| 11-21 Admiral Close RTM Company Limited | Households | 2026 |
| 14 Boat Charters Limited | Transport & logistics | 2012 |
| 1418 Web Design and Hosting Ltd | Information & communication | 2021 |
| 365 Electrical Ltd | Construction | 2024 |
| 37 Park END Road Limited | Households | 2017 |
| 43 Queen Street Limited | Households | 1989 |
| 5-6 New Street Management Company Limited | Households | 2022 |
| A & B Forsters Ltd | Agriculture & fishing | 2025 |
| A Heywood Performance Limited | Wholesale & retail | 2026 |
| A Hunter Roofing and Renovations Ltd | Construction | 2016 |
| A K (Cumbria) Ltd | Real estate | 2008 |
| A R Scott Limited | Agriculture & fishing | 2002 |
| A Storey Roofing Contractor Ltd | Construction | 2013 |
| A T Aitken & SON Limited | Construction | 2015 |
| A Tubman Ltd | Professional & scientific | 2026 |
| A&I Properties (Cumbria) Limited | Real estate | 2024 |
| A.J. Johnson Limited | Manufacturing | 2003 |
| A.M.C Lifting Solutions Limited | Agriculture & fishing | 2014 |
| A.V.S.Cumbria Limited | Administrative & support | 2017 |
| A2K Cleaning Services & Laundry Studio Ltd | Other services | 2004 |
| A2K Cleaning Services Limited | Administrative & support | 2018 |
| Aaima Noor Properties Ltd | Real estate | 2024 |
| AB Accountancy Solutions Ltd | Professional & scientific | 2018 |
| AB Property Solutions (Cumbria) Ltd | Households | 2024 |
| ABC 2014 Limited | Professional & scientific | 2013 |
| Abld Engineering Limited | Professional & scientific | 2023 |
| Abrar 17 Ltd | Hospitality | 2019 |
| Absolute Sports and Nutrition Ltd | Wholesale & retail | 2022 |
| Absolute Storage & Materials Handling Limited | Administrative & support | 2014 |
| Access Pro Scaffolding Limited | Construction | 2016 |
| Acrebind Limited | Hospitality | 1987 |
| Acumen Interiors Limited | Wholesale & retail | 2018 |
| Adamedia Ltd | Information & communication | 2015 |
| Advanced Aesthetics DR Ewelina Emilianowicz Ltd | Health & social care | 2024 |
| Advanced Physio by Emilianowicz Ltd | Health & social care | 2023 |
| Advocates Pharma Holdings Limited | Financial services | 2013 |
| AGD Cockermouth Ltd | Other services | 2026 |
| AGM Facilities Managment Ltd | Administrative & support | 2025 |
| Agnes Control Limited | Information & communication | 2019 |
| Agra Indian Ltd | Hospitality | 2025 |
| Agriessence Ltd | Agriculture & fishing | 2026 |
| Agriharvest Services Limited | Agriculture & fishing | 2025 |
| Aimtowin Limited | Hospitality | 2011 |
| AJ Woodburn Properties T/As Cumbria Cottages Limited | Hospitality | 2023 |
| AJD Consultancy (Cumbria) Ltd | Professional & scientific | 2024 |
| AJT Properties (Cumbria) Ltd | Real estate | 2023 |
| AK Electrical (Cumbria) Limited | Construction | 2022 |
| Akecheta Entreprises Limited | Hospitality | 2015 |
| Akinmuj Global Investments Ltd | Hospitality | 2026 |
| Akyuz Electrical Solutions and Consultancy Ltd | Manufacturing | 2021 |
| Al's Kitchen Limited | Wholesale & retail | 2015 |
| Alchemist Housing Limited | Households | 2021 |
| Alexandra Mckenzie PT Ltd | Arts & recreation | 2025 |
| Alfie's Hairdressing Ltd | Other services | 2022 |
| ALL Clear Window Cleaning Cumbria Ltd | Administrative & support | 2025 |
| Allerdale Thermal Insulation Limited | Construction | 2022 |
| Allhaver Limited | Construction | 2013 |
| Allison Nuclear Limited | Professional & scientific | 2012 |
| Almo Group Limited | Real estate | 2019 |
| Alpha Denture Clinic Limited | Health & social care | 2012 |
| Alpine Cleaning Services Limited | Administrative & support | 2013 |
| Alvi Brothers Ltd. | Manufacturing | 2017 |
| Alvi Holdings Ltd | Other services | 2023 |
| AM2 Consulting Limited | Professional & scientific | 2003 |
| Amani Studios Ltd | Other services | 2019 |
| Amartiste Limited | Wholesale & retail | 2019 |
| Ambitious Hype Group Limited | Information & communication | 2022 |
| Amelia Wilson Interiors Limited | Professional & scientific | 2015 |
| Ameluc Ltd | Professional & scientific | 2020 |
| AMH Solutions U.K. Ltd | Professional & scientific | 2022 |
| Anabia Food Ltd | Hospitality | 2021 |
| Anamil Limited | Public administration | 2019 |
| Andrew Coid Removals (Cumbria) Ltd | Real estate | 2026 |
| Andy’S Newsagents Limited | Wholesale & retail | 2025 |
| Anonymous Competitions Ltd | Arts & recreation | 2024 |
| Anthros Advisory Limited | Professional & scientific | 2026 |
| APB Construction Management Limited | Professional & scientific | 2026 |
| Apex Commissioning Ltd | Construction | 2023 |
| APK Aggregates & Recycling (NE) Ltd | Construction | 2022 |
| APK Demolition & Remediation Ltd | Water & waste | 2020 |
| Arbiya 25 Ltd | Hospitality | 2025 |
| Arborscape Environmental Services Ltd | Agriculture & fishing | 2024 |
| ARC UK Estates Limited | Real estate | 2022 |
| ARP Electrical Solutions Ltd | Construction | 2025 |
| AS Commissioning Services Ltd | Professional & scientific | 2026 |
| Asbestos Removal Cumbria Ltd | Construction | 2025 |
| Ashcroft Kitchen Installations Limited | Construction | 2012 |
| Ashfield Building and Plumbing Ltd | Construction | 2017 |
| Ashfield Plumbing Cumbria Ltd | Construction | 2019 |
| Askk Engineering Ltd | Professional & scientific | 2018 |
| Asquith-Vallance Limited | Other services | 2015 |
| Astute Commissioning Ltd | Professional & scientific | 2023 |
| ASW (Properties) Limited | Real estate | 2004 |
| AT Accountancy (Cumbria) Limited | Professional & scientific | 2025 |
| Atkinson Inspection & Testing Ltd | Professional & scientific | 2024 |
| Atwood Scott Limited | Professional & scientific | 2023 |
| Autocraft Limited | Extraterritorial | 1981 |
| Autotek West Limited | Wholesale & retail | 2019 |
| Aveeva Investments Limited | Real estate | 2019 |
| Avenger & Sunbeam Owners Club Ltd | Other services | 1998 |