| Chefmaxcelluk Ltd | Hospitality | 2026 |
| Cheight Medical Limited | Health & social care | 2015 |
| Chemfinity Ltd | Professional & scientific | 2024 |
| Chemoxy International Limited | Manufacturing | 1939 |
| Cherry Marine Limited | Information & communication | 1974 |
| Cherry Training Ltd | Education | 2019 |
| Chestnut Property Letting Limited | Real estate | 2024 |
| Chew Construction Ltd | Construction | 2025 |
| Chew the Phat Limited | Hospitality | 2019 |
| Chgl Ltd | Hospitality | 2020 |
| Chi-Gold Ltd | Wholesale & retail | 2026 |
| Chill House Ltd | Manufacturing | 2019 |
| Chilled Travel Limited | Administrative & support | 2024 |
| Chillmaid Electrical Limited | Manufacturing | 2020 |
| Chillmaid Property & Project Management Limited | Professional & scientific | 2020 |
| China WOK 66 Ltd | Hospitality | 2025 |
| Chino's Pizza Limited | Hospitality | 2019 |
| Chipvision Systems Limited | Professional & scientific | 2025 |
| Chishti Ventures Limited | Real estate | 2025 |
| Chivas Consultancy Trading Ltd | Professional & scientific | 2020 |
| Choandco Ltd | Other services | 2025 |
| Choice Property NE Limited | Real estate | 2014 |
| Chorlton Foods UK Limited | Hospitality | 2018 |
| Chris Bayliss Engineering Services Ltd | Professional & scientific | 2018 |
| Chris Buckley Flooring Limited | Construction | 2012 |
| Chris Scott Properties Limited | Real estate | 2014 |
| Chris Storey Sports Limited | Arts & recreation | 2016 |
| Chriscarrolltherapy Ltd | Health & social care | 2020 |
| Christ Power Evangelical Church | Other services | 2024 |
| Christies Hospitality Ltd | Hospitality | 2014 |
| Christmas Cards for Schools Limited | Manufacturing | 2008 |
| Christopher Farman Limited | Construction | 2019 |
| Christopher Hudson Electrical Services Limited | Construction | 2013 |
| Christos Kitchen Ltd | Hospitality | 2025 |
| Chubby Panda Ltd | Hospitality | 2024 |
| Church Lane Builders Limited | Construction | 2012 |
| Church Lane Nunthorpe Management Company Limited | Households | 2017 |
| Churchfield Local Ltd | Wholesale & retail | 2020 |
| Churchillbeacon Ltd | Hospitality | 2023 |
| Churchwood Property Ltd | Real estate | 2024 |
| CIA Fabrications Limited | Manufacturing | 2026 |
| Ciaengineering Ltd | Professional & scientific | 2025 |
| CIB Consultancy Services Ltd | Financial services | 2026 |
| Ciber 3 Limited | Construction | 2016 |
| Cipher Cycles Limited | Professional & scientific | 2024 |
| Circle Around Limited | Construction | 2024 |
| Citacoms Ltd | Information & communication | 2026 |
| Citron Group Ltd | Wholesale & retail | 2024 |
| City First Security Services Ltd | Administrative & support | 2018 |
| City Mini Market North Ormesby Ltd | Wholesale & retail | 2025 |
| Citylive Films Ltd | Information & communication | 2024 |
| Citylive Radio C.I.C. | Information & communication | 2022 |
| CJ Parkin Logistics Ltd | Transport & logistics | 2025 |
| CJH Lifting Services Limited | Other services | 2018 |
| CJH Wind Solutions Ltd | Construction | 2025 |
| Cjlangley Ltd | Construction | 2024 |
| CJM Construction (NE) Limited | Professional & scientific | 2024 |
| CJS (North) Ltd | Professional & scientific | 2024 |
| CJS Holdings NE Ltd | Financial services | 2019 |
| CJW Railways Ltd | Construction | 2019 |
| CK Damp Specialist Ltd | Construction | 2022 |
| CK Site Services Ltd | Construction | 2025 |
| CKA Rigging and Lifting Services Limited | Mining & quarrying | 2018 |
| CLA Safety Solutions Limited | Professional & scientific | 2020 |
| Cladders Ltd | Construction | 2023 |
| Clamber Industrial Ltd | Construction | 2022 |
| Clan Doyle Ltd | Information & communication | 2018 |
| Clarime Properties Ltd | Real estate | 2025 |
| Clarion Homes Holdings Limited | Financial services | 2025 |
| Clarion Homes Limited | Construction | 1986 |
| Clarity Project Controls Ltd | Professional & scientific | 2020 |
| Clarity Psychology Limited | Health & social care | 2009 |
| Clark & Beau Limited | Wholesale & retail | 2019 |
| Clarke Financial Ltd | Financial services | 2025 |
| Clarks QS Services Ltd | Professional & scientific | 2024 |
| Classacttextiles Limited | Wholesale & retail | 2025 |
| Classneat Limited | Manufacturing | 1992 |
| Classone Transport Ltd | Transport & logistics | 2025 |
| CLD Training Ltd | Education | 2019 |
| Cldetail Ltd | Transport & logistics | 2025 |
| Clean and Shine Properties Ltd | Real estate | 2026 |
| Clean Machine Detailing Ltd | Other services | 2023 |
| Clean Valley NE Ltd | Administrative & support | 2025 |
| Clean YE Bins Ltd | Administrative & support | 2026 |
| Cleaning Flory Ltd | Administrative & support | 2026 |
| Cleaning Lords Ltd | Manufacturing | 2026 |
| Cleaning Services DS Ltd | Construction | 2025 |
| Clear Head Therapy Ltd | Health & social care | 2024 |
| Clear Path Services NE Ltd | Professional & scientific | 2022 |
| Clear Scope Solutions Ltd | Transport & logistics | 2022 |
| Clear View Assessments Ltd | Health & social care | 2024 |
| Clearpath SHE Solutions Ltd | Professional & scientific | 2026 |
| Cleckheaton Homes Limited | Real estate | 2025 |
| Clements Consulting Limited | Professional & scientific | 2024 |
| Clements Medicolegal Consulting Limited | Health & social care | 2012 |
| Clemtec Limited | Other services | 2007 |
| Cleveland Cable Company (East) Limited | Extraterritorial | 2018 |
| Cleveland Cable Company (Holdings) Limited | Financial services | 2012 |
| Cleveland Cable Company (North) Limited | Extraterritorial | 2018 |
| Cleveland Cable Company (West) Limited | Extraterritorial | 2018 |