| Bellamore Technology Limited | Professional & scientific | 2018 |
| Bellamore Technology Partners LLP | | 2018 |
| Bells of Canterbury Limited | Real estate | 1936 |
| Belly Bar Canterbury Ltd | Other services | 2022 |
| Bembom Ltd | Hospitality | 1999 |
| Ben-G Ltd | Wholesale & retail | 2012 |
| Benchmark Fibre Solutions Ltd | Construction | 2019 |
| Bennett Consulting Limited | Professional & scientific | 2021 |
| Bernard Barrett Associates Limited | Financial services | 1992 |
| Bertico Ltd | Information & communication | 2023 |
| Best for Interiors Limited | Wholesale & retail | 2019 |
| Best Price Windows and Doors Limited | Construction | 2026 |
| Best Web Studio Ltd | Manufacturing | 2019 |
| Best-In-Tents Ltd | Administrative & support | 2025 |
| Bethel Empire Ltd | Manufacturing | 2018 |
| Bethel Family International Ministry CIC | Other services | 2026 |
| Betteridge & Milsom Limited | Professional & scientific | 2005 |
| Betteshanger Country Park Limited | Arts & recreation | 2009 |
| Betteshanger Property Limited | Construction | 2019 |
| Betti Broom Ltd | Administrative & support | 2026 |
| Beverley Estate (Canterbury) Residents Association Limited | Households | 1964 |
| Beverley Estates Limited | Households | 2002 |
| Beverley Fisher Studios Ltd | Arts & recreation | 2024 |
| Bexley / Fountain Street Whitstable Tenant Controlled Management Company Ltd | Real estate | 2024 |
| Bexley Recycling Ltd | Water & waste | 2018 |
| Bfsi Solutions Limited | Professional & scientific | 2024 |
| Bgd&Partners Ltd | Transport & logistics | 2019 |
| BH Construction Kent Ltd | Construction | 2023 |
| BH Governance LLP | | 2022 |
| BH Payroll LLP | | 2022 |
| BH Tax LLP | | 2022 |
| BHC Scaffolding Services Ltd | Construction | 2025 |
| Bidco 1024 Limited | Construction | 2024 |
| Big Area Holdings Limited | Other services | 2020 |
| Big Boss Auction Ltd | Wholesale & retail | 2023 |
| Big Boys Pizza Ltd | Hospitality | 2018 |
| Big Chainring Ltd | Information & communication | 2018 |
| Big D Transport Ltd | Transport & logistics | 2026 |
| Big Idea Group Ltd | Administrative & support | 2015 |
| Bigmight Consulting Limited | Information & communication | 2026 |
| Bijc Limited | Professional & scientific | 2014 |
| Biketart Ltd | Wholesale & retail | 2008 |
| Binsulin Limited | Wholesale & retail | 2022 |
| BIO Vulcan Limited | Manufacturing | 2022 |
| Biocem Ltd | Wholesale & retail | 2025 |
| Biodemeter Limited | Agriculture & fishing | 2021 |
| Bioinformatics Solutions Ltd | Professional & scientific | 2024 |
| Bioteknik (South East) Limited | Wholesale & retail | 2015 |
| BIR Eylul Ltd | Hospitality | 2025 |
| Birchfray Limited | Wholesale & retail | 2018 |
| Birchington Catering Ltd | Hospitality | 2018 |
| Birdmouth Ltd. | Information & communication | 2024 |
| Birds Hill Investments Limited | Real estate | 1959 |
| Birnie Medical Limited | Health & social care | 2013 |
| Birugen Molecular Ltd | Information & communication | 2026 |
| Bishop Court Property Company Limited | Households | 1982 |
| Bitbrawn Ltd | Information & communication | 2021 |
| Bits & Pieces Theatre Limited | Arts & recreation | 2024 |
| Bizitel Limited | Information & communication | 2007 |
| BJK1903 Limited | Other services | 2019 |
| BJL Electrical & Property Services SE Limited | Administrative & support | 2024 |
| BJP Site Engineering Services Limited | Professional & scientific | 2008 |
| BK Heating and PLUMBING4U Ltd | Construction | 2022 |
| Bkk&M Thai Ltd | Hospitality | 2023 |
| Black Cat Contracting Ltd | Construction | 2010 |
| Black Cat Enterprises Limited | Hospitality | 1967 |
| Black Cat Trading GB Limited | Real estate | 1996 |
| Black Dog Financial Limited | Professional & scientific | 2026 |
| Black Horse Canterbury Ltd | Hospitality | 2015 |
| Blackbox Ecom Limited | Administrative & support | 2011 |
| Blackbox Solutions (UK) Limited | Wholesale & retail | 2002 |
| Blackline Capital Management Ltd | Administrative & support | 2025 |
| Blackthread Technologies Limited | Information & communication | 2024 |
| Bladez Ltd | Wholesale & retail | 2018 |
| Blah Blah LAB Limited | Information & communication | 2016 |
| Blake and Chandler Consulting Ltd | Professional & scientific | 2020 |
| Blakes Hair and Beauty Ltd | Other services | 2022 |
| Bland Family Freehold Limited | Real estate | 2023 |
| Blatch & Green Limited | Construction | 2003 |
| BLB Solutions Ltd | Administrative & support | 2025 |
| BLG Cargo Ltd | Transport & logistics | 2024 |
| BLG Construction Services Limited | Construction | 2024 |
| Blind Mice Film Ltd | Information & communication | 2023 |
| Bliss Growth Ltd | Professional & scientific | 2021 |
| Bliss Invest Ltd | Administrative & support | 2021 |
| Blitz Educational Academy Ltd | Education | 2021 |
| Block M Management Company Limited | Households | 2015 |
| Blok Design Group Limited | Professional & scientific | 2025 |
| Bloomstays Ltd | Real estate | 2019 |
| Blossom and Berry Ltd | Manufacturing | 2016 |
| Blossom Tree Early Education Ltd | Health & social care | 2025 |
| Blta Limited | Administrative & support | 2017 |
| Bludel Limited | Information & communication | 2015 |
| Blue CAN Communications Limited | Professional & scientific | 2023 |
| Blue Coffee Box Limited | Wholesale & retail | 2017 |
| Blue Grass UK Limited | Information & communication | 1999 |
| Blue Island Global Ltd | Information & communication | 2026 |
| Blue Mountain East Kent Cleaning Limited | Administrative & support | 2022 |
| Blue Robin Retail Limited | Wholesale & retail | 2026 |
| Blue Skyves Investments Ltd | Financial services | 2019 |