| Blackdown Consulting Ltd | Administrative & support | 2025 |
| Blackledge Pipework Services Limited | Construction | 1999 |
| Blades Hairdressers Limited | Other services | 2003 |
| Bladez Salon Limited | Other services | 2004 |
| Blain Pritchard Holdings Limited | Professional & scientific | 2007 |
| Blain Pritchard Limited | Professional & scientific | 1997 |
| Blain Pritchard Services Limited | Extraterritorial | 2002 |
| Blauw Research Limited | Professional & scientific | 2006 |
| Blazer International Limited | Information & communication | 2005 |
| Blazer Systems Limited | Extraterritorial | 2005 |
| Blizzard Records Limited | Information & communication | 2006 |
| Bloom Town Flowers Limited | Wholesale & retail | 2021 |
| Blossom Catering Limited | Hospitality | 2015 |
| BLU Care Facilities Ltd | Administrative & support | 2016 |
| Blue Anchor Lane Developments Limited | Construction | 2006 |
| Blue Flame GAS Services Limited | Administrative & support | 2002 |
| Blue Haze Management Co. Limited | Real estate | 1998 |
| Blue Investment Limited | Administrative & support | 2007 |
| Blue Laguna (UK) Limited | Wholesale & retail | 2021 |
| Blue Line Property Limited | Real estate | 2003 |
| Blue Shield Insurance Services Limited | Financial services | 1974 |
| Blue Stone Property Services Limited | Real estate | 1994 |
| Blueheath Cleaning Ltd | Administrative & support | 2016 |
| Bluestar Leisure Limited | Wholesale & retail | 2003 |
| Bluestone Property Management Limited | Real estate | 2019 |
| BMC Advisors UK Ltd | Professional & scientific | 2022 |
| Bmhc Enterprises Ltd | Wholesale & retail | 2021 |
| BMM Weston Holdings Limited | Professional & scientific | 1996 |
| BMM Weston International Limited | Manufacturing | 1978 |
| BMM Weston Limited | Manufacturing | 1959 |
| BMS Audio Visual Limited | Construction | 2008 |
| BN Sealy Limited | Professional & scientific | 2004 |
| BNQ Global Ltd | Real estate | 2005 |
| BNS Heating Spares Limited | Wholesale & retail | 2000 |
| Bntsb Limited | Construction | 2023 |
| BO Peep Restaurant Ltd | Hospitality | 2022 |
| BOB Luck Limited | Agriculture & fishing | 1958 |
| Bocelli Ltd | Hospitality | 2020 |
| Bodhicitta Ltd | Hospitality | 2021 |
| Bodhily Ltd | Financial services | 2021 |
| Bodhimanda Ltd | Other services | 2021 |
| Body & Wheels Workshop Ltd | Wholesale & retail | 2006 |
| Bodycheck Limited | Extraterritorial | 2000 |
| Boiler Health Care Limited | Other services | 1990 |
| Bokki Limited | Manufacturing | 2003 |
| Boloto Limited | Health & social care | 1997 |
| Bolton Elms Corporation Limited | Professional & scientific | 2005 |
| Bomag (Great Britain) Limited | Wholesale & retail | 1967 |
| BON Groundwork Limited | Construction | 1989 |
| BON VIN Inc. Limited | Wholesale & retail | 2001 |
| Bonanza Steak Houses (U K) Limited | | 1984 |
| Bond Sterling Limited | Administrative & support | 2022 |
| Bond Street Realty Limited | Real estate | 2024 |
| Bonneville Gardens Management Company Limited | Households | 1997 |
| Bonnington Installations Limited | Wholesale & retail | 2001 |
| Bonusresult Limited | Real estate | 1998 |
| Boormans Floors Limited | Professional & scientific | 2007 |
| Boost Factory Ltd | Wholesale & retail | 2013 |
| Bootsroad Limited | Professional & scientific | 2007 |
| Boreham Homes Limited | Construction | 2024 |
| Borough of Gravesend Conservative Club,Limited(The) | Hospitality | 1887 |
| Botten and Andrews Limited | Wholesale & retail | 2003 |
| Bourne Developments Limited | Construction | 1995 |
| Bower Marketing Limited | Professional & scientific | 1993 |
| Bowl Delight Ltd | Hospitality | 2025 |
| Bowles Well Gardens Estate Limited | Administrative & support | 1949 |
| Bowyer Pounds & Co Ltd | Professional & scientific | 2001 |
| Boxer Salvage Limited | Wholesale & retail | 2003 |
| Boys and Maughan Solicitors Ltd. | Extraterritorial | 2005 |
| Bppc Limited | Water & waste | 2006 |
| BPS Invested 2 Limited | Arts & recreation | 2023 |
| BPS Invested Limited | Arts & recreation | 2021 |
| BPSE19 Ltd | Real estate | 2025 |
| BR1 2BD Limited | Real estate | 2004 |
| BR3WERY Ltd | Manufacturing | 2017 |
| Bradstowe Investments Limited | Real estate | 1981 |
| Bradstowe Limited | Real estate | 2003 |
| Bramblecat Ltd | Information & communication | 2021 |
| Bramblings (Kent) Limited | Health & social care | 1990 |
| Branded Web-Sites Limited | Information & communication | 1998 |
| Branding Designs Limited | Professional & scientific | 2021 |
| Breakfast Computing Limited | Professional & scientific | 1990 |
| Brent Court Management Limited | Real estate | 1989 |
| Brewer's Shoe Repair Service Limited | Wholesale & retail | 1956 |
| Brians Plumbing and Heating Limited | Construction | 2002 |
| Bricars Limited | Wholesale & retail | 1996 |
| Brick BIF Limited | Real estate | 2020 |
| Brick Property Management Limited | Real estate | 2006 |
| Bridge the GAP Limited | Information & communication | 1993 |
| Bridgefield Court Management Company Limited | Professional & scientific | 1996 |
| Bridgers (Worthing) Limited | Wholesale & retail | 2002 |
| Brigade Electronics Group PLC | Wholesale & retail | 2009 |
| Bright Light Chinese Takeaway Limited | Hospitality | 2024 |
| Bright Light Films Ltd | Information & communication | 2005 |
| Brighton Boat Showrooms Limited | | 1985 |
| Brightspace Limited | Construction | 2004 |
| Brightway Ltd | Hospitality | 2004 |
| Brilema Limited | Real estate | 2001 |
| Brimstone Consulting Ltd | Other services | 2018 |
| Brissenden Trust Limited | Health & social care | 1967 |