| Bavarian Holdings Ltd | Financial services | 2020 |
| Bawarro Ltd | Wholesale & retail | 2017 |
| Bawburgh Installations Limited | Construction | 2006 |
| Bawburgh Management Company Limited | Households | 2026 |
| Bawburgh Mill Residents Association Limited | Households | 1988 |
| Bawdsey Martello Close Management Company Limited | Households | 2021 |
| Baxter and Simpson Heritage Ltd | Wholesale & retail | 2021 |
| Bay Cafe (Canvey Island) Limited | Hospitality | 2020 |
| Baybridge Developments Ltd | Real estate | 2021 |
| Bayenthal Technology Services Ltd | Information & communication | 2004 |
| Bayfield Farms Limited | Agriculture & fishing | 2002 |
| Bayfield Films Limited | Professional & scientific | 2022 |
| Baylon Philips Financial Solutions Ltd | Financial services | 2017 |
| Baynham Consulting Associates Ltd | Professional & scientific | 2015 |
| Bayston Doctors Limited | Health & social care | 2013 |
| Baythom Ltd | Transport & logistics | 2020 |
| BB Cars and Commercials Limited | Wholesale & retail | 2025 |
| BB Finance Limited | Extraterritorial | 2005 |
| BB Home Deliveries Ltd | Transport & logistics | 2024 |
| BB Home Delivery Services Ltd | Transport & logistics | 2020 |
| BB Installations (NFK) Ltd | Construction | 2013 |
| BB Leicester Ltd | Hospitality | 2022 |
| BB Restaurants Ltd | Hospitality | 2021 |
| BB Risk Services Limited | Extraterritorial | 2011 |
| BB Sports Consulting Ltd | Professional & scientific | 2023 |
| BB Surveys Ltd | Construction | 2008 |
| BB Wellbeing Therapies Ltd | Other services | 2018 |
| BBA Digital Media Ltd | Professional & scientific | 2014 |
| BBA12080 Ltd | Hospitality | 2025 |
| BBB Al-Ahad Ltd | Real estate | 2025 |
| BBB Future Build Limited | Construction | 2022 |
| Bbdrc Limited | Real estate | 2018 |
| BBH Limited | Construction | 1992 |
| Bbitc Limited | Arts & recreation | 2017 |
| BBL Family Law Limited | Professional & scientific | 2013 |
| BBM Logistics Limited | Transport & logistics | 2023 |
| BBM Motor Services Ltd | Wholesale & retail | 2019 |
| BBM Trading Group Ltd | Other services | 2022 |
| Bbrm Services Limited | Professional & scientific | 2019 |
| BBT Construction Ltd | Construction | 2021 |
| BBX Clinic Ltd | Other services | 2026 |
| BBZ Car Services Ltd | Transport & logistics | 2019 |
| BC3 Limited | Administrative & support | 2018 |
| BCB Hairdressing Ltd | Other services | 2024 |
| BCG Property Management Limited | Construction | 2001 |
| Bchl Services Limited | Professional & scientific | 2023 |
| BCP Scaffolding Ltd | Construction | 2013 |
| Bcryder Ltd | Wholesale & retail | 2026 |
| BCS Worldwide (UK) Limited | Administrative & support | 2011 |
| BD Eatery Limited | Hospitality | 2018 |
| BD Groundworkers Ltd | Construction | 2018 |
| BD Property Services NR Ltd | Construction | 2024 |
| BDC Legal Services Ltd | Professional & scientific | 2021 |
| BDC Services Ltd | Manufacturing | 2003 |
| BDS Autoworx Ltd | Wholesale & retail | 2022 |
| BDW Aluminium Limited | Manufacturing | 2023 |
| BE - the Wellbeing Collective Ltd | Health & social care | 2025 |
| BE Bronzed Tanning Studio Ltd | Other services | 2024 |
| BE Kind Online Ltd | Financial services | 2021 |
| BE Properties NFK Ltd | Real estate | 2023 |
| BE Smart BE Found Ltd | Information & communication | 2021 |
| BE Yourself Marketing Ltd | Wholesale & retail | 2010 |
| Beach Chalets Ltd | Hospitality | 2022 |
| Beach Holdings Ltd | Extraterritorial | 2022 |
| Beach House (Devon) Limited | Hospitality | 2013 |
| Beach House Norfolk Ltd | Real estate | 2021 |
| Beach HUT Style Limited | Real estate | 2016 |
| Beachcard Limited | Real estate | 2001 |
| Beachflamingo Ltd | Wholesale & retail | 2011 |
| Beachfront Breaks Ltd | Hospitality | 2023 |
| Beachfront Solutions Ltd | Other services | 2020 |
| Beachmans Court Management Co. Ltd. | Real estate | 1986 |
| Beacon Drones Ltd | Professional & scientific | 2019 |
| Beacon East Limited | Education | 2007 |
| Beacon Finance Ltd | Administrative & support | 2015 |
| Beacon Group Interests Ltd | Financial services | 2023 |
| Beacon IT Ltd | Information & communication | 2016 |
| Beacon Lettings Ltd | Real estate | 2024 |
| Beacon Recruitment Solutions Ltd | Administrative & support | 2019 |
| Beaconsfield Management Association Limited | Households | 1991 |
| Beadle and Mcevoy Limited | Hospitality | 2019 |
| Beadle Property Care Ltd | Construction | 2002 |
| Beahome Limited | Real estate | 2026 |
| Beaming Lights Childcare Ltd | Health & social care | 2025 |
| Beams and Braces Limited | Construction | 2021 |
| Beams Foster Care and Family Services Limited | Health & social care | 2013 |
| Beams Group Ltd | Financial services | 2025 |
| Beams Supported Accommodation Ltd | Hospitality | 2025 |
| Bear and Bean Holdings Limited | Financial services | 2017 |
| Beardshaw Holdings Ltd | Financial services | 2020 |
| Bearingboys Ltd | Wholesale & retail | 2006 |
| Bearings Direct Ltd | Wholesale & retail | 2010 |
| Beast Mode Games Ltd | Arts & recreation | 2025 |
| Beastly Boxes Ltd | Administrative & support | 2024 |
| Beat (Formerly Eating Disorders Association) | Health & social care | 1989 |
| Beattie Consult and Build Limited | Construction | 2000 |
| Beattie Design Limited | Administrative & support | 2019 |
| Beattie Passive Norse Limited | Professional & scientific | 2013 |
| Beau Beauty & Hair Ltd | Other services | 2026 |
| Beau Norwich Limited | Other services | 2023 |