| COE Consulting Services Limited | Professional & scientific | 2016 |
| Colin Garnett Building Limited | Construction | 2017 |
| Collins Brook Court Management Company Limited | Households | 2010 |
| Communication and Learning Enterprises Limited | Education | 2008 |
| Community Solutions Ulverston CIC | Administrative & support | 2024 |
| Community Sports Arenas C.I.C. | Arts & recreation | 2022 |
| Coniston Keys Ltd | Real estate | 2021 |
| Conker IT Ltd | Extraterritorial | 2023 |
| Contour Building (CS) Limited | Construction | 2018 |
| Contract Plumbing Ltd | Construction | 2026 |
| Coopers Diamonds Limited | Energy | 2023 |
| Core Cuisine Ltd | Hospitality | 2025 |
| Core Exterior Clean and Restoration Ltd | Administrative & support | 2025 |
| Corrie and Co Ltd | Real estate | 2010 |
| Countrywide Roller Shutters Limited | Construction | 2016 |
| County (D&B) Ltd | Construction | 1978 |
| Cowley Yacht Metrology Ltd | Professional & scientific | 2018 |
| Cowran Care Ltd | Agriculture & fishing | 2010 |
| Cowran Estate Services Limited | Construction | 2021 |
| Cowran Group Limited | Financial services | 2023 |
| Cowran Training Limited | Agriculture & fishing | 2008 |
| Crake Valley Dairies Ltd | Agriculture & fishing | 2002 |
| Crakeside Meat Company Limited | Manufacturing | 2011 |
| Creating a Business Limited | Professional & scientific | 2022 |
| Crewdsons Plumbing Limited | Construction | 2021 |
| Crooked House Ulverston Limited | Wholesale & retail | 2022 |
| Cross Lane Court Limited | Real estate | 2006 |
| Crosse Limited | Construction | 2019 |
| Crow Tree Holdings Ltd | Financial services | 2026 |
| Crown Hill Management Company Limited | Households | 1989 |
| Crumble Crume Limited | Wholesale & retail | 2019 |
| Cryopod Limited | Administrative & support | 2013 |
| CTA Property Holdings Limited | Real estate | 2021 |
| Cumbria Combat Sports Limited | Arts & recreation | 2022 |
| Cumbria Concept Construction Ltd | Construction | 2025 |
| Cumbria County Cricket Club Limited | Arts & recreation | 2020 |
| Cumbria Hot TUB Hire Limited | Administrative & support | 2012 |
| Cumbria Personal Development Associates Ltd | Education | 2003 |
| Cumbria Rural Academy CIC | Education | 2009 |
| Cumbria Spray Renders Limited | Construction | 2019 |
| Cumbria Teaching & Care Limited | Extraterritorial | 2015 |
| Cumbria Teaching Agency Limited | Education | 2015 |
| Cumbria Teaching Group Limited | Professional & scientific | 2019 |
| Cumbria Timber Frame and Joinery Limited | Construction | 2015 |
| Cumbria Tradeframes Limited | Construction | 2002 |
| Cumbria Tyres Limited | Wholesale & retail | 2002 |
| Cumbria Woodburners Ltd | Construction | 2026 |
| Cumbrian Plates Ltd | Manufacturing | 2020 |
| Cumbricar Ltd | Wholesale & retail | 2025 |
| Custodian Cabin Limited | Hospitality | 2020 |
| Cutting Edge (Dalton) Ltd | Other services | 2012 |
| Cutting Edge (Hair OIL) Company Limited | Manufacturing | 2026 |
| Cyber Lead Limited | Information & communication | 2023 |
| Cyncle Digital Ltd | Information & communication | 2026 |
| D & J Wilkinson Ltd | Transport & logistics | 2006 |
| D a Clough Limited | Professional & scientific | 2023 |
| D F Irving Limited | Transport & logistics | 2002 |
| D S Wood Limited | Professional & scientific | 2017 |
| D Sharp Limited | Construction | 2010 |
| D Wood Developments Limited | Construction | 2012 |
| D.Merkouriadis Ltd | Health & social care | 2026 |
| DA Campbell Technical Services Limited | Professional & scientific | 2015 |
| DA Vinci Italia Limited | Hospitality | 2005 |
| Dalton 4X4 Offroad Limited | Other services | 2022 |
| DAM Construction Management Limited | Professional & scientific | 2011 |
| Dandahair Limited | Other services | 2017 |
| Daniel Viney Ltd | Professional & scientific | 2020 |
| Danny Barlow Construction Ltd | Construction | 2023 |
| Darine Limited | Administrative & support | 2002 |
| Datum Legal Limited | Professional & scientific | 2023 |
| Daughter by JC Ltd | Wholesale & retail | 2019 |
| Davenport One Ltd | Construction | 2020 |
| David Bottomley Properties Limited | Real estate | 1991 |
| David Postlethwaite Limited | Other services | 2005 |
| Davis & Hadwin Limited | Construction | 1993 |
| DB Svcs Limited | Professional & scientific | 2021 |
| DC Cycles Ltd | Real estate | 2009 |
| Dcjp Ltd | Construction | 2017 |
| DE Fuentes Properties Limited | Households | 2023 |
| Dearlove Investments Limited | Financial services | 2025 |
| Deathstar Tattoos Limited | Other services | 2014 |
| Decision-Subsurface Limited | Professional & scientific | 2022 |
| Derya Food Ltd | Hospitality | 2025 |
| Design and CGI Ltd | Professional & scientific | 2025 |
| Development Consultancy (Nationwide) Limited | Professional & scientific | 2024 |
| Devine Fitness Limited | Health & social care | 2015 |
| Devonshire Arms (Ulverston) Limited | Hospitality | 2008 |
| Devonshire Services Limited | Wholesale & retail | 2001 |
| DG Building Services Ltd | Construction | 2021 |
| DGR Operations Limited | Professional & scientific | 2015 |
| Diamond Cooper Limited | Energy | 2025 |
| Diamond Windows & Doors Limited | Construction | 2007 |
| Digital Woodoo CIC | Manufacturing | 2020 |
| Dissentral Ltd | Information & communication | 2025 |
| Divine Darlings Ltd | Health & social care | 2025 |
| DJ Fabs Limited | Professional & scientific | 2021 |
| DM Contractors (North West) Limited | Mining & quarrying | 2023 |
| DMI Boxes UK Ltd | Manufacturing | 2022 |
| Dodgson Wood Ltd | Agriculture & fishing | 2025 |
| Domain Dominion Limited | Information & communication | 2016 |