| 160 Abbey Street Freehold Limited | Households | 2014 |
| 1816 Crown Property Limited | Households | 2024 |
| 20/20 E&N Solutions Limited | Professional & scientific | 2024 |
| 26 at 27 Limited | Arts & recreation | 2001 |
| 3 Lorton Street Limited | Real estate | 2021 |
| 32 Marlborough Buildings Bath Management Company Limited | Households | 1998 |
| 3D Travel Cumbria Limited | Transport & logistics | 2025 |
| 4 Lorton Street Limited | Real estate | 2020 |
| 4 Your Home 2 Your Home Ltd. | Wholesale & retail | 2018 |
| 4WARD Digital Limited | Professional & scientific | 2020 |
| 55NORTH Boat Building Limited | Manufacturing | 2021 |
| 7STAR Barber Shop Limited | Other services | 2024 |
| A & B Catering Limited | Hospitality | 2003 |
| A & N Solutions Ltd | Administrative & support | 2024 |
| A Beattie (Keswick) Limited | Construction | 2004 |
| A Gunn Construction Ltd | Construction | 2025 |
| A Gunn Property Ltd | Real estate | 2025 |
| A S Utilities & Plant Ltd | Construction | 2016 |
| A&Ds Property Enterprises Limited | Real estate | 2024 |
| A.& E.Marshall.Limited | Real estate | 1947 |
| A.D. Beard Limited | Administrative & support | 2000 |
| A.Downey Construction Ltd | Construction | 2016 |
| A.F. Norman Chemists Limited | Wholesale & retail | 2002 |
| A.G. Electricals Limited | Construction | 2005 |
| A.J. Henderson Ltd | Health & social care | 2024 |
| A3 Property Consultants Limited | Other services | 2014 |
| Aaal Limited | Wholesale & retail | 2025 |
| Aadhi Store Ltd | Wholesale & retail | 2025 |
| Absolute Beauty Academy Ltd | Education | 2020 |
| Ace Access Scaffolding Limited | Construction | 2022 |
| Acer Holdings Limited | Construction | 2015 |
| Acorn House (Keswick) Limited | Hospitality | 2010 |
| ACS Nuclear Safety Limited | Professional & scientific | 2019 |
| Activus Outdoors Limited | Transport & logistics | 2009 |
| Adhd 4 ME Ltd | Health & social care | 2025 |
| Adrian Kennedy Building Limited | Construction | 2026 |
| Adriana Garrasini Ltd | Health & social care | 2018 |
| Advanced Building Techniques Limited | Construction | 2008 |
| Advent Project and Management Services Limited | Administrative & support | 2017 |
| Adventure Awards Limited | Education | 2020 |
| Adwick Waste Recycling Limited | Water & waste | 2012 |
| Aerial Works Ltd | Construction | 2021 |
| Ahcot Ltd | Other services | 2019 |
| Aim-Point Air Rifles & Accessories (Cumbria) Ltd | Extraterritorial | 2016 |
| AJ Property Lettings Limited | Real estate | 2021 |
| Akoroa Limited | Professional & scientific | 2019 |
| Alana's Laundry Basket Limited | Other services | 2022 |
| Alauna Vapour Store Ltd | Wholesale & retail | 2015 |
| Alderill Ltd | Professional & scientific | 2017 |
| Alessandro & Carla Limited | Hospitality | 2018 |
| Alimed Limited | Health & social care | 2022 |
| Allan Green Optical Limited | Hospitality | 1991 |
| Allanadriano Limited | Hospitality | 2011 |
| Allerdale Limited | Hospitality | 2018 |
| Allport Electrical & Fire Security Ltd | Construction | 2017 |
| Allyson Mcdermott Collections Limited | Manufacturing | 2021 |
| ALM Engineering (Cumbria) Limited | Professional & scientific | 2011 |
| Almac Engineers Ltd | Professional & scientific | 2015 |
| Altered Capital UK LLP | | 2020 |
| Always Paddle Your Own Canoe Limited | Professional & scientific | 2016 |
| AMB Projects Limited | Professional & scientific | 2023 |
| Ameg Developments Ltd | Construction | 2014 |
| Amersham Technologies Ltd | Professional & scientific | 1998 |
| AMY Automotive Limited | Manufacturing | 2011 |
| Andrew Graham Wealth Management Ltd | Professional & scientific | 2017 |
| Andrew Lowden Plant & Agricultural Repairs Ltd | Manufacturing | 2010 |
| Andrew Shaw Cumbria Ltd | Construction | 2023 |
| Aneta & RAF Properties Ltd | Real estate | 2025 |
| ANL Holdings Limited | Real estate | 2017 |
| Anns Hill Farm | Agriculture & fishing | 2009 |
| Antesolis Consulting Services Limited | Information & communication | 2002 |
| API Fitness Limited | Arts & recreation | 2018 |
| Applied Nuclear Physics Ltd | Professional & scientific | 2022 |
| Aquaflex Canine Clinic Limited | Other services | 2025 |
| Aquallite Data Ltd | Information & communication | 2023 |
| AR Hefford Limited | Construction | 2007 |
| Ashby Rose Limited | Hospitality | 2026 |
| Askew Business Services Ltd | Professional & scientific | 2024 |
| Aslanamca Ltd | Hospitality | 2025 |
| AT Rentals Limited | Real estate | 2018 |
| Atlantic Way Projects Limited | Professional & scientific | 2024 |
| Atuka Limited | Professional & scientific | 2001 |
| Auntie BAC Cleaners Ltd | Other services | 2019 |
| AWE-3PS Ltd | Professional & scientific | 2015 |
| AYP Solutions Limited | Administrative & support | 2012 |
| B & J Jackson | Health & social care | 2006 |
| B & M Blinds Limited | Manufacturing | 2000 |
| B & M Homestyle Limited | Wholesale & retail | 2023 |
| B & V Richardson Properties Ltd | Real estate | 2021 |
| B Cockton Electrical Limited | Construction | 2004 |
| B.Me B.We Wellbeing Limited | Wholesale & retail | 2023 |
| Bagheera in the Lakes Limited | Hospitality | 2023 |
| Baker Street Properties Limited | Construction | 2014 |
| Bar Thirty Two Limited | Hospitality | 2005 |
| Barkhouse Woodworks Ltd | Manufacturing | 2020 |
| Barton Limited | Real estate | 1985 |
| Bassenthwaite & District Motor Club Limited | Arts & recreation | 1981 |
| Bassenthwaite Lake Station Limited | Hospitality | 2016 |
| BCA Developments Ltd | Real estate | 2026 |
| Beag Limited | Construction | 2009 |