| 'A1' Arborists Limited | Agriculture & fishing | 2007 |
| 1 Beast Banks Management Company Limited | Households | 2007 |
| 141 Highgate Management Company Limited | Real estate | 2004 |
| 4 Tynedale Guest Ltd | Hospitality | 2026 |
| 852 Ltd. | Information & communication | 2017 |
| A & M Smith Limited | Agriculture & fishing | 2004 |
| A & S Builders Limited | Construction | 2003 |
| A D (Cumbria) Limited | Professional & scientific | 2002 |
| A Shepherd Building & Repairs Limited | Construction | 2002 |
| A Taste of Lakeland Limited | Extraterritorial | 2003 |
| A W Smyth Limited | Other services | 2002 |
| A, D & a Richardson Limited | Agriculture & fishing | 2006 |
| A.Holden's Limited | Construction | 2002 |
| A2A Advertising Limited | Professional & scientific | 2003 |
| Abbey Electrical (Cumbria) Limited | Manufacturing | 2002 |
| Acrastyle Switchgear Limited | Professional & scientific | 1997 |
| Admontes Limited | Hospitality | 1999 |
| Adrian Bell Livestock Scanning Limited | Agriculture & fishing | 2006 |
| ADRIANAOWEN1964 Ltd | Transport & logistics | 2025 |
| Ai-Gods UK Ltd | Real estate | 2004 |
| AJS Joinery Limited | Construction | 2002 |
| Alfie Johnson (Ground Works) Limited | Construction | 2006 |
| ALI Dudu Ltd | Wholesale & retail | 2024 |
| Alpha Electrics and Building Services Ltd | Construction | 2003 |
| Alphagreen Solutions UK Limited | Wholesale & retail | 2024 |
| Alphajet Ltd | Administrative & support | 1999 |
| Alston Moor Community Transport | Transport & logistics | 2000 |
| Alston Natural Stone Limited | Mining & quarrying | 2002 |
| Alwel Glass & Glazing Co Limited | Construction | 2002 |
| Andrew Fallows Landscaping Ltd | Administrative & support | 2003 |
| Andrew Gale Limited | Agriculture & fishing | 2002 |
| Andrew Harvey Limited | Construction | 1997 |
| Andrew Kelly Couriers Ltd | Transport & logistics | 2026 |
| Andrew Rigg Carpets Limited | Construction | 2002 |
| Andy Martin Builder Limited | Construction | 2003 |
| Anfro Limited | Transport & logistics | 2020 |
| ANN Street Realisations NO.2 Limited | | 1909 |
| Another Space Limited | Education | 2007 |
| Antique Pine Winton Limited | Wholesale & retail | 2003 |
| Apartuk.Com Limited | Real estate | 2005 |
| Appleby Sports Centre Limited | Arts & recreation | 2006 |
| Appleseeds Health Store Limited | Wholesale & retail | 2002 |
| Appletons of Carlisle Limited | Wholesale & retail | 2003 |
| AR Hill Limited | Health & social care | 2003 |
| Ar-Mech Ltd | Manufacturing | 1999 |
| Aranha Limited | Manufacturing | 2006 |
| Arbmasters Limited | Manufacturing | 2006 |
| Arbor Joinery Limited | Construction | 2008 |
| ARC Eden Limited | Financial services | 2004 |
| Arcback Limited | Administrative & support | 2000 |
| Archipelago Choice Limited | Administrative & support | 1998 |
| Arlington Agencies Ltd | Administrative & support | 1995 |
| Arnison & Company Solicitors Limited | Professional & scientific | 2004 |
| Arrawarra Limited | Real estate | 2023 |
| Arun Systems Limited | Professional & scientific | 1990 |
| Ashton-Pitt Limited | Manufacturing | 2005 |
| Atic Records Ltd | Information & communication | 2005 |
| Atlantis Kitchens Limited | Wholesale & retail | 1992 |
| Atlas Physiotherapy Limited | Health & social care | 2000 |
| Austin Kelso & Sons Limited | Construction | 2008 |
| Autocrest Limited | | 1982 |
| Ayle Colliery Company Limited | Wholesale & retail | 1933 |
| B Birch & Sons Ltd | Transport & logistics | 2002 |
| B Johnson Ltd | Construction | 2002 |
| B&D Motors Limited | Wholesale & retail | 2002 |
| B.R.J. Construction Services Limited | Wholesale & retail | 1991 |
| Ballantynes Garage Limited | Wholesale & retail | 2006 |
| Barklace Property Co. Limited | Administrative & support | 1983 |
| Barrow Rugby Football Club Limited(The) | Arts & recreation | 1930 |
| Barton Townley (Barrow) Limited | Wholesale & retail | 1939 |
| Bassenthwaite Lakeside Lodges Limited | Hospitality | 2012 |
| Bath Street News Limited | Wholesale & retail | 2006 |
| Battys Discount Drinks Store Limited | Wholesale & retail | 2002 |
| BB Services Cumbria Ltd | Wholesale & retail | 2020 |
| Beck Electronics Limited | Manufacturing | 1986 |
| Beee Limited | Administrative & support | 2005 |
| Bellcare Domiciliary Care Services Limited | Health & social care | 2002 |
| BEN Dodgson Limited | Professional & scientific | 2002 |
| Benn Motors Limited | Wholesale & retail | 2002 |
| Bill Hodgson Sales Limited | Wholesale & retail | 2005 |
| Billy Bowman Music Limited | Wholesale & retail | 2004 |
| Blackbelt 360 Global Limited | Information & communication | 2004 |
| Blackett-Ord Conservation Limited | Professional & scientific | 2003 |
| Blain Associates Limited | Professional & scientific | 2007 |
| Blencogo House Farm Limited | Agriculture & fishing | 2002 |
| Blixie Ltd | Information & communication | 2020 |
| Bojangles Professional Hair Studio Limited | Other services | 2003 |
| Bombycilla Limited | Professional & scientific | 2020 |
| Books Cumbria Limited | Wholesale & retail | 2000 |
| Boudoir Pink Ltd | Wholesale & retail | 2006 |
| Boutique Lodge Parks Limited | Hospitality | 2023 |
| Bowness Farms Limited | Agriculture & fishing | 2006 |
| Braehead Property Investments Limited | Real estate | 1996 |
| Braesteads Farm Limited | Agriculture & fishing | 1993 |
| Braklon Limited | Wholesale & retail | 1976 |
| Bram Associates Limited | Hospitality | 2006 |
| Brampton Golf Club Limited | Hospitality | 2025 |
| Brampton Travel Limited | Administrative & support | 1986 |
| Brampton Woodworks Limited | Manufacturing | 2002 |
| Brantfell Flats (Bowness) Limited | Households | 2006 |