| Billy Mcquoid New Homes Ltd | Real estate | 2023 |
| Bilting Grange Limited | Agriculture & fishing | 2009 |
| Biodiversity International Limited | Professional & scientific | 1993 |
| Bionik Ltd | Transport & logistics | 2013 |
| Birch & Form Limited | Wholesale & retail | 2024 |
| Bishop Communications Ltd. | Professional & scientific | 2013 |
| BKR Property Investments Ltd | Real estate | 2019 |
| Black Anchor Coffee Company Ltd | Wholesale & retail | 2019 |
| Black Barn Investments Limited | Financial services | 2025 |
| Blackbox Homes Ltd | Construction | 2026 |
| Blackbox Project Management Limited | Construction | 2020 |
| Blackham Court Holdings Limited | Financial services | 2022 |
| Blackham Court Limited | Agriculture & fishing | 1991 |
| Blackham Ventures Limited | Professional & scientific | 2022 |
| Blechingley and Hathersham Estate Company | Real estate | 1951 |
| Blended Therapies Ltd | Health & social care | 2006 |
| Blok Investments Limited | Agriculture & fishing | 2020 |
| Blossom Healthcare Services Ltd | Administrative & support | 2019 |
| Blue Script Designs Ltd | Professional & scientific | 2025 |
| Blueprint: Film Ltd | Information & communication | 2007 |
| BMM Weston Holdings Two Limited | Professional & scientific | 2017 |
| Boatman Consultants Ltd | Hospitality | 2015 |
| Bognar Family Holdings Limited | Real estate | 2024 |
| Bollywood Brass Band LLP | | 2011 |
| Bombus Limited | Arts & recreation | 2002 |
| Bookkeepingfirst.Com Limited | Extraterritorial | 2010 |
| Boreland & Ludisi (UK) Ltd | Wholesale & retail | 2018 |
| Borrowdale Sales and Marketing Limited | Wholesale & retail | 2025 |
| Bossenden Holdings Limited | Financial services | 2021 |
| Boston Budd Developments Limited | Construction | 2025 |
| Boston Developments Limited | Construction | 2026 |
| Boswell Wholesale Limited | Wholesale & retail | 2025 |
| Botley Green Energy Centre Ltd | Energy | 2022 |
| Boughton Management Limited | Households | 2008 |
| Bourne and Bred Ltd | Other services | 2015 |
| Bowyer & Barr Ltd. | Information & communication | 2025 |
| Boxwood Design Consultants Limited | Professional & scientific | 2012 |
| Boysons Premium Ltd | Manufacturing | 2024 |
| Braeside Freehold Limited | Extraterritorial | 2024 |
| Braeside Freehold LS Ltd | Extraterritorial | 2025 |
| Bramford 2 Green Energy Centre Ltd | Energy | 2022 |
| Bramford Green Energy Centre Ltd | Energy | 2022 |
| Branch and Boom Limited | Construction | 2026 |
| Brand of Brotherz Limited | Wholesale & retail | 2024 |
| Branson Roofing Limited | Construction | 2022 |
| Brasted Farming Company Limited (the) | Real estate | 1974 |
| Brave Motion Limited | Information & communication | 2018 |
| Brenley Limited | Manufacturing | 2019 |
| Brewcrew Ltd | Manufacturing | 2025 |
| Brides and Belles Limited | Wholesale & retail | 2013 |
| Bridge Farm Enterprises Ltd | Agriculture & fishing | 2019 |
| Bright Dressage Limited | Agriculture & fishing | 2021 |
| Bright Livery Services Limited | Agriculture & fishing | 2019 |
| Brightburn Digital Ltd | Information & communication | 2020 |
| Brightlight Power Solutions Ltd | Construction | 2025 |
| Brightspace Properties Ltd | Real estate | 2018 |
| Brilliant British Producers Ltd | Information & communication | 2020 |
| Brissworks Ltd | Professional & scientific | 2025 |
| Broadoak Demolition Limited | Construction | 2022 |
| Brockenhurst Homes (the Spinney) Ltd | Construction | 2021 |
| Brogdale Collections | Agriculture & fishing | 2007 |
| Brogdale Craft Cider Limited | Manufacturing | 2017 |
| Bromley and Brown Ltd | Construction | 2017 |
| Brook Farms Limited | Agriculture & fishing | 1949 |
| Brother Cycles Limited | Wholesale & retail | 2015 |
| Browns Biltong Ltd | Manufacturing | 2022 |
| Bruce-Lockhart Farming Limited | Agriculture & fishing | 2011 |
| Brymore Two Management Company Limited | Real estate | 1982 |
| BSH Property Services Ltd | Construction | 2024 |
| Bsqrd Data Ltd | Professional & scientific | 2024 |
| Buckhurst Park Produce Limited | Wholesale & retail | 2022 |
| Buckhurst Park Shoot Limited | Arts & recreation | 2017 |
| Bugle Horn | Agriculture & fishing | 2019 |
| Build ME Mini Limited | Arts & recreation | 2019 |
| Bulldog Accounting Limited | Professional & scientific | 2017 |
| BURGESSF19 Limited | Wholesale & retail | 2023 |
| Burwell Green Energy Centre Ltd | Energy | 2022 |
| Bushell Construction Ltd | Construction | 2023 |
| Bushes Café Ltd | Hospitality | 2026 |
| Business Unboxed CIC | Administrative & support | 2025 |
| Butler Farms (Kent) Limited | Agriculture & fishing | 2019 |
| Butterfly Boutique Ltd | Wholesale & retail | 2010 |
| Butterstone Pet Boarding Ltd | Agriculture & fishing | 2011 |
| Buyersbusiness Limited | Administrative & support | 2003 |
| Buying Time Ltd | Professional & scientific | 2003 |
| Buzov Ltd | Transport & logistics | 2023 |
| Buzzard's EYE View Ltd | Information & communication | 2017 |
| Bygone Kent Limited | Manufacturing | 2013 |
| C Bushell (Developments) Limited | Construction | 2020 |
| C H Logistical Services Limited | Administrative & support | 2021 |
| C J Kitchens & Bathrooms Ltd | Construction | 2020 |
| C&F Delivery and Logistic Ltd | Financial services | 2021 |
| C.K. Bartlett & SON Limited | Hospitality | 1947 |
| Cairn Research Limited | Manufacturing | 1985 |
| Cairn Research Trustees Limited | Other services | 2021 |
| Calabria MIA (Faversham) Limited | Hospitality | 2026 |
| Calderon Property Limited | Real estate | 2001 |
| California Cravings Ltd | Hospitality | 2018 |
| California Girl Foods Ltd | Extraterritorial | 2012 |
| Calumma Ecological Services Ltd | Professional & scientific | 2007 |