| Bader College | Education | 1993 |
| Badger Clothing Company Limited | Wholesale & retail | 2005 |
| Badger Property UK Ltd | Real estate | 2021 |
| Baedekers Limited | Hospitality | 1984 |
| Baedekers Restaurants Limited | Hospitality | 1984 |
| Baines Properties Limited | Real estate | 2003 |
| Ballantrae Ltd | Administrative & support | 1999 |
| Ballincourt Maintenance Limited | Households | 2002 |
| Ballz.Com Limited | Administrative & support | 2007 |
| Bang! Cybermarketing | | 1996 |
| Barham Developments Limited | Construction | 2007 |
| Baronsmede Family Homes Limited | Health & social care | 2002 |
| Barrington Holdings Limited | Professional & scientific | 1995 |
| Barrington House Limited | Other services | 1995 |
| Barrington Rentals Limited | Other services | 1958 |
| Barry & Co Limited | Professional & scientific | 1993 |
| Barry a Ransom Limited | Construction | 2002 |
| Bartletts Hastings Limited | Wholesale & retail | 2006 |
| BAT and Ball Cricket Coaching Limited | Arts & recreation | 2006 |
| Battle Tax Limited | Professional & scientific | 2004 |
| Bb's Hair & Beauty Ltd | Other services | 2003 |
| Bear Road 245 to 247 RTM Company Limited | Households | 2007 |
| Beaudown Developments Limited | Real estate | 1964 |
| Beauty Bible Limited | Extraterritorial | 2003 |
| Beaveridge Limited | Construction | 1997 |
| Beehive Hair Limited | Other services | 2002 |
| Belfort Property Consultants Limited | Professional & scientific | 1990 |
| Bell FAX Limited | | 1988 |
| Belvedere Residents Company Limited | Households | 1986 |
| BEN Read Design Limited | Professional & scientific | 2002 |
| Bendales Fire Alarms | | 1999 |
| Benfield Legal Limited | Professional & scientific | 2021 |
| Benjamin Liddell Ltd | Professional & scientific | 2004 |
| Bensleys Timber Maintenance Company Limited | Other services | 1986 |
| Berkeley Alexander Insurance Services | | 1994 |
| Berry Robinson Restorations Limited | Other services | 2002 |
| Bespoke Design Services Limited | Professional & scientific | 2004 |
| Best Demolition Limited | Construction | 2005 |
| Bestcroft Limited | Information & communication | 2004 |
| Bestdean Limited | Real estate | 1997 |
| Betts & Loyd Butchers Limited | Wholesale & retail | 2004 |
| Bexhill Youth and Community Association | Other services | 1995 |
| Beyond Waste Ltd | Professional & scientific | 2003 |
| BGG UK Limited | Administrative & support | 2006 |
| Big BEN Limited | Real estate | 2003 |
| Big Cat Trading Company Limited | Extraterritorial | 1997 |
| Biker Engineering Co. Limited | Administrative & support | 1950 |
| Bio-Productions Limited | Manufacturing | 1994 |
| Biopure Europe Limited | Professional & scientific | 2010 |
| Birchwood Auto Limited | Wholesale & retail | 2008 |
| Birchwood Garages Limited | Professional & scientific | 1996 |
| Birchwood Intermediate Limited | Professional & scientific | 2008 |
| Birdie's Solutions Ltd | Construction | 2025 |
| Black Fish Design Limited | Extraterritorial | 2005 |
| Blackburn IT Services Limited | Information & communication | 1999 |
| Blacklands Property Holdings Limited | Households | 1997 |
| Blackmarket VIP LLP | | 2016 |
| Blakes Carpentry & Joinery Services Limited | Construction | 2003 |
| BLC Homes Ltd | Real estate | 2022 |
| Blenheim Ceramics Limited | Construction | 1999 |
| Bletchingley Golf Club Limited | Professional & scientific | 2004 |
| Blind Design (UK) Limited | Manufacturing | 2005 |
| Blmp Limited | Arts & recreation | 1995 |
| Blue Earth Management Limited | Professional & scientific | 2005 |
| Bluecoast Properties Limited | Real estate | 1999 |
| BM Autosport Limited | Wholesale & retail | 2006 |
| BNC Cleaning Services Limited | Professional & scientific | 1989 |
| BO Peep Limited | Hospitality | 2002 |
| Bodin and Nielsen Limited | Construction | 1986 |
| Boldfell Limited | Households | 1982 |
| Bolotti Limited | Information & communication | 2006 |
| Bondrand Limited | Professional & scientific | 1976 |
| Bonners Direct Limited | Professional & scientific | 1998 |
| Bonners Limited | Wholesale & retail | 1986 |
| Boojis Consulting Limited | Other services | 2019 |
| Books Alive | Wholesale & retail | 1999 |
| BOW Vehicles Ltd | Other services | 2026 |
| Bower Close (ST. Leonards-On-Sea) Residents Association Limited | Extraterritorial | 1987 |
| Brace Scaffolding Limited | Wholesale & retail | 1985 |
| Brackmount Films Ltd. | Arts & recreation | 1996 |
| Bradley Property Management Limited | Real estate | 2003 |
| Brainhire Consultants Ltd. | Other services | 1996 |
| Bramptons (Butchers) Limited | Wholesale & retail | 1995 |
| Bramway Building Services Limited | | 1988 |
| Brand Adventure Ltd | Professional & scientific | 2002 |
| Brand Inst Limited | Administrative & support | 2001 |
| Brand Passion Ltd | Wholesale & retail | 2005 |
| Braybrooke Road Residents Association Limited | Real estate | 2003 |
| Breakfast Zone Limited | Hospitality | 2019 |
| Breakfast Zone Two Ltd | Hospitality | 2025 |
| Breamwood Properties Limited | Real estate | 1995 |
| Breeze & Associates Ltd | Professional & scientific | 2003 |
| Brian Brookman Consulting Ltd | Professional & scientific | 2023 |
| Brian Huntly Builders Limited | Construction | 1999 |
| Brian Madge Limited | Administrative & support | 2002 |
| Bridgepointai Limited | Information & communication | 2025 |
| Brierly & Westella House Limited | Health & social care | 2003 |
| Brigden Barns Limited | Real estate | 2005 |
| Brightember Limited | Administrative & support | 2006 |
| Brightling Enterprises Limited | Administrative & support | 2007 |