| Ashleigh Bishop Limited | Wholesale & retail | 2005 |
| Ashridge Trees Limited | Wholesale & retail | 2003 |
| Ashton Bulk Limited | Mining & quarrying | 2007 |
| AT Rookery Farm Limited | Real estate | 2017 |
| Autocraft Equipment Limited | Wholesale & retail | 1987 |
| Automania (South West) Ltd | Wholesale & retail | 1988 |
| Avalon Climate Engineering Limited | Administrative & support | 2004 |
| Avalon Design Services Ltd | Administrative & support | 2007 |
| Avalon Guns Limited | Wholesale & retail | 2006 |
| Avenue Lawn Tennis Club(Burnham on Sea)Limited(The) | Arts & recreation | 1923 |
| Avon Bulbs Limited | Agriculture & fishing | 2003 |
| Awair | Professional & scientific | 2000 |
| Awair (UK) Ltd | Professional & scientific | 2000 |
| Awair Technology Ltd | Professional & scientific | 2000 |
| Axbridge Accountancy Ltd | Professional & scientific | 2004 |
| Axis Business Interiors Limited | Construction | 1999 |
| Axis First Limited | Information & communication | 1981 |
| B & D Investment Properties Limited | Real estate | 2006 |
| B & P News Ltd | Transport & logistics | 2026 |
| B J Campbell (South West) Holdings Limited | Financial services | 2020 |
| B. G. Carpenter Limited | Manufacturing | 2002 |
| B.E.B. Properties Limited | Real estate | 2001 |
| B2B Research Limited | Extraterritorial | 2007 |
| Bahram Limited | Health & social care | 2007 |
| Bailey Hill Bookshop Limited | Wholesale & retail | 2007 |
| Batch Country House Limited | Hospitality | 2006 |
| Bath & West Enterprises Limited | Real estate | 1994 |
| Bath Bespoke Joinery Company Limited | Construction | 2000 |
| Bath House Hotel Limited | Hospitality | 2003 |
| Bath Potters Supplies Limited | Arts & recreation | 2005 |
| Batmink Properties Limited | Real estate | 2006 |
| Bay Side Hotel Limited | Hospitality | 1995 |
| Baynton Williams Removals & Storage Limited | Transport & logistics | 2003 |
| BCK Joinery Limited | Construction | 2003 |
| Beachlands Developments Limited | Construction | 2003 |
| Beech Bros. & Co. (Bath) Limited | | 1971 |
| Beech Tree Dental Surgery Limited | Health & social care | 2021 |
| Beer Court (Yeovil) Management Limited | Households | 1995 |
| Before Dawn Limited | Information & communication | 2003 |
| Belmont Villa Care Home Limited | Health & social care | 2001 |
| Benjamin and Beauchamp Architects Limited | Professional & scientific | 2007 |
| Bennington Consultancy Services Limited | Information & communication | 2019 |
| Bentham Limited | Wholesale & retail | 2000 |
| Berry and Escott Limited | Professional & scientific | 2001 |
| Besich Limited | Extraterritorial | 2021 |
| Bette & Barb Ltd | Extraterritorial | 2013 |
| Big and Tall Warehouse Limited | Extraterritorial | 2007 |
| Bigwoods Agri Ltd | Real estate | 1978 |
| Biotects Limited | Information & communication | 2003 |
| Bird & Sons (Winscombe) Limited | Real estate | 1921 |
| Biscuitbox Limited | Information & communication | 2004 |
| Black Dog South West Ltd | Construction | 2015 |
| Blackdown Estates Limited | Real estate | 2006 |
| Blackdown Hills Accounting Limited | Professional & scientific | 2006 |
| Blackhouse Farms Limited | Wholesale & retail | 1977 |
| Blenheim Road Management Company Limited | Administrative & support | 1981 |
| Blib-Blabs Limited | Information & communication | 2014 |
| Blorenge Guest House Limited | Hospitality | 2002 |
| Bloxham & Barlow Limited | Real estate | 2007 |
| Blue Space Design Limited | Professional & scientific | 2007 |
| BML Original Limited | Manufacturing | 2007 |
| BN Keedwell Abnormal Load Services Ltd | Transport & logistics | 2019 |
| BO LEE Gallery Ltd | Wholesale & retail | 2022 |
| Bobs Tyres Limited | Wholesale & retail | 2002 |
| BOI NA Brasa Ltd | Wholesale & retail | 2025 |
| Bond I.T. Systems Ltd | Information & communication | 2003 |
| Borough Venture Limited(The) | Construction | 1983 |
| Bowdens Limited | Real estate | 2004 |
| Bradford and Sons Limited | Wholesale & retail | 1893 |
| Bradfords Coal Limited | Professional & scientific | 1981 |
| Braunton Residential Home Ltd | Health & social care | 2002 |
| Brereton Properties Limited | Construction | 2002 |
| Brewis Engineering Limited | Manufacturing | 2003 |
| Bridge Accountancy Services Limited | Professional & scientific | 2002 |
| Bridgwater & District Motor Club Limited | Arts & recreation | 1970 |
| Bridgwater Angling Association Limited | Agriculture & fishing | 1992 |
| Bridgwater Funeral Services Limited | Other services | 2010 |
| Bridgwater Grain Company Limited(The) | Extraterritorial | 1959 |
| Bridgwater Sports Ground Limited(The) | Real estate | 1925 |
| Brimsmore (Management) Limited | Households | 1974 |
| Brisgal Limited | Health & social care | 2019 |
| Brooksbank Bars Limited | Hospitality | 2001 |
| Brown & Forrest Bistro Limited | Manufacturing | 2011 |
| Brown and Forrest Limited | Manufacturing | 2006 |
| Brown COW Organics Limited | Manufacturing | 2005 |
| Bryger Farms Limited | Agriculture & fishing | 2007 |
| BSE Frome Ltd | Hospitality | 1987 |
| Bulk Hardware Limited | Wholesale & retail | 1974 |
| Bumper Films Limited | Other services | 1989 |
| Burnham and Berrow Golf Club Limited | Arts & recreation | 1993 |
| Burnham Plastering & DRY Lining Limited | Construction | 1997 |
| Burnham Surveying Services Limited | Administrative & support | 2007 |
| Burnham-On-Sea Motor Club Limited | Arts & recreation | 1974 |
| Burning Cliff Productions Limited | Information & communication | 2018 |
| Business Money Europe Ltd | Information & communication | 2010 |
| Buy and Save (Tiverton) Limited | Wholesale & retail | 1998 |
| Buy ME Bathrooms Limited | Extraterritorial | 2006 |
| C & J Clark (Senior Executive) Trustees Limited | Administrative & support | 1992 |
| C & J Clark Pension Fund Trustees Limited | Administrative & support | 1992 |
| C & J Dornom Limited | Agriculture & fishing | 2003 |