| CR Fitness Limited | Arts & recreation | 2023 |
| Craft-Lincoln Limited | Hospitality | 2017 |
| Crafting at Home Limited | Administrative & support | 2026 |
| Craftyladuk Ltd | Manufacturing | 2021 |
| Cragg Electrical Services Limited | Construction | 2010 |
| Craig Barton FT Ltd | Health & social care | 2009 |
| Craig Barton Health Ltd | Arts & recreation | 2021 |
| Craig Easton Ltd | Professional & scientific | 2021 |
| Craig Harris Consulting Ltd | Professional & scientific | 2020 |
| Craig Marshall Ltd | Construction | 2009 |
| Crane Hire Limited | Transport & logistics | 2016 |
| Craneaudit Ltd | Professional & scientific | 2021 |
| Crankshaft and Site Machining Services Limited | Manufacturing | 2012 |
| CRC Consulting Ltd | Information & communication | 2020 |
| Creane Construction Limited | Construction | 2021 |
| Creasey Crushing-Screening Ltd | Mining & quarrying | 2018 |
| Creasey Haulage Ltd | Transport & logistics | 2023 |
| Creations 4 YOU Limitless Ltd | Wholesale & retail | 2023 |
| Creative Grass Ltd | Wholesale & retail | 2021 |
| Creative Otter Limited | Construction | 2026 |
| Creative Rebel CIC | Administrative & support | 2017 |
| Creative Resource Solutions Limited | Administrative & support | 2006 |
| Creative Resourcing Ltd | Administrative & support | 2021 |
| Creative Resourcing Solutions Ltd | Administrative & support | 2015 |
| Creativity & More Ltd | Information & communication | 2026 |
| Creativity, Design and Production Ltd | Manufacturing | 2026 |
| Cresco Capital (London) Limited | Administrative & support | 2006 |
| Cressida Holdings Limited | Financial services | 2022 |
| Crest Virtual Academy Ltd | Education | 2025 |
| Crew Lincoln Limited | Other services | 2012 |
| Cricketers View Management Company Limited | Households | 2023 |
| Cricketers Walk Management Company Ltd | Households | 2025 |
| Cricklewood Property Ltd | Real estate | 2023 |
| Crinsey Limited | Wholesale & retail | 2011 |
| Crisalida HR Solutions Ltd | Professional & scientific | 2025 |
| CRL Technology Consulting Limited | Professional & scientific | 2026 |
| Croft Carpets, Curtains & Blinds Limited | Wholesale & retail | 2015 |
| Croft Contract Flooring Limited | Construction | 2019 |
| Crofton Business Centre Limited | Real estate | 2025 |
| Crofton Construction Limited | Construction | 2003 |
| Cromore Ltd | Professional & scientific | 2012 |
| Crompton House Ltd | Professional & scientific | 2026 |
| Crop Intellect Ltd | Manufacturing | 2011 |
| Crops for Products Limited | Agriculture & fishing | 2025 |
| Cross Carpentry & Joinery Ltd | Construction | 2024 |
| Crossbench Consulting Ltd | Information & communication | 2006 |
| Crossings Motorhome Tours Ltd | Administrative & support | 2013 |
| Crossjoint Developments Limited | Construction | 2012 |
| Crown Mill (1993) Management Limited | Households | 1993 |
| Crown Tackle Ltd | Wholesale & retail | 2026 |
| Crown Wealth Properties Ltd | Real estate | 2026 |
| Crown&Collar Ltd | Wholesale & retail | 2024 |
| Crownedge Facilities Ltd | Information & communication | 2026 |
| Crownlea Limited | Construction | 1998 |
| Crowns & Castle Limited | Education | 2025 |
| Crows Nest (Lincoln) Limited | Hospitality | 2016 |
| Crowther Solutions Ltd | Professional & scientific | 2019 |
| CRS Services (UK) Ltd | Water & waste | 2014 |
| Cruckton Hall Limited | Education | 2009 |
| Cruden Group Fsps Holdings Ltd | Professional & scientific | 2017 |
| Crumlin Driver Hire Ltd | Transport & logistics | 2024 |
| Crusader House & George Street Trading House RTM Company Limited | Households | 2010 |
| Crust & Cask Ltd | Hospitality | 2024 |
| CRV Lighting & Controls Ltd | Professional & scientific | 2025 |
| Cryo VAC Engineering Limited | Professional & scientific | 2014 |
| Crystal Cat Limited | Other services | 2024 |
| CS Engineering Solutions Ltd | Professional & scientific | 2025 |
| CS Lincoln Ltd | Wholesale & retail | 2024 |
| CS Robinson Limited | Real estate | 1999 |
| CSG Property Ltd | Construction | 2011 |
| Cshdhc Limited | Wholesale & retail | 2025 |
| Csnr Technologies Ltd | Professional & scientific | 2017 |
| CST Accountancy Services Ltd | Professional & scientific | 2014 |
| CTH PMO Consulting Limited | Information & communication | 2026 |
| Ctpmethod Ltd | Education | 2025 |
| Ctruk Ltd | Wholesale & retail | 2021 |
| Cube Mechanical Limited | Wholesale & retail | 2018 |
| Cubed Media Ltd | Professional & scientific | 2019 |
| Culverwell Wrought Iron Ltd | Manufacturing | 2006 |
| Curbside Kravings Ltd | Hospitality | 2024 |
| Curiosity Global Education Ltd | Education | 2014 |
| Curious CAP Company Ltd | Wholesale & retail | 2024 |
| Curious Sport Ltd | Wholesale & retail | 2023 |
| Curly Moon Nanny Ltd | Health & social care | 2020 |
| Curo Social Enterprise CIC | Agriculture & fishing | 2022 |
| Curry Club Lincolnshire Limited | Hospitality | 2023 |
| Curry Jacks Limited | Manufacturing | 2017 |
| Cursor Limited | Professional & scientific | 2007 |
| Curtis Consultants Ltd | Health & social care | 2024 |
| Curtis of Lincoln Limited | Manufacturing | 2012 |
| Curtis Property Company Ltd | Real estate | 2018 |
| Custom Paving & Co Ltd | Construction | 2024 |
| Custos Developments Ltd | Real estate | 2026 |
| Cuthbert Consultants Limited | Professional & scientific | 2017 |
| Cuthberts Yard Management Company Limited | Real estate | 2012 |
| CUTS1 Limited | Other services | 2025 |
| Cutts Design & Build Limited | Construction | 2021 |
| CV and Coaching Ltd | Professional & scientific | 2024 |
| CVC (Lincs) Limited | Other services | 2007 |
| CVE H&J Limited | Hospitality | 2025 |