| CH Motors & Repairs Ltd | Wholesale & retail | 2025 |
| Chalcot Cardiology Ltd | Health & social care | 2025 |
| Challenger Transport Ltd | Transport & logistics | 2023 |
| Chambray Contract Management Limited | Professional & scientific | 2024 |
| Changing Lives Through Changing Minds CIC | Health & social care | 2017 |
| Chantry-Dammann UK Limited | Manufacturing | 2008 |
| Chapel Down Equestrian Ltd | Agriculture & fishing | 2025 |
| Chapman PDS Ltd | Real estate | 2020 |
| Charcoal Creative Ltd | Arts & recreation | 2023 |
| Charcott Anaesthesia Ltd | Health & social care | 2026 |
| Charlie's Care Services Ltd | Health & social care | 2021 |
| Charnwood Homes Developments Limited | Construction | 2016 |
| Charnwood Park Homes Limited | Administrative & support | 2003 |
| Charterplus Ltd | Administrative & support | 2020 |
| Cheaper Business Solutions Limited | Wholesale & retail | 2019 |
| Checkbuild Limited | Wholesale & retail | 1984 |
| Checkpoint Recovery Limited | Wholesale & retail | 2025 |
| Cheeky Chimps Scunthorpe Ltd | Hospitality | 2008 |
| Chef Linas Ltd | Hospitality | 2023 |
| Chef Zack Feve Limited | Hospitality | 2024 |
| Chequers Residents Association (Scunthorpe) Limited | Households | 1977 |
| Cheshire Technologies Ltd | Wholesale & retail | 2023 |
| Chester House Investments Limited | Financial services | 2023 |
| Chestnut Homes (Partnerships) Limited | Construction | 2016 |
| Chetwood Surgical Limited | Health & social care | 2024 |
| Chicago Pizzeria N Ltd | Hospitality | 2025 |
| Chicane Limited | Wholesale & retail | 2025 |
| Chicken Run SCU Ltd | Hospitality | 2021 |
| Chigide Limited | Administrative & support | 2023 |
| China Town Scunthorpe Ltd | Hospitality | 2021 |
| Chiritatrans Ltd | Transport & logistics | 2025 |
| Chosenrainbow Limited | Financial services | 1998 |
| Chris Chapman Construction Ltd | Construction | 2017 |
| Chris Potton Limited | Administrative & support | 2008 |
| Christian Fletcher Limited | Professional & scientific | 2021 |
| Christof Huber Ltd | Education | 2021 |
| Christopher Tang Limited | Health & social care | 2021 |
| Chroma Golf Limited | Wholesale & retail | 2023 |
| Chrostek Property Ltd | Real estate | 2023 |
| Chubbmix Limited | Manufacturing | 2019 |
| Cidarise-Euchariahorvarthne Ltd | Other services | 2023 |
| Cimpoeru Ionut Ltd | Transport & logistics | 2022 |
| Cimpoeru Transport Ltd | Transport & logistics | 2024 |
| Cinnamon Bangla Ltd | Hospitality | 2025 |
| Circuit Days Ltd | Arts & recreation | 2005 |
| City Barber Shop Ltd | Other services | 2026 |
| Ciugulea Ltd | Transport & logistics | 2024 |
| Ciuzak Trans Ltd | Transport & logistics | 2019 |
| CJ Inspection Limited | Construction | 2020 |
| CJ Norris Limited | Construction | 2020 |
| CJC Industrial Services Limited | Professional & scientific | 2020 |
| CJD Farm Management Limited | Agriculture & fishing | 2012 |
| CJW Transport Ltd | Transport & logistics | 2005 |
| CK Inception Ltd | Professional & scientific | 2021 |
| CKT Haulage and Recovery Limited | Wholesale & retail | 2018 |
| CL Private Hire Ltd | Transport & logistics | 2015 |
| Claff Traders Ltd | Administrative & support | 2024 |
| Clark Installations & Home Improvements Ltd | Construction | 2018 |
| Classic Kitchens & Bathrooms Limited | Construction | 2020 |
| Clay Oven Scunthorpe Limited | Hospitality | 2014 |
| Cleaningcarpets Scunthorpe Ltd | Administrative & support | 2023 |
| Clear Line Desilting Limited | Administrative & support | 2024 |
| CLEAR2HEAR EAR WAX Removal Ltd | Health & social care | 2024 |
| Clearance Experts Lincs Ltd | Administrative & support | 2021 |
| Cleargate Properties Limited | Real estate | 2023 |
| Clearwater Securities Limited | Financial services | 1984 |
| Cleethorpes Plantation Shutters Limited | Wholesale & retail | 2020 |
| Cleveland Build Limited | Construction | 2014 |
| Clever Phones Ltd | Wholesale & retail | 2019 |
| Clicka Ltd | Information & communication | 2026 |
| Cloud Books & Business Ltd | Professional & scientific | 2018 |
| Cloudshed Ltd | Information & communication | 2014 |
| Club Retro Limited | Hospitality | 2025 |
| Clugston Distribution Services Limited | Transport & logistics | 2005 |
| CMC Access Ltd | Administrative & support | 2022 |
| CMC London Ltd | Transport & logistics | 2020 |
| CMD Developments Ltd | Manufacturing | 2015 |
| CME Joinery Limited | Construction | 2017 |
| CMF Access Limited | Professional & scientific | 2015 |
| CMS89 Developments Limited | Real estate | 2025 |
| CMS89 Limited | Construction | 2015 |
| Co-Op Wholesale Limited | Other services | 1970 |
| Coachstar Facilities Ltd | Administrative & support | 2021 |
| Cochrane's Contracting Ltd | Manufacturing | 2025 |
| Cocos Cocos Ltd | Administrative & support | 2025 |
| Codrut&Mary Transport Ltd | Transport & logistics | 2025 |
| Coffee at 43 Limited | Hospitality | 2008 |
| Coggon Brothers Farming Ltd | Financial services | 2021 |
| Coggon Brothers Limited | Agriculture & fishing | 2014 |
| COH (UK) Investments Limited | Real estate | 2023 |
| Coldmac Limited | Professional & scientific | 2001 |
| Coldplace Tribute Ltd | Arts & recreation | 2025 |
| Cole Project Services Ltd | Professional & scientific | 2026 |
| Coleby Ironstone Company Limited (the) | Professional & scientific | 1963 |
| Colin Johnson's Farms Limited | Extraterritorial | 1962 |
| Colin Waters Ltd | Other services | 2013 |
| Commercial Workspace Consultants Ltd. | Construction | 2016 |
| Commercial-Tech Ltd | Manufacturing | 2025 |
| Communities Advice Centre Ltd. | Information & communication | 2012 |
| Complete Building Company (GB) Limited | Professional & scientific | 2001 |