| Berkhamsted Home Improvements Ltd | Construction | 2022 |
| Berkhamsted Interims Limited | Professional & scientific | 2015 |
| Berkhamsted Luxury Homes Limited | Real estate | 2026 |
| Berkhamsted Osteopaths Limited | Health & social care | 2014 |
| Berkhamsted Powder Coating Limited | Wholesale & retail | 2026 |
| Berkhamsted Scaffolding Ltd | Construction | 2021 |
| Berkhamsted Schools Group | Education | 1959 |
| Berkhamsted Schools International Limited | Education | 2016 |
| Berkhamsted Sports Ground Charitable Association Limited | Arts & recreation | 1924 |
| Berkhamsted Tennis & Fitness Ltd | Professional & scientific | 2020 |
| Berkhamsted Together CIC | Hospitality | 2026 |
| Berkhamsted Toiletries Ltd | Manufacturing | 2023 |
| Berkley Court (Berkhamsted) Management Company Limited | Households | 1976 |
| Berko Box Ltd | Arts & recreation | 2023 |
| Berko TMR Burger Ltd | Hospitality | 2023 |
| Bespoke Sign Solutions Ltd | Manufacturing | 2017 |
| Best Results Fitness Ltd | Arts & recreation | 2019 |
| Beth Clements Consulting Ltd | Professional & scientific | 2013 |
| Beth Samuel Homes (Wood Green) Ltd | Construction | 2018 |
| Beth Samuel Property Finance Limited | Financial services | 2016 |
| Beyond Media Communications Limited | Professional & scientific | 2009 |
| Beyondtheschoolrun Ltd | Information & communication | 2004 |
| BF Consultancy Ltd | Professional & scientific | 2011 |
| BH Property Consulting Ltd | Real estate | 2025 |
| Bhhhc (Trading) Limited | Arts & recreation | 2018 |
| Biddle Consulting Limited | Hospitality | 2004 |
| Big Circus Films Limited | Information & communication | 2022 |
| Big Circus Media Ltd | Information & communication | 2020 |
| Bill Watts Building Innovation Ltd | Professional & scientific | 2009 |
| Bina Holding Ltd | Financial services | 2024 |
| Binks Ltd | Construction | 2021 |
| Biped Pictures Limited | Information & communication | 2006 |
| Birch and Burrow Ltd | Wholesale & retail | 2026 |
| Birch Strategic Solutions Ltd | Professional & scientific | 2015 |
| Birtchnell Consulting Limited | Professional & scientific | 2018 |
| Bison Technology Ltd | Information & communication | 2010 |
| Bitwiseowl Limited | Information & communication | 2015 |
| BK Civil Engineering Limited | Construction | 2019 |
| Blackbell UK Ltd | Information & communication | 2013 |
| Blackbird GEN AI Ltd | Professional & scientific | 2025 |
| Blackbird Holding Group Limited | Information & communication | 2024 |
| Blackfish Data Limited | Information & communication | 2022 |
| Blackgrass House Ltd | Real estate | 2024 |
| Blaiselester Ltd | Information & communication | 2025 |
| Blaze Commercial Limited | Construction | 2002 |
| Blighty Construction Limited | Construction | 2021 |
| Bloc Recruitment Ltd | Administrative & support | 2021 |
| Blockley LLP | | 2014 |
| Blokbabe Ltd | Wholesale & retail | 2025 |
| Bloxi Ltd | Construction | 2024 |
| Blue Castle Logistics Limited | Wholesale & retail | 2010 |
| Blue Elephant Consultancy Ltd | Professional & scientific | 2026 |
| Blue Mole Limited | Administrative & support | 2010 |
| Blue Ocean Analytics Limited | Information & communication | 2007 |
| Blue Rocket Consulting Limited | Information & communication | 2016 |
| Blue Sky Open Ltd | Information & communication | 2008 |
| Blue Square Contracts Ltd | Construction | 2018 |
| Blue Squirrel Asset Management Limited | Financial services | 2025 |
| Blue Train Property Limited | Real estate | 2006 |
| Blue Whippet Ltd | Information & communication | 2025 |
| Bluebean Limited | Extraterritorial | 2002 |
| Bluedime Properties Ltd | Real estate | 2024 |
| Bluegrove Ltd | Professional & scientific | 2025 |
| Bluesky Business Aviation News Ltd. | Information & communication | 2012 |
| BMK Property Limited | Real estate | 2011 |
| Boda Bros Ltd | Construction | 2025 |
| BON Soiree Ltd | Hospitality | 2002 |
| Boneyowen Ltd | Administrative & support | 2015 |
| Boom Event Planners Ltd | Other services | 2019 |
| Boom Software Ltd | Information & communication | 2020 |
| Boomerang Office Supplies Ltd. | Wholesale & retail | 1984 |
| Boost Tutoring Limited | Education | 2017 |
| Boro Trans Coaches Limited | Transport & logistics | 2024 |
| Botanics International Limited | Wholesale & retail | 2009 |
| Boundary Consulting & Production Limited | Professional & scientific | 2015 |
| Boundbridge Property Limited | Real estate | 2015 |
| Bovingdon Aviation Limited | Education | 2017 |
| Bowhill Management Group Limited | Financial services | 2026 |
| Bowhill Recruitment Ltd | Administrative & support | 2025 |
| Boxfish Films Ltd | Information & communication | 2007 |
| Bradtoni Ltd | Other services | 2026 |
| Brainai Ltd | Information & communication | 2025 |
| Brainchild Entertainment UK Limited | Information & communication | 2026 |
| Brainwood Films Limited | Information & communication | 2015 |
| Bramcote Bromeholme Estates Limited | Construction | 2002 |
| Brash Solutions Limited | Professional & scientific | 2001 |
| Bravo Mike Echo Ltd | Construction | 2023 |
| Bravon Ltd | Professional & scientific | 2022 |
| Bretts Legis Limited | Professional & scientific | 2016 |
| Brides of Berkhamsted Limited | Wholesale & retail | 2017 |
| Bridgingfi PLC | Financial services | 2026 |
| Bristol Laboratories Limited | Manufacturing | 1997 |
| Brit Ponds Group Ltd | Professional & scientific | 2025 |
| British Ponds LLP | | 2021 |
| Bro@Dnet Systems & Solutions Limited | Information & communication | 2002 |
| Broadwater Management Company Limited | Real estate | 1984 |
| Brooklyn Recruitment Limited | Administrative & support | 2015 |
| Brothers Consultancy Limited | Professional & scientific | 2025 |
| Broughton House Daycare Ltd | Education | 2018 |
| Brown NOT Green Chesham Ltd | Other services | 2017 |