitality | 2025 |
| Cooper & Company Soft Furnishings Ltd | Manufacturing | 2024 |
| Cooper & Wakefield Ltd | Construction | 2024 |
| Copgamma Limited | Real estate | 1998 |
| Copia Investments Ltd | Professional & scientific | 2014 |
| Copper Beech Homes Ltd | Real estate | 2021 |
| Copperidge Developments Limited | Construction | 2010 |
| Core Compass Studios Ltd | Arts & recreation | 2025 |
| Core Range UK Ltd | Professional & scientific | 2020 |
| Cormek Solutions Ltd | Administrative & support | 2018 |
| Corner Hub Limited | Hospitality | 2026 |
| Cornerstone UK Holdings Limited | Financial services | 2025 |
| Corrugated Caskets Limited | Manufacturing | 2016 |
| Cosmetic Kingdom Limited | Wholesale & retail | 2011 |
| Cosmopolitan Midlands Limited | Administrative & support | 2014 |
| Coso Group Ltd | Professional & scientific | 2026 |
| Coto Consultancy Limited | Financial services | 2024 |
| Cotswold K9 & Equine Care Ltd | Agriculture & fishing | 2020 |
| Cotswolds Engineering Consultants Limited | Professional & scientific | 2023 |
| Cotteridge Commercial Insurance Brokers Limited | Financial services | 2003 |
| Cotton Catering Limited | Other services | 2013 |
| Cotton PUB Co Limited | Other services | 2018 |
| Country Roofing Ltd | Construction | 2013 |
| Countryside Aquatics & Drives Ltd | Construction | 2010 |
| Court Garden House Limited | Hospitality | 2020 |
| Courtyard Eatery C.I.C. | Hospitality | 2021 |
| Covertech Midlands Ltd | Wholesale & retail | 2006 |
| Covprotec Limited | Manufacturing | 2016 |
| COX & Clarke Group Limited | Wholesale & retail | 2025 |
| Cozy Climate Systems Ltd | Energy | 2025 |
| Cozykids Ltd | Wholesale & retail | 2020 |
| CP Project 1 Ltd | Energy | 2025 |
| CP Project Holdings Ltd | Energy | 2024 |
| CPM Holdings Group Ltd | Financial services | 2018 |
| CR Steel Construction Ltd | Manufacturing | 2019 |
| Crackerjack Training Limited | Education | 2004 |
| Craddocks Nurseries Limited | Wholesale & retail | 1988 |
| Crafted Campers (Midlands) Limited | Manufacturing | 2026 |
| Crafted Cottages Limited | Real estate | 2026 |
| Craimar Limited | Manufacturing | 2011 |
| Crates and Cases Redditch Ltd | Manufacturing | 2025 |
| CRE8 a Space Ltd | Construction | 2022 |
| Creasefield Limited | Administrative & support | 2019 |
| Create Storage Limited | Real estate | 2012 |
| Creativ Supplements Ltd | Manufacturing | 2026 |
| Creative Korner Ltd | Manufacturing | 2024 |
| Creative Logistix Solutions Limited | Transport & logistics | 2018 |
| Creative Occupational Therapy Solutions Limited | Health & social care | 2014 |
| Creative Physiotherapy Ltd. | Health & social care | 2021 |
| Crees Fulford Limited | Financial services | 2023 |
| Crestline Logistics Limited | Transport & logistics | 2025 |
| Crestwell Ltd | Wholesale & retail | 2026 |
| Crina Cleaning Services Ltd | Administrative & support | 2022 |
| Crippsland Ltd | Professional & scientific | 2023 |
| CRK Productions Limited | Arts & recreation | 2014 |
| Croft Capital UK Asset Management Ltd | Administrative & support | 2015 |
| Croots Juices Ltd | Wholesale & retail | 2026 |
| Cross & Richmond Engineering Limited | Professional & scientific | 2015 |
| Cross Cart INT Ltd | Wholesale & retail | 2026 |
| Cross Country Motor Sport Agency Limited | Arts & recreation | 1993 |
| Crowd Safety Training and Consultancy Worldwide Limited | Education | 2017 |
| Crowhurst Haulage Ltd | Transport & logistics | 2020 |
| Crowlas Holdings Ltd | Real estate | 2025 |
| CRP Access Solutions Limited | Information & communication | 2014 |
| CRR Trading Ltd | Wholesale & retail | 2025 |
| CRS Computer Services Limited | Information & communication | 2016 |
| CRS Fabrications Limited | Manufacturing | 2020 |
| Cruise.Co (Holdings) Limited | Administrative & support | 2012 |
| Cruise.Co Finco Limited | Administrative & support | 2017 |
| Cruise.Co Group Limited | Professional & scientific | 2020 |
| Cruise.Co.Uk Limited | Administrative & support | 2005 |
| Cruisereaderoffers.Co.Uk Limited | Extraterritorial | 2007 |
| Cruises.Co.Uk Limited | Extraterritorial | 2007 |
| Crusader Direct Ltd | Wholesale & retail | 2026 |
| Cruslobo Limited | Financial services | 2025 |
| CRW Enforcement Services Limited | Administrative & support | 2008 |
| Cryptic Ltd | Professional & scientific | 2019 |
| Crystal Heart Visions Limited | Other services | 2013 |
| Crystal Panda Redditch Limited | Hospitality | 2024 |
| Csbn Ltd | Construction | 2009 |
| CSC Bookkeeping Services Ltd | Professional & scientific | 2024 |
| CSC Transport Ltd | Transport & logistics | 2022 |
| Csct Consultancy Ltd | Administrative & support | 2024 |
| Csdb Limited | Construction | 2006 |
| CSG Consulting Engineers Ltd | Professional & scientific | 2014 |
| CST Property Investment Limited | Real estate | 2021 |
| CT Fire Risk Management & Protection Ltd | Financial services | 2023 |
| CT Group Search Solutions Limited | Administrative & support | 2017 |