| Citymatrix Ltd | Wholesale & retail | 2026 |
| Cityscape (Gibraltar) Ltd | Administrative & support | 2011 |
| Cityscape Maps Limited | Administrative & support | 2003 |
| Civil Defence Supply Limited | Public administration | 1998 |
| Civile Engineering Ltd | Construction | 2021 |
| CJ Electrical (Lincs) Ltd | Construction | 2023 |
| CJ Plant and Civils Ltd | Administrative & support | 2017 |
| CJ Spindle Limited | Hospitality | 2025 |
| CJ Upvc Installations Ltd | Construction | 2021 |
| Cjdlettings Limited | Real estate | 2023 |
| Cjfsm Ltd | Wholesale & retail | 2018 |
| CJH Developments (Lincs) Limited | Financial services | 2009 |
| CJS Builders Ltd | Construction | 2022 |
| Cjsleisures Ltd | Hospitality | 2025 |
| CKM Property Ltd | Real estate | 2019 |
| Ckmstudios Ltd | Information & communication | 2025 |
| Ckrm Ltd | Transport & logistics | 2025 |
| Claire Armitage R.H.A.D. Limited | Wholesale & retail | 1999 |
| Claire Brumby Business Development Limited | Professional & scientific | 2016 |
| Claire L Wade Limited | Administrative & support | 2016 |
| Claire R Protecter Limited | Wholesale & retail | 2025 |
| Clamp Services Ltd | Construction | 2026 |
| Clanfield Developments Limited | Real estate | 2021 |
| Claptrapmedia Limited | Professional & scientific | 2023 |
| Clarity Home Hub Health Ltd | Health & social care | 2025 |
| Clarke’S Farm Shop Limited | Wholesale & retail | 2025 |
| Clarman Joinery (Lincoln) Ltd | Manufacturing | 2008 |
| Clarus Academy Ltd | Education | 2026 |
| Clarus Private Health Limited | Real estate | 2017 |
| Clasketgate Properties Limited | Real estate | 1958 |
| Classic Cuts Lincoln Limited | Other services | 2003 |
| Classic Dynamo & Regulator Conversions Ltd | Wholesale & retail | 2015 |
| Claudine Domoney Ltd | Health & social care | 2012 |
| Claverings Property Group Ltd | Construction | 2021 |
| Clavien Ltd | Real estate | 2026 |
| Clawson Engineering Services Limited | Professional & scientific | 2011 |
| Clay Lane Properties Limited | Real estate | 2019 |
| Claylands (Two) Ltd | Wholesale & retail | 2017 |
| Clayton's Carpets Limited | Wholesale & retail | 1999 |
| Clayton's Upholstery Limited | Extraterritorial | 1984 |
| Clean Image (Lincoln) Limited | Financial services | 2018 |
| Clean Image Carpet Cleaning Limited | Administrative & support | 2012 |
| Cleancribs Lincs Ltd | Administrative & support | 2025 |
| Cleaning Twenty-Four Seven Ltd | Administrative & support | 2018 |
| Cleanroom Zone Ltd | Extraterritorial | 2026 |
| Clear Blue GAS Limited | Construction | 2006 |
| Clear Cover Taxi Warranties Limited | Financial services | 2026 |
| Clear Cover Warranties Limited | Financial services | 2025 |
| Clear Loop Consulting Ltd | Information & communication | 2019 |
| Clear View Vision Ltd | Administrative & support | 2007 |
| Clearview Data Limited | Information & communication | 2025 |
| Cleatham Hall Hotel LLP | | 2012 |
| Clee Mortgage & Protection Advice Limited | Financial services | 2014 |
| Clee Property Management Ltd | Households | 2022 |
| Clements Young Aviation Ltd | Administrative & support | 2025 |
| Clements Young Holdings Ltd | Financial services | 2025 |
| Clements Young Ltd | Administrative & support | 2018 |
| Cleo Allan Edpsych Ltd | Professional & scientific | 2024 |
| Cleobury Estates Limited | Real estate | 2000 |
| Clesham Ltd | Health & social care | 2010 |
| Cleveland Trading & Consultancy Limited | Professional & scientific | 1988 |
| Clia'N'Clean Ltd | Administrative & support | 2024 |
| Clia-Clean Limited | Administrative & support | 2026 |
| Clickora 3 Ltd | Wholesale & retail | 2025 |
| Cliff Farm Developments Ltd | Construction | 2025 |
| Cliff Farm Estates Limited | Professional & scientific | 2022 |
| Cliff Farm Properties Ltd | Real estate | 2025 |
| Cliff Farm Trading Limited | Professional & scientific | 2022 |
| Cliff Top Homes Ltd | Real estate | 2023 |
| Cliff Tree Services Ltd | Agriculture & fishing | 2005 |
| Clifford and Sons 84 Ltd | Wholesale & retail | 2024 |
| Cliffside Windows (Dunston) Limited | Administrative & support | 2012 |
| Clifftop Kennels Limited | Other services | 2014 |
| Clifton Logistics Ltd | Transport & logistics | 2026 |
| Clifton Place Investments Ltd | Real estate | 2023 |
| Clifton Welding Services Limited | Professional & scientific | 2006 |
| Climacore Hvacr Limited | Construction | 2026 |
| Climb Design Ltd | Information & communication | 2020 |
| Clinical Yoga Ltd | Education | 2024 |
| Clinton Heating & Plumbing Specialists Limited | Construction | 2015 |
| Clinton Park Residents Company Limited | Households | 1998 |
| Clive Hall Consulting Ltd | Professional & scientific | 2022 |
| Clnlog Services Ltd | Transport & logistics | 2026 |
| Clockwise Restorations Limited | Professional & scientific | 2022 |
| Cloud 9 (Lincs) Limited | Administrative & support | 2013 |
| Cloud Collaboration Ltd | Wholesale & retail | 2018 |
| Cloud Lettings Ltd | Real estate | 2015 |
| Cloud Store 1 Ltd | Wholesale & retail | 2025 |
| Cloughmore Limited | Hospitality | 2017 |
| Clovelly Path Limited | Other services | 2023 |
| Cloverleaf Development Company Limited | Construction | 2002 |
| Clsouth Limited | Arts & recreation | 2023 |
| Clumber Homes Ltd | Real estate | 2022 |
| Clumber House (Lincoln) Management Company Limited | Households | 2014 |
| CLV Mortgages Lincoln Limited | Financial services | 2017 |
| CM & AM Developments Limited | Construction | 2019 |
| CM Civils & Surveys Ltd | Construction | 2020 |
| CM Machines Ltd | Financial services | 2023 |
| CM3 Property Ltd | Real estate | 2025 |
| CMB Builders Lincoln Ltd | Construction | 2019 |