| 'O' Connor Fencing Limited | Manufacturing | 1982 |
| 13-17 Jericho Road Freehold Limited | Households | 2015 |
| 1633 Limited | Hospitality | 2018 |
| 595 Management Limited | Professional & scientific | 2024 |
| A.R.B Blade Services Ltd | Manufacturing | 2023 |
| Abbey Cabs West Cumbria Limited | Transport & logistics | 2022 |
| Abby's Ltd | Hospitality | 2022 |
| ABC Scaffolding (Cumbria) Ltd | Construction | 2018 |
| Abcd Properties Limited | Real estate | 2010 |
| Absha Limited | Health & social care | 2023 |
| Accessories Warehouse Limited | Manufacturing | 2003 |
| ACT Logic Limited | Financial services | 2025 |
| Activelife Medic-Care UK Ltd | Health & social care | 2022 |
| Acton & FOX Limited | Construction | 2021 |
| Acton Court (Whitehaven) Limited | Households | 2005 |
| Adair Holdings Ltd | Real estate | 2016 |
| Adam Gill | Administrative & support | 2011 |
| Adam JD Property Ltd | Households | 2025 |
| Admiral House Limited | Extraterritorial | 2008 |
| Adstaphimed Limited | Health & social care | 2022 |
| AFM GAS Services Ltd | Other services | 2002 |
| AGS Catering Ltd | Hospitality | 2024 |
| Ahora Mazda Limited | Hospitality | 2019 |
| Ahorita Limited | Professional & scientific | 2005 |
| Aj's Networking Solutions Ltd | Construction | 2023 |
| AJA Entertainment Ltd | Arts & recreation | 2024 |
| ALB Investments Ltd | Real estate | 2023 |
| ALI TAJ Tandoori Ltd | Hospitality | 2025 |
| Alive Entertainment Group Limited | Administrative & support | 2021 |
| Aliyah Thompson Properties Cumbria Limited | Real estate | 2024 |
| Alternative Technology Solutions Limited | Manufacturing | 2016 |
| Alya Property Development Ltd | Real estate | 2022 |
| AMA System Engineering Ltd | Professional & scientific | 2018 |
| Amstef Limited | Administrative & support | 2010 |
| Amtek Building & Plastering Ltd | Construction | 2018 |
| Anchor Pilates Ltd | Arts & recreation | 2026 |
| Antyk 2013 Limited | Wholesale & retail | 2013 |
| Archimedes Lifting Engineering Consulting Ltd | Professional & scientific | 2024 |
| Aremen Advanced Healthcare Ltd | Health & social care | 2024 |
| Artemis Automation Consulting Ltd | Information & communication | 2026 |
| Artisan Mechatronics Limited | Professional & scientific | 2016 |
| Aslnz Ltd | Professional & scientific | 2017 |
| ASM Biotec Ltd | Professional & scientific | 2023 |
| Atalas Premium Pets Ltd | Wholesale & retail | 2017 |
| Atalas Textiles Ltd | Wholesale & retail | 2023 |
| Aubrey Solutions Limited | Wholesale & retail | 2020 |
| Auttaa Limited | Professional & scientific | 2017 |
| B Web Locum Limited | Health & social care | 2014 |
| B.A.F. Contracting Ltd | Construction | 2020 |
| Babel Services Ltd | Real estate | 2025 |
| Bakes by Gina Academy CIC | Manufacturing | 2024 |
| Bakes by Gina Ltd | Manufacturing | 2023 |
| Bargain House Cumbria Ltd | Wholesale & retail | 2013 |
| Barry's Corner Limited | Hospitality | 1989 |
| Beach Road Bakehouse Ltd | Hospitality | 2025 |
| Beacon Agri Technologies Limited | Manufacturing | 2023 |
| BEE Engineering Solutions Ltd | Professional & scientific | 2025 |
| Bega Court Estate Management Company Limited | Real estate | 1995 |
| Berahan Limited | Hospitality | 2024 |
| BH Furniture (Cumbria) Ltd | Wholesale & retail | 2018 |
| BHS Property Services Limited | Construction | 2011 |
| Bleach Green Land and Property Developments Ltd | Construction | 2021 |
| Blomfield's Limited | Wholesale & retail | 2003 |
| Blue Dog Management (North) Ltd | Professional & scientific | 2024 |
| Bondholder Plus Limited | Administrative & support | 2017 |
| Bourdain Ltd | Information & communication | 2024 |
| Bransty Community Group CIC | Health & social care | 2024 |
| Bravita Clinic Ltd | Wholesale & retail | 2025 |
| Bravita Cosmetics Ltd | Wholesale & retail | 2025 |
| Brockbank, Curwen Cain & Hall Limited | Professional & scientific | 2003 |
| Brookson (5066L) Limited | Professional & scientific | 2007 |
| Brookson (5408A) Limited | Administrative & support | 2007 |
| Byom Ltd | Information & communication | 2026 |
| BZT Group Ltd | Construction | 2026 |
| C Competitions Ltd | Arts & recreation | 2023 |
| C J Auto Repairs (Cumbria) Ltd | Wholesale & retail | 2024 |
| C L Technical Services Ltd | Professional & scientific | 2004 |
| C W Property Developments (Cumbria) Ltd | Construction | 2011 |
| C&K Travel Limited | Transport & logistics | 2024 |
| Camskill (UK) Limited | Wholesale & retail | 2004 |
| Canavan Brickwork Limited | Construction | 2021 |
| Car Safety Solutions Ltd | Construction | 2024 |
| Carg Haven Commercial Investment Ltd | Real estate | 2025 |
| Carla Louise Limited | Professional & scientific | 2024 |
| Carstone Limited | Transport & logistics | 2010 |
| Carter Project Services Ltd | Professional & scientific | 2026 |
| Casa Whitehaven Limited | Hospitality | 2024 |
| Castle Mews Limited | Households | 1990 |
| Cdib Property Ltd | Real estate | 2025 |
| CDN Services Limited | Professional & scientific | 2023 |
| Celticit Ltd | Information & communication | 2023 |
| Certus Field Services Ltd | Professional & scientific | 2014 |
| Cgst Cumbria Limited | Arts & recreation | 2016 |
| Chanceselect Limited | Construction | 1991 |
| Chris Mather Building and Plastering Ltd | Construction | 2021 |
| Claire's Craft Workshop Ltd | Wholesale & retail | 2013 |
| Clarifi Surface Care Ltd | Administrative & support | 2026 |
| Clarkson Cottages Ltd | Real estate | 2022 |
| Cleanteam (Cumbria) Limited | Administrative & support | 2024 |
| Clinic Aesthetics Group Limited | Health & social care | 2026 |