| Busy Bees Bourne Ltd | Health & social care | 2012 |
| Buy & BYE Ltd | Wholesale & retail | 2024 |
| Buzz Courier Ltd | Transport & logistics | 2010 |
| Byzantine Limited | Information & communication | 2003 |
| C & J Supplies Limited | Wholesale & retail | 2003 |
| C a Riley & SON Ltd | Construction | 2010 |
| C&Ozkan Limited | Administrative & support | 2019 |
| C&S Construction (Bourne) Limited | Construction | 2019 |
| Cadspex Limited | Information & communication | 2007 |
| Calibre RF & Microwave Consultancy Ltd | Administrative & support | 2016 |
| Callow Esse Limited | Wholesale & retail | 2007 |
| Camamile & I Ltd | Wholesale & retail | 2022 |
| Candg Lettings Ltd | Real estate | 2021 |
| Capper Investments Limited | Financial services | 2021 |
| Cara Howard Consulting Ltd | Information & communication | 2026 |
| Carlos Pizza Ltd | Hospitality | 2025 |
| Carrock Consultants Ltd | Information & communication | 2022 |
| Cartunes Limited | Wholesale & retail | 2007 |
| Carvex Property Limited | Real estate | 2026 |
| Castle Estates (2020) Limited | Construction | 2020 |
| Castlebuild Scaffolding Limited | Administrative & support | 2002 |
| CCS Agri Ltd | Agriculture & fishing | 2022 |
| CG Engineering Management Services Limited | Professional & scientific | 2022 |
| CG New Build Snagging Ltd | Construction | 2021 |
| Chalt Ltd | Wholesale & retail | 2021 |
| Charles and Darcy Property Ltd | Real estate | 2024 |
| Chatterton & Cooke, Limited | Agriculture & fishing | 1943 |
| Cherry Holt Garden Centre Limited | Wholesale & retail | 1986 |
| Cheryl MAE Robinson Ltd | Health & social care | 2016 |
| Chillbox Rental Limited | Extraterritorial | 2011 |
| China Hand (Lincs) Ltd | Hospitality | 2018 |
| Church View Freehold Limited | Real estate | 2013 |
| Circlebox Creative Limited | Information & communication | 2013 |
| Circularity Direct Ltd | Administrative & support | 2024 |
| CLA Contracting Ltd | Construction | 2016 |
| Clark Catering Ltd | Hospitality | 2022 |
| Clay Cross Land Limited | Water & waste | 2006 |
| Cleancare (Lincolnshire) Limited | Administrative & support | 2009 |
| Cleancare Domestic Limited | Administrative & support | 2018 |
| Clear Accountancy Limited | Professional & scientific | 2015 |
| Clear Networks UK Ltd | Information & communication | 2006 |
| Clearpix Limited | Health & social care | 2022 |
| Clifford Wood Marketing Limited | Wholesale & retail | 2008 |
| Cloudcraft Limited | Information & communication | 2021 |
| Clover Plumbing and Heating Limited | Construction | 2014 |
| CNC Repair (UK) Limited | Professional & scientific | 2011 |
| Codeci Development Limited | Construction | 2020 |
| Colab 44 Ltd | Professional & scientific | 2026 |
| Combi-Fix Solutions Limited | Manufacturing | 2013 |
| Comfy Property (UK) Limited | Real estate | 2015 |
| Commercial & Surveying Solutions Limited | Professional & scientific | 2004 |
| Commercial Kitchen Cleaning Ltd | Manufacturing | 2015 |
| Community Champions Ltd | Other services | 2018 |
| Compass Building Contractors Ltd | Construction | 2025 |
| Compass Risk Management Limited | Professional & scientific | 2010 |
| Compass Risk Management Services Ltd | Professional & scientific | 2011 |
| Complianceology Limited | Professional & scientific | 2018 |
| Compton Redevelopments Limited | Real estate | 2026 |
| Concept 2 Design Limited | Manufacturing | 2010 |
| Conservatory Transformations Limited | Construction | 2013 |
| Constructed Pathways CIC | Education | 2024 |
| Constructed Pathways Training Partners Ltd | Professional & scientific | 2025 |
| Construction & Renovation Limited | Construction | 2002 |
| Consumerview Group Limited | Professional & scientific | 2004 |
| Consumerview Horticulture Ltd | Professional & scientific | 2002 |
| Consumerview Limited | Professional & scientific | 2003 |
| Contagious Ambition Ltd | Information & communication | 2019 |
| Convexa Ltd | Transport & logistics | 2025 |
| Cooke 2026 Limited | Professional & scientific | 2026 |
| Cooke Holdings 2026 Limited | Professional & scientific | 2026 |
| Coppice Consultants Ltd | Professional & scientific | 2010 |
| Corr Leisure Limited | Arts & recreation | 2020 |
| Cortek Ltd | Professional & scientific | 2026 |
| Cotswold Venture Group Limited | Administrative & support | 2019 |
| Coulson Roofing Limited | Construction | 2022 |
| Country Traditionals (2009) Ltd | Wholesale & retail | 2009 |
| Countrywide Office & Shopfitting Limited | Construction | 2014 |
| Covco Limited | Real estate | 2003 |
| Covrswap Ltd | Wholesale & retail | 2025 |
| Cowling Electrical Services Ltd | Construction | 2018 |
| Crane & SON Ltd | Wholesale & retail | 2023 |
| Crane Energy Assets Limited | Information & communication | 2025 |
| CRES100 Limited | Information & communication | 2011 |
| Cresslands Limited | Transport & logistics | 2013 |
| Crosshire Assist Ltd | Extraterritorial | 2020 |
| Crownfield Motors Limited | Wholesale & retail | 2022 |
| Crumbs a Cake Company Ltd | Manufacturing | 2025 |
| CT Engineering (Agricultural) Limited | Manufacturing | 2014 |
| Curious Kinetics Ltd | Professional & scientific | 2025 |
| Customer Returns Limited | Wholesale & retail | 2024 |
| CUT Twotwo Media Ltd | Information & communication | 2022 |
| CWI Technical Ltd | Professional & scientific | 2003 |
| Cwtch Property Rentals Ltd | Real estate | 2024 |
| D a Riley & SON Ltd. | Agriculture & fishing | 2016 |
| D S Landscapes Limited | Administrative & support | 2015 |
| D'Ethics Limited | Professional & scientific | 2021 |
| D.A. Lees & Daughters Limited | Arts & recreation | 2020 |
| D.P. Education Limited | Education | 2006 |
| Dala Hospitality Ltd | Hospitality | 2025 |
| DAN Bancroft Ltd | Information & communication | 2024 |