| Bear Electrical Engineering Limited | Professional & scientific | 2016 |
| Beau's Specialist Flooring Ltd | Construction | 2025 |
| Beckside Bungalow Construction Limited | Construction | 2023 |
| Beer Express Limited | Wholesale & retail | 1998 |
| Bella Vita Cumbria Limited | Other services | 2018 |
| Belmonte Homes Limited | Construction | 2021 |
| BEN G Construction Limited | Construction | 2023 |
| Bentech Engineering Ltd | Professional & scientific | 2024 |
| Berry Elite Decorators Limited | Construction | 2024 |
| Bethcar Limited | Hospitality | 2025 |
| Better Hearing Limited | Wholesale & retail | 2016 |
| Beyond the Optics Ltd | Information & communication | 2026 |
| Bezuszko Limited | Wholesale & retail | 2014 |
| BH Interiors Limited | Wholesale & retail | 2023 |
| Biggar Epms Limited | Professional & scientific | 2021 |
| Biggar Properties Limited | Real estate | 2020 |
| Bill Anyon Upvc Cumbria Limited | Construction | 2025 |
| Bill Anyon Upvc Limited | Construction | 2018 |
| Bitwax Ltd | Information & communication | 2019 |
| Black Hand Wine Limited | Administrative & support | 2016 |
| Blackbird Capital Ventures Limited | Professional & scientific | 2023 |
| Blembler & Arpviks Group Limited | Manufacturing | 2022 |
| Bluebell House Consultants LLP | | 2006 |
| Blush (Whitehaven) Limited | Wholesale & retail | 2012 |
| BM Roofing Whitehaven Ltd | Construction | 2023 |
| Bodyfit (SAM Ayers) Ltd | Health & social care | 2011 |
| Border Energy Ltd | Manufacturing | 2011 |
| Border Hydro Limited | Manufacturing | 2011 |
| Border Renewables Ltd | Construction | 2024 |
| Boris B Mechanical Services Limited | Administrative & support | 2007 |
| BOS Associates Limited | Professional & scientific | 2012 |
| Bothy Threads Property Management Limited | Real estate | 2016 |
| Bottled in Cumbria Ltd | Administrative & support | 2023 |
| Boulder Stream Ltd | Wholesale & retail | 2019 |
| Bous Life Ltd | Manufacturing | 2020 |
| Boxer Security (Cumbria) Ltd | Administrative & support | 2019 |
| Boyd & Sons Property Development Ltd | Real estate | 2021 |
| BR Electrical Cumbria Limited | Professional & scientific | 2025 |
| Bracken Howe Limited | Hospitality | 2012 |
| Brackenbarrow Farm Limited | Agriculture & fishing | 2009 |
| Brackenbarrow Property Group Ltd | Construction | 2024 |
| Bridge Hotel Limited | Hospitality | 1986 |
| Bridge View Flats Cockermouth Ltd | Hospitality | 2015 |
| Briery Meadow Treatment Plant Company Limited | Water & waste | 2021 |
| Bristowe Hill Estates Limited | Hospitality | 1987 |
| Broughton Grange Limited | Real estate | 2017 |
| Brown & Beck Developments Limited | Real estate | 2025 |
| Browne Property Holdings Ltd | Real estate | 2024 |
| BSC Owners Ltd | Households | 2021 |
| Buckhead Capital UK Holdings Ltd | Financial services | 2020 |
| Budo Nord UK Ltd | Wholesale & retail | 2026 |
| Bumblebee Consultancy Ltd | Information & communication | 2023 |
| Burnside Park Limited | Hospitality | 1965 |
| BV Beauty Whitehaven Limited | Health & social care | 2018 |
| BY Clearwater Limited | Information & communication | 2010 |
| C & S Roofing and Renovations Ltd | Construction | 2023 |
| C J Electrical Design Limited | Construction | 2007 |
| C2C Adventures UK Limited | Other services | 2022 |
| Camerton Consultants Limited | Professional & scientific | 2014 |
| Camomile Training Consultants Limited | Professional & scientific | 2000 |
| Camperlite Limited | Wholesale & retail | 2024 |
| CAN DO Martial Arts Cumbria Ltd | Education | 2026 |
| Capital NG Limited | Professional & scientific | 2025 |
| Carabiner Partners Limited | Professional & scientific | 2010 |
| Carpet Shield Limited | Administrative & support | 2021 |
| Casa Bella Keswick Limited | Hospitality | 2025 |
| Casa Interiore Limited | Manufacturing | 2013 |
| Cashflow Advisory Group Ltd | Other services | 2017 |
| Castle Sporting Shoot Limited | Agriculture & fishing | 2015 |
| CBT School Improvement Ltd | Education | 2024 |
| Cbtr Property Limited | Real estate | 2024 |
| CC Commissioning Limited | Administrative & support | 2023 |
| CD Access Consultancy Ltd | Professional & scientific | 2026 |
| Centre for International Learning and Leadership Ltd | Education | 2011 |
| Centre for Leadership Performance | Education | 2011 |
| Cerberus Minerals Limited | Extraterritorial | 2015 |
| CGC Clubhouse Limited | Arts & recreation | 2025 |
| CGF Holdings Ltd | Hospitality | 2020 |
| Cgmi Solutions Limited | Administrative & support | 2025 |
| Chance Camp Limited | Arts & recreation | 2017 |
| Charlotte Davies Ltd | Professional & scientific | 2021 |
| Chattanooga Maryport Limited | Hospitality | 2025 |
| CHB Projects Ltd | Professional & scientific | 2023 |
| CHF Lake District Limited | Construction | 2015 |
| Child-Centred Practice Limited | Education | 2009 |
| Chris Davidson Contracting Limited | Agriculture & fishing | 2018 |
| Chris Foots Ltd | Information & communication | 2021 |
| Christie's Inspection Services Ltd | Professional & scientific | 2014 |
| CJW Surveyors Limited | Professional & scientific | 2021 |
| CKJ Projects Limited | Professional & scientific | 2016 |
| Clarke Rentals Limited | Real estate | 2025 |
| Clint Stamper Training Limited | Education | 2022 |
| CMT Pharma Ltd | Health & social care | 2018 |
| Cocker Harvest Catering Limited | Hospitality | 2016 |
| Cockermouth Chiropody / Podiatry Limited | Health & social care | 2017 |
| Cockermouth Golf Club Limited | Arts & recreation | 2024 |
| Cockermouth Physiotherapy Ltd | Health & social care | 2005 |
| Cockermouth Pilates Limited | Arts & recreation | 2019 |
| Cockermouth School Academy | Education | 2015 |
| Cockermouth TAP Limited | Real estate | 2020 |