| BA Rental Limited | Administrative & support | 2012 |
| Ballistix Coatings Ltd | Wholesale & retail | 2024 |
| Ballistix Holdings (UK) Limited | Construction | 2025 |
| BAM Taxi Services Ltd | Transport & logistics | 2026 |
| Banger Bros Ltd | Professional & scientific | 2017 |
| Banger Brothers Ltd | Extraterritorial | 2019 |
| Bare and Beautiful Limited | Other services | 2021 |
| Barena London Ltd | Real estate | 2025 |
| Barista 999 Limited | Manufacturing | 2016 |
| Barry Frederick Pugh Ltd | Extraterritorial | 2025 |
| Barton Engineering & Export Limited | Manufacturing | 1964 |
| Barton Marine Equipment Limited | Manufacturing | 1986 |
| Barton Whitstable Co., Ltd. | Construction | 1992 |
| Bartons Yard Whitstable Management Company Limited | Real estate | 2014 |
| Battered Limited | Hospitality | 2026 |
| Baudroom Ltd | Professional & scientific | 2025 |
| Bausalah Ltd | Real estate | 2025 |
| Bay Flooring Cleaning Ltd | Administrative & support | 2026 |
| Bay Leaf Coffee House Ltd | Hospitality | 2017 |
| Bay View Apartments (Kent) Limited | Households | 2020 |
| Baytown Trading Limited | Administrative & support | 2011 |
| BB Commercial Management Limited | Professional & scientific | 2023 |
| BBR Sporting Limited | Arts & recreation | 2013 |
| BCC Digital Creative Ltd | Professional & scientific | 2023 |
| BCM Sandwich Ltd | Hospitality | 2024 |
| Bdpro Ltd | Information & communication | 2021 |
| BE Fulfilled Limited | Other services | 2022 |
| Beach HUT Consulting Ltd | Professional & scientific | 2022 |
| Beacon Associates (Kent) Limited | Administrative & support | 2022 |
| Beacon Beans Limited | Hospitality | 2024 |
| Beacon Heights Management Company Limited | Households | 2004 |
| Bears Ice Cream Company Limited | Hospitality | 2015 |
| Bears Towers Limited | Wholesale & retail | 2017 |
| Bearskin Holdings Ltd | Financial services | 2023 |
| Beatback Limited | Information & communication | 1995 |
| Beaumont James Ltd | Real estate | 2024 |
| Because Creative Ltd | Professional & scientific | 2018 |
| Becket Construction Ltd | Construction | 2018 |
| Bedsonline.Biz Limited | Wholesale & retail | 2005 |
| BEE & Butterfly Ltd | Real estate | 2025 |
| BEE Flower Ltd | Professional & scientific | 2020 |
| Beeches Homecare Kent Ltd | Health & social care | 2019 |
| Beehive Finance Ltd | Financial services | 2026 |
| Beehive Property Developments Ltd | Real estate | 2025 |
| Beeline Recruitment Limited | Administrative & support | 2017 |
| BEL Mezzo Limited | Professional & scientific | 2017 |
| Belmont Court (RBC) RTM Company Limited | Households | 2024 |
| Belvedere Azuga Limited | Real estate | 2025 |
| BEN Collins Building Ltd | Construction | 2019 |
| Bengarden Consulting Ltd | Professional & scientific | 2026 |
| Bennett Plumbing and Heating Ltd | Construction | 2019 |
| Bennett-Associates Ltd | Financial services | 2018 |
| Benosa Logistics Service Ltd | Construction | 2026 |
| Berg (UK) Limited | Wholesale & retail | 1996 |
| Bernie Bishop Limited | Construction | 2007 |
| Bettina Covac Language Services Ltd | Professional & scientific | 2016 |
| Beyond Boom Ltd | Professional & scientific | 2019 |
| Beyond Exceptional Engineering Group Limited | Professional & scientific | 2025 |
| Beyond OUR Dreams Limited | Administrative & support | 2023 |
| BG & Partners Ltd | Professional & scientific | 2016 |
| Bg&Partners Advisor Ltd | Professional & scientific | 2018 |
| BHR Marketing Ltd | Professional & scientific | 2021 |
| Biddenden Arboriculture Limited | Agriculture & fishing | 2022 |
| Biney Simpson Associates Limited | Professional & scientific | 2017 |
| Bishops Courtyard RTM Company Ltd | Households | 2008 |
| Bishops Holding(Sussex) Limited | Real estate | 2025 |
| Black Heart Limited | Information & communication | 2010 |
| Black Horse Marquees of Kent Limited | Administrative & support | 2018 |
| Blackburn Hall Property Limited | Real estate | 2023 |
| Blackburn Hall Services Ltd | Real estate | 2017 |
| Blackrock Architecture Ltd | Professional & scientific | 2012 |
| Blackrock Assessment Ltd | Professional & scientific | 2012 |
| Blandford IT Consultancy Ltd | Information & communication | 2020 |
| Blean Machine Hire Limited | Construction | 2005 |
| Blean PUB Co. Ltd | Administrative & support | 2025 |
| Blengate Marketing Limited | Professional & scientific | 2024 |
| Blink Architecture Limited | Professional & scientific | 2015 |
| Block a Residents Management Company Limited | Households | 2004 |
| Block B Residents Management Company Limited | Households | 2004 |
| Block C Residents Management Company Limited | Households | 2004 |
| Block D Residents Management Company Limited | Households | 2004 |
| Bloomsbury Productions Ltd | Administrative & support | 2017 |
| Blubelle Creative Ltd | Wholesale & retail | 2019 |
| Blue Hills Software Company Limited | Information & communication | 1998 |
| Blue Marble Education Ltd | Education | 2021 |
| Blue Market Media Limited | Professional & scientific | 2017 |
| Blue Nexus Ltd | Information & communication | 2023 |
| Blue Wolf Sports Group Ltd | Arts & recreation | 2025 |
| Bluebells & Blossoms Childminding Ltd | Health & social care | 2022 |
| Bluebells (Polegate) Management Company Limited | Households | 2011 |
| Bluebolt Recruitment Limited | Administrative & support | 2007 |
| Bluefield Mews Management Company Limited | Households | 2002 |
| Bluefish Consulting Limited | Information & communication | 2009 |
| Bluerkk Ltd | Other services | 2022 |
| Bluestone Aerospace Ltd | Manufacturing | 2022 |
| Blundells Properties Ltd | Real estate | 2003 |
| Blvnk Marketing Ltd | Professional & scientific | 2024 |
| BML Consultancy Limited | Professional & scientific | 2006 |
| Bodhi and FAE Ltd | Manufacturing | 2025 |
| Bogard Legal Services Limited | Professional & scientific | 2022 |