| CMB Construction Maintenance & Building Limited | Construction | 2015 |
| CMF Compacts Ltd | Agriculture & fishing | 2026 |
| Cmlc Ltd | Construction | 2016 |
| Cmoka JKB Ltd | Transport & logistics | 2026 |
| CMT Lincoln Ltd | Other services | 2010 |
| CN Pizza Ltd | Hospitality | 2019 |
| Cncn Limited | Hospitality | 2018 |
| CNR Electrical Services Ltd | Construction | 2025 |
| Co Estates Ltd | Real estate | 2024 |
| Co-Dreaming Group Ltd | Information & communication | 2024 |
| Coach Transport Solutions Limited | Transport & logistics | 2012 |
| Coaching Communities CIC | Professional & scientific | 2020 |
| Coar Contractors Limited | Information & communication | 2015 |
| Coats and Hoes Limited | Extraterritorial | 2021 |
| COB Haulage Ltd | Transport & logistics | 2025 |
| Cobalt Human Solutions Ltd | Professional & scientific | 2020 |
| Cobb & Co Property Limited | Real estate | 2021 |
| Cobble Accountants Limited | Professional & scientific | 2023 |
| Cobble Audit Limited | Professional & scientific | 2025 |
| Cobble Limited | Professional & scientific | 2025 |
| Cobblecrete Building Limited | Construction | 2017 |
| Cobra Physio Services Ltd | Health & social care | 2019 |
| Cocaine Limited | Manufacturing | 2003 |
| Cockadoodledoo Communications Ltd | Professional & scientific | 2020 |
| Coco Services Limited | Health & social care | 2026 |
| Cocos Spice Limited | Hospitality | 2026 |
| Codal Ltd | Professional & scientific | 2019 |
| Code Cats Ltd | Information & communication | 2023 |
| Codebreaker Brew Co. Ltd | Manufacturing | 2015 |
| Codebreaker Brewery Ltd | Other services | 2022 |
| Codename Consulting Limited | Professional & scientific | 2015 |
| Coffee Cats Lincoln Limited | Hospitality | 2019 |
| Coffee Culture Lincoln Limited | Hospitality | 2023 |
| Coffee Depot Ltd | Real estate | 2018 |
| Cogentis Ltd | Professional & scientific | 2025 |
| Cognetrix Limited | Professional & scientific | 2023 |
| Cognotion Ltd | Information & communication | 2025 |
| Cola Property Ltd | Real estate | 2023 |
| Colab Services Limited | Professional & scientific | 2019 |
| Colaco DOC Limited | Health & social care | 2016 |
| Cold Hanworth Developments Limited | Administrative & support | 2023 |
| Coldstead Lettings Ltd | Real estate | 2025 |
| Cole & Cole Properties Ltd | Construction | 2014 |
| Cole's Lettings Lincoln Ltd | Real estate | 2021 |
| Coleby Hall Management Company Limited | Real estate | 2001 |
| Coleby PUB Company (Investments) Limited | Real estate | 2015 |
| Coleby Technical Writing Ltd | Professional & scientific | 2024 |
| Coleman Interiors Ltd | Construction | 2021 |
| Coleman Spedition Ltd | Transport & logistics | 2023 |
| Colin Baggaley Limited | Construction | 2015 |
| Colin Rogers Driving Services Ltd | Transport & logistics | 2014 |
| Collaborative Psychology Services Limited | Health & social care | 2019 |
| Collaroy Consulting Ltd | Professional & scientific | 2012 |
| Colley Transport Ltd | Transport & logistics | 2025 |
| Colliander & Partners Ltd | Professional & scientific | 2013 |
| Collingham FC 2020 Ltd | Arts & recreation | 2020 |
| Colney Health Ltd | Health & social care | 2019 |
| Colonia Garden Rooms and Developments Ltd | Construction | 2022 |
| Colonia Ltd | Real estate | 2020 |
| Colorectal Specialists Ltd | Health & social care | 2015 |
| Colposcopy UK Limited | Extraterritorial | 2005 |
| Com-Tel Telecom Ltd | Information & communication | 2014 |
| Comair Limited | Information & communication | 1998 |
| Comdh Ltd | Information & communication | 2016 |
| Comic Culture Ltd | Administrative & support | 2012 |
| Commerce Circle Ltd | Information & communication | 2018 |
| Commerce Tuned Limited | Information & communication | 2003 |
| Commercial Catering Equipment Specialists Ltd | Wholesale & retail | 2019 |
| Commercial Measured Surveys Ltd | Professional & scientific | 2010 |
| Commerion Ltd | Wholesale & retail | 2026 |
| Common-Sense Consulting Limited | Professional & scientific | 2015 |
| Commonsenseco Ltd | Wholesale & retail | 2019 |
| Community Assets Plus | Real estate | 2012 |
| Community Help Offering Meals and Provisions (C.H.O.M.P.) C.I.C. | Other services | 2025 |
| Community Properties Ltd | Real estate | 2017 |
| Community Supermarkets Limited | Wholesale & retail | 2010 |
| Commuter Jazz Ltd | Arts & recreation | 2024 |
| Como Property Group Ltd | Real estate | 2025 |
| Companion Animal Consulting Ltd | Professional & scientific | 2025 |
| Complete Care Dental Clinic Limited | Health & social care | 2008 |
| Complete Care Solutions Limited | Health & social care | 2017 |
| Complete-Careers LLP | | 2015 |
| Compliance Assist Transport Services Limited | Transport & logistics | 2019 |
| Complisure Services Ltd | Professional & scientific | 2013 |
| Complylet Pro Limited | Information & communication | 2026 |
| Composites Evolution Limited | Manufacturing | 2009 |
| Comprehensive Fire and Security Solutions Limited | Administrative & support | 2017 |
| Comprehensive Pest Control Limited | Real estate | 2020 |
| Compton's Clinic Ltd | Wholesale & retail | 2024 |
| Compton's Consultancy Ltd | Professional & scientific | 2023 |
| Computade Limited | Information & communication | 1989 |
| Computer WIZ Lincoln Ltd | Other services | 2022 |
| Comsoc Bars Limited | Hospitality | 2025 |
| Concept 9 Developments Limited | Construction | 2005 |
| Concept Drawing Limited | Professional & scientific | 2005 |
| Concert Recording and Broadcast Ltd | Information & communication | 2014 |
| Concessions Catering Limited | Hospitality | 2014 |
| Concise Financial Solutions Limited | Professional & scientific | 2014 |
| Concise Homes Limited | Real estate | 2017 |
| CONGREG8 Limited | Extraterritorial | 2020 |