| Cooks Agricultural Services Limited | Agriculture & fishing | 2010 |
| Cope Safety (Holdings) Limited | Professional & scientific | 2015 |
| Copperform Ltd | Real estate | 2019 |
| Copular Ltd | Professional & scientific | 2026 |
| Corcordis Limited | Professional & scientific | 2012 |
| Core Impact Coaching Limited | Health & social care | 2025 |
| Cornpop (Boston) Limited | Professional & scientific | 2011 |
| Corvo Retail Limited | Wholesale & retail | 2022 |
| Cosmo Nexus Limited | Administrative & support | 2021 |
| Cosramtrans Ltd | Transport & logistics | 2022 |
| Cottage Foods (Yorkshire) Limited | Wholesale & retail | 2013 |
| Court Car Park (Boston) Limited | Transport & logistics | 2017 |
| Cowan Holdings Limited | Financial services | 2020 |
| Cowbridge Business Park Limited | Real estate | 2015 |
| Cowern Properties Limited | Real estate | 2006 |
| COX Investments Limited | Real estate | 2017 |
| CP Building & Roofing Services Ltd | Construction | 2025 |
| Crackajacks Ltd | Hospitality | 2012 |
| Crackholt Developments Limited | Construction | 2003 |
| Craftwork Engineering & Supplies Ltd | Manufacturing | 2010 |
| Craftwork Property Development Ltd | Construction | 2024 |
| Craven Farms Holdings Ltd | Agriculture & fishing | 2022 |
| Crbs Electrical Services Ltd | Construction | 2022 |
| Creedon Electrical Ltd | Construction | 2015 |
| Criminal Defence Associates Limited | Professional & scientific | 2014 |
| Cristian (Lincs) Ltd | Transport & logistics | 2018 |
| Crocus Techworks Limited | Professional & scientific | 2022 |
| Cromwell Commercials Limited | Professional & scientific | 2024 |
| Cropley Bros.Tours(Fosdyke)Limited | Transport & logistics | 1961 |
| Crossgate Farms Limited | Agriculture & fishing | 2008 |
| Crowland & Wolf Assets Ltd | Real estate | 2024 |
| Crown&Pizzagrill Limited | Hospitality | 2025 |
| Croyland Court Limited | Households | 1985 |
| Crozier Consultancy Ltd | Professional & scientific | 2023 |
| Cruzader Lincs Limited | Wholesale & retail | 2012 |
| CS6 Limited | Health & social care | 2021 |
| CSC Lettings Ltd | Real estate | 2016 |
| CSF Demolition Limited | Construction | 2007 |
| CSM Consultancies Ltd | Real estate | 2008 |
| CT Caravan Repairs Ltd | Manufacturing | 2021 |
| CTA Rentals Ltd | Real estate | 2026 |
| Cubcart Limited | Wholesale & retail | 2025 |
| Cubic Property Rentals Ltd | Real estate | 2021 |
| Culturvator CIC | Education | 2024 |
| CUP of Rosie Community Cafe CIC | Health & social care | 2026 |
| Curry Capital 2 Ltd | Real estate | 2025 |
| Curtains Direct Limited | Extraterritorial | 1995 |
| Custom Made Insoles Ltd | Wholesale & retail | 2019 |
| Customized Neon UK Ltd | Manufacturing | 2021 |
| CV Electrical Limited | Construction | 2014 |
| CV Nirushika Limited | Hospitality | 2023 |
| CVE Military Sales Limited | Wholesale & retail | 2011 |
| Cyncross Medical Limited | Health & social care | 2024 |
| D & B Tempo for Staffing Ltd | Administrative & support | 2026 |
| D a Limb Fire & Safety Consultancy Limited | Professional & scientific | 2024 |
| D and B (Boston) Limited | Wholesale & retail | 2025 |
| D Burrell Enterprises Limited | Households | 2012 |
| D Choma Ltd | Real estate | 2025 |
| D D Dodd & SON Ltd | Wholesale & retail | 2018 |
| D D Landscapes Ltd | Administrative & support | 2013 |
| D E Accounting & Payroll Services Ltd | Professional & scientific | 2019 |
| D G Farming Co Limited | Agriculture & fishing | 2009 |
| D H Crouch Marine Ltd | Construction | 2020 |
| D J G Building & Plumbing Ltd | Construction | 2023 |
| D R Carter Ltd | Transport & logistics | 2003 |
| D Signs, Graphics & Design Ltd | Professional & scientific | 2018 |
| D&D Motors RENT2BUY Ltd | Wholesale & retail | 2025 |
| D&D Transcontinental Ltd | Wholesale & retail | 2013 |
| D&F Limited | Wholesale & retail | 2017 |
| D&F Properties Lincolnshire Ltd | Real estate | 2022 |
| D. & R. Bugg Limited | Construction | 2010 |
| D13 Car Body Repairs Limited | Wholesale & retail | 2017 |
| D365 Resource Ltd | Information & communication | 2024 |
| D40 Construction Ltd | Construction | 2025 |
| DA Presi Ltd | Hospitality | 2024 |
| DA Security Limited | Administrative & support | 2019 |
| Dabyzahn Limited | Health & social care | 2025 |
| DAC & LM Services Ltd | Construction | 2016 |
| Dacscompany Ltd | Hospitality | 2025 |
| Daffodil Day Nurseries Limited | Health & social care | 2001 |
| Daisy Dale Properties Ltd | Real estate | 2017 |
| Dales Bakery Limited | Manufacturing | 2011 |
| Dales Sports Surfaces Limited | Construction | 1997 |
| Dani Foods Limited | Manufacturing | 2001 |
| Danielus Ltd | Transport & logistics | 2016 |
| Danny Transport Ltd | Transport & logistics | 2016 |
| Dany DE Vuia Limited | Transport & logistics | 2026 |
| Daran Medicare Limited | Health & social care | 2025 |
| Dario-Pol Limited | Administrative & support | 2015 |
| Darley Homes and Developments Limited | Construction | 2025 |
| Darz Property Ltd | Real estate | 2025 |
| Daserviceslincsprop Limited | Households | 2025 |
| Data Librarian Limited | Information & communication | 2025 |
| David & Lucas Construction Ltd | Construction | 2019 |
| David Ashton Limited | Agriculture & fishing | 1999 |
| David Cole Windscreens Limited | Wholesale & retail | 2013 |
| David COX Limited | Construction | 1961 |
| David Mangion Consultancy Limited | Health & social care | 2010 |
| David V Trans Limited | Transport & logistics | 2015 |
| Davidonis Limited | Transport & logistics | 2018 |