| Creative Coatings Limited | Other services | 2011 |
| Creative Minds Lincolnshire Ltd | Manufacturing | 2017 |
| Crescent (East) Ltd | Construction | 2025 |
| Crescent Lane Coffee Ltd | Wholesale & retail | 2023 |
| Criado Duro Limited | Wholesale & retail | 2025 |
| Crimson Accounting Limited | Professional & scientific | 2023 |
| Crimson Foods Limited | Professional & scientific | 2010 |
| Crisp & Crane Training Limited | Education | 2012 |
| Crisp and Crane Consultancy Limited | Professional & scientific | 2019 |
| Criss Garage Limited | Wholesale & retail | 2015 |
| Cristian Tene Ltd | Transport & logistics | 2018 |
| Cristitransport (Lincs) Ltd | Transport & logistics | 2024 |
| Criticare (London) Limited | Health & social care | 2011 |
| Croc Demolition Ltd | Construction | 2023 |
| Croc Fire Proofing Ltd | Construction | 2025 |
| Cross Bros (Properties) Limited | Real estate | 2012 |
| Cross Bros.(Long Sutton),Limited | Wholesale & retail | 1929 |
| Cross Keys Nursery Ltd | Agriculture & fishing | 2021 |
| Crosskeys Associates Limited | Manufacturing | 2011 |
| Crosskeys Engineering Ltd | Professional & scientific | 2017 |
| Crosskeys Estates Limited | Wholesale & retail | 2022 |
| Crosskeys Recreation Limited | Hospitality | 2011 |
| Crossplan Ltd | Information & communication | 2023 |
| Crossroads Nurseries Limited | Agriculture & fishing | 1995 |
| Crossway Hand Limited | Professional & scientific | 2024 |
| Crow & Uncle Ltd | Administrative & support | 2026 |
| Crowland Pallets 2009 Limited | Manufacturing | 2009 |
| Crown Pastries Limited | Manufacturing | 2023 |
| Crown Pathway Ltd | Arts & recreation | 2021 |
| Crucial Silicon Ltd. | Manufacturing | 2003 |
| Crystal Clean Windows Limited | Extraterritorial | 2019 |
| Crystal Services (Lincs) Ltd | Construction | 2018 |
| CS Drivers Logistics Limited | Transport & logistics | 2018 |
| CSA Prosperity Transport Ltd | Transport & logistics | 2025 |
| CSB Engineering Services Limited | Construction | 2002 |
| CSG Management Consultancy Ltd | Professional & scientific | 2019 |
| CSSERVICES23 Ltd | Transport & logistics | 2023 |
| Cssh Properties Limited | Real estate | 2026 |
| CT Leadworks Limited | Construction | 2016 |
| CTM Property Maintenance and Home Improvements Ltd | Construction | 2022 |
| Ctrland Sons Ltd | Transport & logistics | 2024 |
| CTZ (Boston) Limited | Real estate | 2023 |
| Culpin Solutions Limited | Extraterritorial | 2009 |
| Cura Facilities Solutions Limited | Administrative & support | 2024 |
| Curelaru Catalin Ltd | Administrative & support | 2017 |
| Curomed Limited | Professional & scientific | 2026 |
| Current Buns Ltd | Construction | 2017 |
| Curry Kingdom Tydd Gote Ltd | Hospitality | 2024 |
| Curtis Fields (Coningsby) Management Company Ltd | Households | 2017 |
| Curtis Install Ltd | Administrative & support | 2026 |
| Custom Colour Coatings Ltd | Construction | 2022 |
| Custom Design Kitchens & Bedrooms Ltd | Wholesale & retail | 2020 |
| Custom Phone Designs Ltd | Wholesale & retail | 2026 |
| Customer Service Education Limited | Education | 2021 |
| Cuta Tran Limited | Transport & logistics | 2015 |
| Cutters for Clay Ltd | Manufacturing | 2024 |
| CV Transport (Lincs) Ltd | Transport & logistics | 2017 |
| CVR Consulting Ltd | Professional & scientific | 2015 |
| CWB Landscaping & Driveways Ltd | Administrative & support | 2025 |
| Cwef Services Limited | Construction | 2018 |
| Cyclone Fitness Limited | Manufacturing | 2023 |
| D & M Tech Limited | Administrative & support | 2012 |
| D & R Homes (Gosberton) Limited | Construction | 2019 |
| D & R Homes (Swineshead) Limited | Construction | 2018 |
| D & R Property Services Limited | Construction | 2008 |
| D D & H Limited | Other services | 2008 |
| D Dawson Builders Ltd | Construction | 2016 |
| D F Property Maintenance Ltd | Transport & logistics | 2016 |
| D Groves Plumbing & Heating Ltd | Construction | 2018 |
| D J W Roofing and Leadwork Ltd | Construction | 2026 |
| D Steele Ltd | Agriculture & fishing | 2010 |
| D T Maltby Roofing & Building Ltd | Construction | 2019 |
| D Willson (Paving) Limited | Construction | 2012 |
| D&A Remueve Ltd | Transport & logistics | 2026 |
| D&A Trans Ltd | Transport & logistics | 2017 |
| D&R Home and Garden Maintenance Limited | Construction | 2023 |
| D&R Homes Limited | Professional & scientific | 2007 |
| D&S Fashion Ltd | Wholesale & retail | 2019 |
| D&T Autos Ltd | Wholesale & retail | 2020 |
| D'N'R Autos Limited | Wholesale & retail | 2016 |
| D-Locks Ltd | Manufacturing | 2023 |
| D-Moredevelopments Ltd | Construction | 2024 |
| D. Allen and SON, Butchers Limited | Agriculture & fishing | 1979 |
| D. Brown (Building Contractors) Limited | Construction | 1983 |
| D. Brown (Butterfly Park) Limited | Construction | 2023 |
| D. Stevens Building & Roofing Limited | Construction | 2013 |
| D.& R.Simmons,Limited | Agriculture & fishing | 1951 |
| D.A.S.H. Hand Car Wash Ltd | Wholesale & retail | 2024 |
| D.E. Brand & Sons (Holdings) Limited | Agriculture & fishing | 2015 |
| D.P. Packaging (Spalding) Limited | Hospitality | 1988 |
| D.R.S Fleet Maintenance Limited | Wholesale & retail | 2025 |
| D.S. Flooring Spalding Ltd | Construction | 2018 |
| D.T Building and Landscaping Ltd | Administrative & support | 2026 |
| D.W. Woods Landscaping Limited | Administrative & support | 2006 |
| DA Engineering (UK) Limited | Administrative & support | 2006 |
| DAB & Sons (Engineering) Ltd | Manufacturing | 2026 |
| DAB Drive Ltd | Transport & logistics | 2021 |
| Dacia Bytes Limited | Manufacturing | 2022 |
| Dacu Nordic Ltd | Transport & logistics | 2025 |
| Dacy Heating Services Ltd | Construction | 2010 |