| Clover Bidco Limited | Information & communication | 2020 |
| Clover Club Property Ltd | Real estate | 2023 |
| Clover Topco Limited | Information & communication | 2020 |
| Clovermore Events Ltd | Other services | 2025 |
| Clower & SON (Builders' Merchants) Limited | Wholesale & retail | 1977 |
| Clower Developments Limited | Real estate | 1954 |
| Clowns Early Years Centres Limited | Administrative & support | 2002 |
| Clrbc Properties Limited | Households | 2023 |
| Club Physio CPD Ltd | Education | 2007 |
| Club Redd Ltd | Other services | 2025 |
| Clubhouse World Limited | Hospitality | 2023 |
| Clubs Away Limited | Information & communication | 2014 |
| Cluck Brothers Limited | Hospitality | 2020 |
| Cluckify Limited | Hospitality | 2025 |
| Clumba Bars Ltd | Hospitality | 2020 |
| Clumber Bars Limited | Hospitality | 2007 |
| Clumber Court Management Company Limited | Real estate | 2006 |
| Clumber Developments Limited | Real estate | 1995 |
| Clumber House Management Company Limited | Households | 1995 |
| Clumber Renovations Ltd | Real estate | 2024 |
| Clutch & Co Kids Ltd | Wholesale & retail | 2025 |
| Clyde Cleaning Ltd | Administrative & support | 2025 |
| Clyndon Resources Ltd | Wholesale & retail | 2024 |
| CM Costing Limited | Professional & scientific | 2015 |
| CM Earthworks and Civils Limited | Construction | 2024 |
| CM Go Ltd | Transport & logistics | 2024 |
| CM Group Stock Limited | Other services | 2021 |
| CM Private Coaching Ltd | Other services | 2026 |
| CM Reinforcement Ltd | Extraterritorial | 2016 |
| CM Retail Limited | Other services | 2020 |
| CM2 Consulting (UK) Limited | Professional & scientific | 2009 |
| CMA Solar Installations Ltd | Construction | 2024 |
| Cmac Homes Ltd | Real estate | 2025 |
| CMB Healthcare Holdings Ltd | Financial services | 2021 |
| CMB Kitchen and Bathrooms Limited | Construction | 2022 |
| CMB Mechanical Limited | Wholesale & retail | 2018 |
| CMB Proprty Ltd | Real estate | 2024 |
| CMB Telecom Services Limited | Information & communication | 2007 |
| CMC Property Holdings Limited | Real estate | 2018 |
| CMD Project Management Limited | Public administration | 2007 |
| CMD Property Management Ltd | Real estate | 2025 |
| Cmec 4 Skips Limited | Water & waste | 2022 |
| Cmec Demolition Limited | Construction | 2002 |
| Cmec Environmental Limited | Water & waste | 2006 |
| Cmec Skips Limited | Water & waste | 2022 |
| CMF Installations Ltd | Manufacturing | 2016 |
| CMG Marketing Solutions Ltd | Administrative & support | 2025 |
| Cmgc 1922 Limited | Real estate | 1922 |
| Cmia Consultants Limited | Manufacturing | 2015 |
| CML Innovative Technologies Limited | Manufacturing | 1932 |
| CMM (Notts) Ltd | Transport & logistics | 2019 |
| CMR Construct Ltd | Construction | 2026 |
| CMS Driving Services Ltd | Manufacturing | 2025 |
| CMS Lites Property Investments Ltd | Real estate | 2020 |
| CMS Lites UK Ltd | Construction | 2017 |
| CMS Pro Consulting Limited | Information & communication | 2025 |
| Cmtop Property Limited | Real estate | 2015 |
| CMW Engineering (Nottingham) Limited | Manufacturing | 2019 |
| CN Investment Properties Ltd | Real estate | 2023 |
| CN Maintenance Ltd | Construction | 2026 |
| CN Pet Parlour Ltd | Other services | 2025 |
| CN Ventures Limited | Professional & scientific | 2025 |
| CNB Ductwork Ltd | Manufacturing | 2024 |
| CNC Joinery Shop Ltd | Construction | 2020 |
| CNC Lifting Supplies Limited | Manufacturing | 2022 |
| CNC Proz Ltd | Manufacturing | 2025 |
| CNC Technical Services Limited | Manufacturing | 2016 |
| Cnection Ltd | Information & communication | 2019 |
| CNG Commercial Limited | Professional & scientific | 2017 |
| CNG Structural Refurbishment Ltd | Construction | 2020 |
| CNK Finance Limited | Financial services | 2018 |
| CNM Agricultural Services Limited | Wholesale & retail | 2015 |
| CNM Holdings Ltd | Hospitality | 2024 |
| CNR Group Holdings Limited | Professional & scientific | 2005 |
| CNR Properties Limited | Real estate | 2005 |
| CNR Services International Limited | Professional & scientific | 2005 |
| CNS Civils Ltd | Construction | 2022 |
| Cntl Limited | Manufacturing | 2001 |
| Co Consultancy Services Limited | Professional & scientific | 2020 |
| Co Sustain LAB Limited | Manufacturing | 2025 |
| Co-Creation Marketing Ltd | Professional & scientific | 2014 |
| Co-Linear Properties Limited | Real estate | 2023 |
| Co. Chipnah Limited | Health & social care | 2015 |
| Coabe Ltd | Wholesale & retail | 2016 |
| Coach & Horses (Nottingham) Limited | Hospitality | 2010 |
| Coach House Developments (Derby) Limited | Real estate | 2001 |
| Coach House Practice Ltd | Real estate | 2015 |
| Coaching Through Crises Ltd | Professional & scientific | 2022 |
| Coalcloud Ltd | Administrative & support | 2025 |
| Coalesco Accountants Limited | Professional & scientific | 2005 |
| Coalesco Ltd | Extraterritorial | 2012 |
| Coalfields Advisors L.P. | | 2004 |
| Coalite Oils and Chemicals Limited | Professional & scientific | 1937 |
| Coart Living Ltd | Households | 2025 |
| Coastal Chalet Lets Limited | Real estate | 2026 |
| Coating Systems Limited | Wholesale & retail | 2004 |
| Cobac Security Ltd | Administrative & support | 2016 |
| Cobalt Business Solutions Limited | Agriculture & fishing | 2024 |
| Cobalt Capital Management Limited | Real estate | 2025 |
| Cobalt Resource Limited | Professional & scientific | 2013 |