| Atkinson Forecourt Group Limited | Extraterritorial | 2019 |
| Atkinson Properties and Developments Ltd | Real estate | 2025 |
| Atkinson Ritson Solicitors Limited | Professional & scientific | 2011 |
| Atlas Developments Leisure (Carlisle) LLP | | 2012 |
| Atlas Developments Property Management Ltd | Real estate | 2023 |
| Atorix Ltd | Manufacturing | 2025 |
| ATT Commercials Limited | Wholesale & retail | 2011 |
| Auction House Cumbria Limited | Real estate | 2012 |
| Audek Timber Limited | Wholesale & retail | 2025 |
| Audio Visual Impact Limited | Manufacturing | 2013 |
| Audit Systems Ltd | Information & communication | 2008 |
| Augeo Innovare Ltd | Information & communication | 2025 |
| Augustus (Carlisle) Limited | Real estate | 2018 |
| Austin Friars | Education | 1985 |
| Austin Reed Group Limited | Extraterritorial | 2016 |
| Austin Reed Limited | Wholesale & retail | 2016 |
| Austwick Media Ltd | Information & communication | 2026 |
| Austwick Rentals Ltd | Real estate | 2025 |
| Auto Clean Car Wash Limited | Administrative & support | 2026 |
| Auto Clean Hand Car Wash Limited | Other services | 2023 |
| Auto Pristino Ltd | Wholesale & retail | 2024 |
| Auto Recoveries Limited | Wholesale & retail | 2011 |
| Autoshots Limited | Wholesale & retail | 2024 |
| Autosparx Limited | Wholesale & retail | 2019 |
| Autosport Logistical Solutions Limited | Transport & logistics | 2011 |
| Autotech Carlisle Limited | Wholesale & retail | 2005 |
| Autovolks (Carlisle) Limited | Wholesale & retail | 2001 |
| Avalon Pilates Limited | Arts & recreation | 2024 |
| Avanti Business Services Limited | Professional & scientific | 2020 |
| Avara Civils Ltd | Construction | 2025 |
| Avenue Properties Cumbria Ltd | Real estate | 2024 |
| Aviatech Consultants Limited | Other services | 2012 |
| Avidrail Ltd | Administrative & support | 2017 |
| Avifarm Services Ltd | Agriculture & fishing | 2025 |
| Avro Properties Limited | Real estate | 2020 |
| Avyukth (Carlisle) Limited | Wholesale & retail | 2026 |
| AW (Carlisle) Limited | Extraterritorial | 2011 |
| AW Fusionflow Ltd | Professional & scientific | 2025 |
| AWB Carlisle Ltd | Other services | 2023 |
| AWT Transport Limited | Transport & logistics | 2019 |
| Axis Golf Limited | Wholesale & retail | 2015 |
| Aztec Adventure Play Ltd | Arts & recreation | 2023 |
| B & B Attachments (Holdings) Limited | Manufacturing | 2006 |
| B & K Steel Erectors Limited | Construction | 2005 |
| B and M Plastering Limited | Construction | 2014 |
| B J Laidlaw & Co Limited | Professional & scientific | 2011 |
| B LEE Developments Limited | Construction | 2025 |
| B Monkhouse Limited | Transport & logistics | 2009 |
| B Short Limited | Professional & scientific | 2010 |
| B&S Cleaning Services Ltd | Administrative & support | 2025 |
| B, R & J Hurford Limited | Real estate | 2006 |
| B-Spoke Automotive Limited | Wholesale & retail | 2019 |
| B., a. & J. Watson Ltd | Real estate | 2019 |
| B.A.R Renovations Limited | Construction | 2024 |
| B.L.Gilbert(Barrow)Limited | Wholesale & retail | 1964 |
| B.Miller&Sons Drainage Services Ltd | Water & waste | 2018 |
| B14 Enterprises Ltd | Real estate | 2019 |
| Babe Brand Ltd | Wholesale & retail | 2023 |
| Baby & Toddler Swimmers Ltd | Health & social care | 2015 |
| Baby I Love YOU (Carlisle) Limited | Health & social care | 2019 |
| Babywearing Education Network CIC | Education | 2025 |
| Bacard Holdings Limited | Real estate | 2013 |
| Bacard Renewable Investments Limited | Financial services | 2022 |
| Badger Face Texel Society Limited | Agriculture & fishing | 2018 |
| Badr Adventures UK Ltd | Other services | 2024 |
| BAE Trading Ltd | Transport & logistics | 2017 |
| Bailey and Stott Ltd | Construction | 2011 |
| BAJ Electrical Engineering Ltd | Construction | 2025 |
| Bake District Media Ltd | Information & communication | 2026 |
| Baked North Limited | Extraterritorial | 2020 |
| Baker and Barker Ltd | Extraterritorial | 2014 |
| Bakerwood Marquees and Events Limited | Professional & scientific | 2010 |
| Baking Time Club Limited | Wholesale & retail | 2016 |
| Bako & Nagy Ltd | Manufacturing | 2021 |
| BAL Electrical Ltd | Construction | 2013 |
| Ballers Sports Bars Ltd | Hospitality | 2025 |
| Balmoral Court Flats Management Carlisle Limited | Households | 1976 |
| Balmoral House Management (Keswick) Limited | Households | 1998 |
| Bandit Holdings Limited | Real estate | 2022 |
| Bandwagon Rentals Ltd | Administrative & support | 2025 |
| Bar Solo Limited | Hospitality | 2011 |
| Bar Solo Solo Ltd | Hospitality | 2020 |
| Bar Yellowjacket Ltd | Hospitality | 2017 |
| Barakat Shop Limited | Wholesale & retail | 2025 |
| Barbara Craig Business Consultancy Limited | Professional & scientific | 2022 |
| Barbara Turnbull Limited | Education | 2012 |
| Barker & Brown Associates Ltd | Professional & scientific | 2024 |
| Barking Dog (UK) Limited | Information & communication | 2005 |
| Barmac Electrical Limited | Construction | 2000 |
| Barnaby Side Farms Limited | Agriculture & fishing | 1957 |
| Barnes Windows Limited | Construction | 2013 |
| Barnham Bricklaying Limited | Construction | 2023 |
| Barnsley Heat Network Limited | Construction | 2024 |
| Barrett & Co (Carlisle) Limited | Professional & scientific | 2002 |
| Barrock Park Cottages Management Limited | Households | 1984 |
| Barron & Jamieson Limited | Construction | 2003 |
| Barry Cook Ltd | Other services | 2014 |
| Base Express Takeaway (Carlisle) Ltd | Hospitality | 2022 |
| Base Leisure Industries Limited | Construction | 2019 |
| Bastionai Limited | Information & communication | 2025 |