| City Wharf Ltd | Real estate | 2019 |
| Cityhub News Ltd | Professional & scientific | 2020 |
| Civil Commercial Solutions Ltd | Construction | 2013 |
| CJC Catering Services Ltd | Hospitality | 2025 |
| Cjfll Ltd | Professional & scientific | 2019 |
| CJG Independent Financial Solutions Limited | Financial services | 2026 |
| CJK (Merseyside) Limited | Hospitality | 2016 |
| Cjkwl Ltd | Professional & scientific | 2021 |
| CJL Accountants Ltd | Professional & scientific | 2025 |
| CJM King Ltd | Construction | 2021 |
| Cjsr Consultants Ltd | Professional & scientific | 2019 |
| CK Residential Lettings Ltd | Real estate | 2013 |
| CK7 Limited | Information & communication | 2014 |
| CKC Packaging Ltd | Wholesale & retail | 2023 |
| CKC Property Limited | Construction | 2018 |
| CL Autos NW Limited | Wholesale & retail | 2012 |
| CL Motor Group Ltd | Wholesale & retail | 2021 |
| CL Properties Southport Limited | Real estate | 2026 |
| Cladar Financial Ltd | Financial services | 2011 |
| Claims Consultancy UK Ltd | Professional & scientific | 2020 |
| Clairville Residents' Association Limited | Households | 1975 |
| Clancy's Confectioners (Clitheroe) Limited | Real estate | 1978 |
| Clare Wright Art Ltd | Wholesale & retail | 2024 |
| Claremont (Ormskirk) Management Co Ltd | Households | 2008 |
| Claremont Gardens Management (Birkdale) Limited | Households | 1995 |
| Clarendon Court (Argyle Road, Southport) Management Company Limited | Households | 1975 |
| Claridge Court Residents Association Limited | Other services | 2011 |
| Clarington Developments Ltd | Real estate | 2014 |
| Clarity Legal Costs Associates Limited | Professional & scientific | 2021 |
| Clarke's Heating & Plumbing (North West) Limited | Construction | 2022 |
| Clay Wholesale Ltd | Hospitality | 2019 |
| Clayfield Health Ltd. | Health & social care | 2018 |
| Clayton Architecture Limited | Professional & scientific | 2015 |
| Clean Genie (Oxford Central) Ltd | Administrative & support | 2020 |
| Clean IT ALL (Northern) Limited | Other services | 2001 |
| Clean-Up UK Limited | Construction | 1995 |
| Cleaneditorganise Limited | Administrative & support | 2023 |
| Cleanman Ltd | Administrative & support | 2020 |
| Cleantouch Limited | Administrative & support | 2010 |
| Clear Choice (NW) Cleaning Co Ltd | Administrative & support | 2024 |
| Clear Reflection Services Ltd | Administrative & support | 2025 |
| Cleeves Landscaping Ltd | Administrative & support | 2021 |
| Clegg Capital Ltd | Real estate | 2021 |
| Clegg Commercial Services Ltd | Manufacturing | 2023 |
| Cleopatra MAK Grill Ltd | Hospitality | 2025 |
| Cleveland Hospitality Consulting Ltd | Professional & scientific | 2019 |
| Clevelli Bay Limited | Manufacturing | 2023 |
| Clinara Healthcare Services Ltd | Health & social care | 2026 |
| Clixels Group Ltd | Information & communication | 2021 |
| Clocking Systems Limited | Wholesale & retail | 2007 |
| Closons Management Limited | Hospitality | 2024 |
| Cloud House Investment Limited | Real estate | 2023 |
| CLOUDY2CLEAR UK Limited | Professional & scientific | 2007 |
| Clover Court Southport RTM Company Limited | Households | 2022 |
| Clover Software Limited | Information & communication | 2022 |
| CLS Autos Ltd | Wholesale & retail | 2019 |
| Club B Ltd | Information & communication | 2023 |
| Club Inc Wigan CIC | Health & social care | 2023 |
| Clumber Alloys Ltd | Wholesale & retail | 2016 |
| CM Griffin Engineers Limited | Professional & scientific | 2011 |
| CMA Business Ltd | Health & social care | 2015 |
| Cmbt Properties Ltd | Households | 2014 |
| CME Accounting Services Limited | Professional & scientific | 2018 |
| CMR Props Ltd | Real estate | 2022 |
| Cnistordrv Ltd | Transport & logistics | 2016 |
| Coach House Holidays (Whitby) Ltd | Real estate | 2018 |
| Coastal Insight Coaching Ltd | Professional & scientific | 2025 |
| Coastline Foundations Ltd | Administrative & support | 2022 |
| Cobalt Blue Business Services Ltd | Professional & scientific | 2015 |
| Cockshott Peck Lewis Limited | Professional & scientific | 2012 |
| Cocktail Crusades Ltd | Administrative & support | 2025 |
| Cocktail One Ltd | Hospitality | 2024 |
| Cocle Limited | Real estate | 2020 |
| Coco Beauty Clinic Ltd | Health & social care | 2018 |
| Coco Boutique Limited | Other services | 2008 |
| COD Mental Health and Wellbeing Services CIC | Health & social care | 2024 |
| Codebay Ltd | Professional & scientific | 2021 |
| Codmore Developments Limited | Construction | 2023 |
| Codmore Ventures Limited | Real estate | 2022 |
| Coffee at the Corner Ltd | Hospitality | 2025 |
| Cogenesco Limited | Professional & scientific | 2015 |
| Coiba Limited | Real estate | 2020 |
| Coin Investment Group Limited | Financial services | 2019 |
| Coldnorth Limited | Administrative & support | 2003 |
| Coldways Refrigeration Ltd | Manufacturing | 2024 |
| Colette Gunter Limited | Real estate | 1988 |
| Collectivity Limited | Administrative & support | 2015 |
| College of Foot Health Ltd | Health & social care | 2017 |
| Collins Consult Limited | Professional & scientific | 2012 |
| Collinson Cares (2021) Ltd | Health & social care | 2021 |
| Collum Holdings Limited | Real estate | 2023 |
| Colour Unlocked Ltd | Wholesale & retail | 2025 |
| Combat Sports UK Ltd | Information & communication | 2022 |
| Combined Facades Ltd | Construction | 2021 |
| Comdevelopment Limited | Information & communication | 1998 |
| Commercial 72 Limited | Administrative & support | 2016 |
| Communicate With Paula Ltd | Health & social care | 2023 |
| Community Care Direct Limited | Health & social care | 2005 |
| Community Link Foundation Ltd | Administrative & support | 2013 |
| Community Sports Coaching and Development | Education | 2014 |