| Cawood Electrical Limited | Construction | 2016 |
| Cawthorpe Estates (Cleethorpes) Limited | Extraterritorial | 2008 |
| Cawthorpe Estates (Grimsby) Ltd | Real estate | 2016 |
| Cawthorpe Estates Limited | Real estate | 2007 |
| CBH Limited | Professional & scientific | 2003 |
| CC Rope Access & Inspection Services Ltd | Professional & scientific | 2022 |
| Cc&La Transport Ltd | Transport & logistics | 2023 |
| Ccl-Solutions Limited | Health & social care | 2015 |
| Ccmc Project Solutions Limited | Other services | 2023 |
| Ccmc Properties Limited | Real estate | 2025 |
| Ccne Trading Limited | Other services | 2020 |
| Ccrenewables Ltd | Energy | 2023 |
| CD Engineering Solutions Ltd | Professional & scientific | 2022 |
| CD Technology Ltd | Wholesale & retail | 2016 |
| CDC Developments Limited | Construction | 2020 |
| Cdls Automotive Ltd | Wholesale & retail | 2014 |
| CDM HSE Support Limited | Construction | 2022 |
| CDS Clean and Go Ltd | Administrative & support | 2023 |
| Cedar Homes(Surrey) Ltd | Construction | 2019 |
| Cedars Homes Ltd | Real estate | 2025 |
| Cenedas Ltd | Information & communication | 2010 |
| Central Car Company (Grimsby) Limited | Manufacturing | 2010 |
| Central Doors Limited | Manufacturing | 2016 |
| Central Insulations EOT Limited | Administrative & support | 2025 |
| Central Insulations Limited | Construction | 1989 |
| Central Insulations Services Limited | Extraterritorial | 2015 |
| Central Promenade Asset Management Limited | Hospitality | 2002 |
| Centre Line Holdings Limited | Agriculture & fishing | 2018 |
| Centre Line Machining Limited | Manufacturing | 2008 |
| CENTRE4 Limited | Administrative & support | 1995 |
| Cercle Holdings Limited | Financial services | 2023 |
| Cezarpik Transport Ltd | Transport & logistics | 2016 |
| Cezmar Ltd | Transport & logistics | 2026 |
| Cfans Properties Ltd | Real estate | 2024 |
| Cfans United Ltd | Administrative & support | 2015 |
| CFV Properties Ltd | Real estate | 2022 |
| CGA Consulting Ltd | Information & communication | 2014 |
| CGE Property Experts Ltd | Real estate | 2016 |
| CH 24WORD Ltd | Transport & logistics | 2016 |
| CH4R Grill Limited | Hospitality | 2025 |
| Chacko Builders Ltd | Construction | 2019 |
| Chacko Cottages Ltd | Hospitality | 2022 |
| Chacko's Drainage Ltd | Other services | 2022 |
| Challis Electrical Limited | Construction | 2020 |
| Chambers Bar GY Ltd | Hospitality | 2025 |
| Chandler Engineering Limited | Construction | 2013 |
| Chandler White Limited | Administrative & support | 2023 |
| Chandos Cleethorpes Limited | Households | 2006 |
| Changing Lives Through Horses Limited | Education | 2025 |
| Chantry Fisheries of Grimsby Limited | Wholesale & retail | 2012 |
| Chaoscrew Ltd | Information & communication | 2025 |
| Chapelfield House Limited | Wholesale & retail | 2024 |
| Chapman Landscapes Limited | Other services | 2003 |
| Chapman's Seafoods Ltd. | Manufacturing | 2007 |
| Chapmansp Ltd | Professional & scientific | 2023 |
| Character Security and Locks Ltd | Other services | 2019 |
| Charge Rural Community Interest Company | Professional & scientific | 2025 |
| Charisma Jonga Ltd | Health & social care | 2014 |
| Charlotte’S Cozy Stitches Ltd | Arts & recreation | 2025 |
| Charm Castle LP | | 2015 |
| Charmika Ltd | Wholesale & retail | 2013 |
| Chartdale Developments Limited | Construction | 1987 |
| Chartdale Properties Limited | Real estate | 2006 |
| Charworth Homes Limited | Construction | 2016 |
| Chase (Barnoldby-Le-Beck) Management Company Limited | Households | 2020 |
| Chathley Limited | Health & social care | 2013 |
| Cheek House Limited | Wholesale & retail | 1996 |
| Chelmsford Company Limited | Hospitality | 2024 |
| Chequered Flag Go-Karting Ltd | Arts & recreation | 2025 |
| Cherry Blossom Hair Salon Ltd | Other services | 2012 |
| Cherry Valley Farms (UK) Limited | Administrative & support | 2020 |
| Cherry Valley Farms Limited | Agriculture & fishing | 1959 |
| Chester Investments Group Limited | Construction | 1972 |
| Chester Investments Limited | Extraterritorial | 2022 |
| Chestnut Farm Equestrian Ltd | Administrative & support | 2020 |
| Chewbacca Properties Ltd | Real estate | 2021 |
| Chicca Limited | Wholesale & retail | 2001 |
| Child Centred Youth Diversion Ltd | Professional & scientific | 2024 |
| Childcare (Grimsby) Limited | Construction | 2002 |
| Childcare Solution (UK) Limited | Education | 2013 |
| Chimes for Lunch Ltd | Hospitality | 2014 |
| Chimexpytha Studios Limited | Information & communication | 2025 |
| China Garden Grimsby Ltd | Hospitality | 2018 |
| Chip Van Limited | Hospitality | 2025 |
| Chippy Ocean Direct Ltd | Wholesale & retail | 2022 |
| Chipshopspares Ltd | Manufacturing | 2026 |
| Chirmarn Services Ltd | Other services | 2020 |
| Chiroactive Limited | Other services | 2014 |
| Chiropractic First Limited | Health & social care | 2014 |
| Chitam Properties Ltd | Real estate | 2025 |
| Chloe Philips Limited | Real estate | 2021 |
| Chloe Warren Limited | Information & communication | 2018 |
| Chris Grocock Limited | Professional & scientific | 2012 |
| Chris Stephenson Limited | Administrative & support | 2014 |
| Chris Wildman Pipefitting Services Limited | Construction | 2024 |
| Chris's Fisheries Limited | Wholesale & retail | 2002 |
| Christian Action and Resource Enterprise | Hospitality | 1993 |
| Christian Centre (Humberside) Limited(The) | Other services | 1979 |
| Chromolume Productions Ltd | Arts & recreation | 2024 |
| Chromolume Theatre Ltd | Arts & recreation | 2022 |