| Crown T Couture Ltd | Hospitality | 2024 |
| Crown Taxes Ltd | Professional & scientific | 2023 |
| Crownbridge Capital Finance Limited | Professional & scientific | 2026 |
| Crowncare Wellness Hub CIC | Public administration | 2025 |
| Croxford Construction Ltd | Construction | 2017 |
| Croxford Wine Estates Limited | Agriculture & fishing | 2022 |
| Croydon E Foods Ltd | Hospitality | 2019 |
| CRR Electrical Installations Ltd | Construction | 2026 |
| CRS EDU Ltd | Professional & scientific | 2024 |
| CRS Fitness Limited | Arts & recreation | 2025 |
| CRS Group of Company Ltd | Health & social care | 2023 |
| CRS Real Estate Limited | Real estate | 2026 |
| Crssel Ltd | Construction | 2017 |
| Crucx Ltd | Professional & scientific | 2024 |
| Crydda Ltd | Professional & scientific | 2024 |
| Cryne PUB Co Limited | Hospitality | 2025 |
| Crys Transport Logistic Ltd | Transport & logistics | 2025 |
| Cryss Rotrans Ltd | Transport & logistics | 2023 |
| Crystal 443 Ltd | Other services | 2020 |
| Crystal Cafe Ltd | Hospitality | 2024 |
| Crystal Clean Car Wash Ltd | Other services | 2025 |
| Crystal Clear Group Limited | Manufacturing | 2006 |
| Crystal Creative Limited | Professional & scientific | 2014 |
| Crystal Design 10 Ltd | Administrative & support | 2026 |
| Crystal Design 78 Ltd | Information & communication | 2023 |
| Crystal Eco Cleaners Limited | Other services | 2025 |
| Crystal Hand Car Wash Ltd | Other services | 2015 |
| Crystal Leisure Pools Limited | Other services | 2005 |
| Crystal Motor Company Limited | Wholesale & retail | 2003 |
| Crystal Spedition Ltd | Transport & logistics | 2024 |
| Crystal Tips Limited | Other services | 2010 |
| Crystal Tips Permanent Cosmetics Ltd | Other services | 2018 |
| Crystal Warehouse Limited | Wholesale & retail | 2011 |
| Crystal Windows Northampton Ltd | Construction | 2026 |
| Crystalmews Limited | Manufacturing | 2003 |
| CRZ Consulting 2030 Ltd | Professional & scientific | 2025 |
| CS Consultancy Services Limited | Information & communication | 2008 |
| CS Groundworks and Landscaping Ltd | Construction | 2021 |
| CS Network of Home Care and Support Ltd | Health & social care | 2025 |
| CSC Electrical Limited | Construction | 2012 |
| CSC Plumbing and Heating Ltd | Construction | 2019 |
| Csnorthants Ltd | Wholesale & retail | 2022 |
| CSS Tech Ltd | Information & communication | 2019 |
| Cstnorthamptonshire Ltd | Education | 2021 |
| Csupee Ltd | Construction | 2022 |
| Csvv Ltd | Health & social care | 2017 |
| CT CNC Engineering Solutions Limited | Professional & scientific | 2019 |
| CT Construction Management Limited | Construction | 2017 |
| CT Investments (Holdings) Limited | Financial services | 2024 |
| CT Investments (Northampton) Ltd | Real estate | 2019 |
| CT Region 10 Limited | Other services | 2025 |
| CT Weston Favell Ltd | Other services | 2025 |
| CT11 Construction & Developments Ltd | Construction | 2020 |
| CTC 2019 Limited | Hospitality | 2011 |
| Ctis Consultants Limited | Information & communication | 2015 |
| Ctki Limited | Health & social care | 2020 |
| CTM Garage Ltd | Wholesale & retail | 2021 |
| CTM Services Ltd | Professional & scientific | 2019 |
| CTM Storage Ltd | Wholesale & retail | 2023 |
| CTS Education Limited | Education | 2017 |
| CU Technology Management Limited | Information & communication | 2006 |
| Cube Adventures Limited | Health & social care | 2026 |
| Cube Adventures Living Limited | Health & social care | 2026 |
| Cube Audit Limited | Professional & scientific | 2018 |
| Cube Bistro Ltd | Hospitality | 2024 |
| Cube Construction Limited | Construction | 2003 |
| Cube Incubator Limited | Extraterritorial | 2020 |
| Cube Limited | Professional & scientific | 2021 |
| Cube Partners Limited | Professional & scientific | 2003 |
| Cube Trading Ltd | Wholesale & retail | 2019 |
| CUBE32 Studios Limited | Information & communication | 2008 |
| Cubit Electrical and Mechanical Engineering Limited | Construction | 2008 |
| Cubix Web Solutions Limited | Information & communication | 2010 |
| Cucina DI ZIA Vida Ltd | Hospitality | 2022 |
| Cuisine Kitchen Limited | Hospitality | 2026 |
| Cuisitive Ltd | Professional & scientific | 2011 |
| Culeva Interior Solutions Ltd | Construction | 2023 |
| Culeva Site Solutions Ltd | Construction | 2025 |
| Cullinan Interiors Ltd | Wholesale & retail | 2023 |
| Cullum Consultancy Ltd | Information & communication | 2020 |
| Culpeck Hysom Limited | Professional & scientific | 2009 |
| Cumpii Ltd | Transport & logistics | 2026 |
| Cumuko Limited | Hospitality | 2025 |
| CUP & Wheels Ltd | Transport & logistics | 2014 |
| Cupi Car Park Valeting Ltd | Other services | 2017 |
| Cupi Cleaning Services Limited | Other services | 2017 |
| Cura Care and Support Services Ltd | Health & social care | 2019 |
| Cura Quest Ltd | Professional & scientific | 2014 |
| Curate Solutions Limited | Information & communication | 2008 |
| Curated Goods Limited | Wholesale & retail | 2016 |
| Curb Appeal Limited | Real estate | 2019 |
| Curdon FM Ltd | Construction | 2023 |
| Curlsaura Ltd | Wholesale & retail | 2025 |
| Curly Tails Ltd | Other services | 2016 |
| Curo Holdings LLP | | 2015 |
| Curo Recruitment Limited | Administrative & support | 2025 |
| Curo Wealth Management Ltd | Financial services | 2011 |
| Curran Social Care Limited | Health & social care | 2007 |
| Curry House Northampton Ltd | Hospitality | 2023 |
| Curtis Blinks Consultancy Limited | Professional & scientific | 2015 |