| 1 Black Dog Design Limited | Construction | 2017 |
| 7 Star Hair Masters Limited | Other services | 2023 |
| 95MAINSTREET Ltd | Hospitality | 2024 |
| A & M Storage Ltd | Transport & logistics | 2017 |
| A a Electrical Contractors (Solway) Limited | Construction | 2011 |
| A J-Cass CIC | Public administration | 2024 |
| A M Jones Carpentry Ltd | Manufacturing | 2024 |
| A T Projects Cumbria Limited | Construction | 2013 |
| A&M Driver Services Ltd | Transport & logistics | 2018 |
| AJ Training Academy Limited | Education | 2020 |
| Aj-Security (North) Ltd | Administrative & support | 2021 |
| AJJ Property Management Ltd | Real estate | 2025 |
| AJW Rentals Ltd | Real estate | 2026 |
| Alauna Boiler Compliance Ltd. | Construction | 2015 |
| AMT Electrical Cumbria Ltd | Construction | 2020 |
| Annabel Ward Therapy Ltd | Health & social care | 2026 |
| Applederk Properties Limited | Real estate | 2021 |
| Armstrong Todd Ltd | Wholesale & retail | 2022 |
| Atish Ltd | Hospitality | 2026 |
| Aurora Marine Engineering Ltd | Professional & scientific | 2021 |
| AVS Cumbria Metals Limited | Water & waste | 2002 |
| AVS Storage Solutions Limited | Water & waste | 2016 |
| B&K Polish Shop Ltd | Wholesale & retail | 2022 |
| Bailiff Properties Ltd | Real estate | 2020 |
| Barbora's Kitchen Limited | Hospitality | 2024 |
| Barnett's(Buglawton)Limited | Manufacturing | 1931 |
| Beardsell & Sons Limited | Other services | 2018 |
| Bels Consultancy Ltd | Professional & scientific | 2012 |
| Better Bodies UK - Employment and Corporate Training Solutions Ltd | Other services | 2019 |
| Bionovu Ltd | Wholesale & retail | 2025 |
| Bitefulldearham Ltd | Hospitality | 2026 |
| Black & White Safety Ltd | Professional & scientific | 2025 |
| Blackwood Airey Holdings Ltd | Real estate | 2025 |
| Blue Dial Caravans Limited | Hospitality | 2002 |
| Blue Flame Properties (Cumbria) Ltd | Real estate | 2016 |
| Blue Flame Services Limited | Construction | 2003 |
| Blue Sky Components Limited | Wholesale & retail | 2014 |
| Blue World Paragliding Ltd | Transport & logistics | 2021 |
| Boston NDT Ltd | Professional & scientific | 2024 |
| Brandt Enterprises Ltd | Extraterritorial | 2018 |
| Brickworks Garage Limited | Wholesale & retail | 2009 |
| Brimstone Marketing Ltd | Professional & scientific | 2025 |
| Brookson (5132R) Limited | Professional & scientific | 2007 |
| Brough AG Ltd | Manufacturing | 2020 |
| C & C Developments Cumbria Limited | Construction | 2013 |
| C & C Painting & Decorating Limited | Construction | 2006 |
| C & N Plastering Ltd | Construction | 2008 |
| C & S Roofing Limited | | 1982 |
| C D Coatings Cumbria Limited | Wholesale & retail | 2016 |
| C Morgan HGV and Plant Operating Limited | Transport & logistics | 2013 |
| Cafe TAJ Wigton Deli Limited | Hospitality | 2023 |
| Calf Lonning Caravan Park Ltd | Hospitality | 2021 |
| Cannondale Construction Limited | Construction | 2002 |
| Canny Care Ltd | Public administration | 2026 |
| Captain Nelson Tavern Ltd | Hospitality | 2025 |
| Carlisle Homebuyers Ltd | Real estate | 2018 |
| Cartwright Cumbria Ltd | Information & communication | 2008 |
| CH Process Cumbria Limited | Real estate | 2023 |
| Chambers & Harrison Limited | Construction | 2014 |
| Chapel Meadows (Bothel) Management Company Limited | Households | 2024 |
| Cheer Force Knights Maryport Limited | Arts & recreation | 2023 |
| Clean-N-Green Ltd | Real estate | 2022 |
| CM Cabs Cumbria Limited | Transport & logistics | 2025 |
| Coffee & Craic Co. Ltd | Wholesale & retail | 2026 |
| Collier & Henry Concrete (Floors) Limited | Manufacturing | 1993 |
| Collier & Henry Concrete (Holdings) Limited | Real estate | 1999 |
| Collier & Henry Concrete Limited | Professional & scientific | 1983 |
| Contactless Check Solutions Ltd | Professional & scientific | 2019 |
| Contract Fencing Limited | Construction | 2000 |
| Cooper & Patterson Ltd | Construction | 2003 |
| Cottage PIE Limited | Wholesale & retail | 2003 |
| Coulthards Concrete Products (1980) Limited | Manufacturing | 1980 |
| Courtier Construction Limited | Construction | 2017 |
| Covewalk Limited | Real estate | 1998 |
| Craika Close Management Company Limited | Households | 2019 |
| Crozier Construction Limited | Construction | 2012 |
| Cumbria Dampcourse Limited | Construction | 2004 |
| Cumbria Independent Mortgage Services Ltd | Financial services | 2006 |
| Cumbria Metals Ltd | Administrative & support | 2010 |
| Cumbria Technical Services Ltd | Construction | 2013 |
| Curiology Limited | Wholesale & retail | 2015 |
| Curzon Dental Limited | Health & social care | 2022 |
| Custom Clean Cumbria Ltd | Administrative & support | 2021 |
| D & B Barber Ltd | Other services | 2023 |
| D Martin Engineering Ltd | Professional & scientific | 2019 |
| Dales Care Homes Limited | Health & social care | 1994 |
| Dales Construction Services Limited | Construction | 2005 |
| Dallaware Ltd | Information & communication | 2016 |
| David Towers Plumbing & Heating Limited | Construction | 2009 |
| DD Structural Ltd | Professional & scientific | 2026 |
| Deleta Ltd | Transport & logistics | 2025 |
| Denimolite Ltd | Manufacturing | 2023 |
| Dinh DAO Limited | Other services | 2023 |
| DIY Property Limited | Real estate | 2018 |
| DJS Food and Wine Ltd | Wholesale & retail | 2020 |
| DN Auto Solutions Limited | Wholesale & retail | 2024 |
| Dominion International Ltd | Hospitality | 2025 |
| Duncan Hill Limited | Transport & logistics | 1984 |
| DXN Electrical Ltd | Construction | 2021 |
| Dyson ET Ltd | Hospitality | 2026 |