| Basis Football Coaching Sunderland Ltd | Education | 2023 |
| Bassett Cars Ltd | Wholesale & retail | 2019 |
| Basv Ltd | Real estate | 2024 |
| BAT360HAMPSHIRE Ltd | Education | 2026 |
| Bath Specsavers Hearcare Limited | Wholesale & retail | 2006 |
| Bath Specsavers Limited | Wholesale & retail | 1991 |
| Bath Visionplus Limited | Wholesale & retail | 1993 |
| Bathgate Specsavers Limited | Wholesale & retail | 2008 |
| Bathgate Visionplus Limited | Wholesale & retail | 2008 |
| Batley Specsavers Limited | Wholesale & retail | 2004 |
| Batt Sails Limited | Manufacturing | 2002 |
| Battinghubs CIC | Arts & recreation | 2024 |
| Batut 1 Limited | Real estate | 2021 |
| Batut 2 Limited | Real estate | 2021 |
| Batut 3 Limited | Real estate | 2021 |
| Batut Allied House Limited | Real estate | 2022 |
| Batut Chessington Limited | Real estate | 2021 |
| Bauer Consult Limited | Professional & scientific | 2026 |
| Baun & Co Naval Outfitters Ltd | Wholesale & retail | 2025 |
| Bay Bite Sushi Ltd | Wholesale & retail | 2025 |
| Bay DEC Ltd | Construction | 2015 |
| Bay Tree Day Nurseries Limited | Education | 2016 |
| Bayer Car Sales Ltd | Wholesale & retail | 2011 |
| Bayer Property Limited | Real estate | 2018 |
| Baytree Beauty Ltd | Other services | 2013 |
| BBQ Boss Waterlooville Ltd. | Hospitality | 2013 |
| Bbqurious Limited | Hospitality | 2025 |
| BBS Plant Hire Limited | Administrative & support | 2014 |
| Bcac Sales Ltd | Wholesale & retail | 2024 |
| BCT Group Holdings Ltd | Financial services | 2025 |
| BCT Services (South) Ltd | Construction | 2010 |
| Bctservicesplant(South) Ltd | Administrative & support | 2015 |
| BCV Services Ltd | Real estate | 2014 |
| BD Media Limited | Professional & scientific | 2022 |
| BD Ventilation Ltd | Construction | 2025 |
| Bd-C Incline Bidco Limited | Financial services | 2021 |
| Bd-C Incline Midco Limited | Financial services | 2021 |
| Bdao Property Ltd | Real estate | 2026 |
| BDB Engineering Limited | Administrative & support | 2011 |
| Bdbusind Dhsu Limited | Wholesale & retail | 2025 |
| BDM Tech Limited | Wholesale & retail | 1998 |
| BDS Alliance Property Ltd | Real estate | 2026 |
| BDS Consultancy Ltd | Information & communication | 2026 |
| Bdsouthcoast Ltd | Other services | 2017 |
| BE a Diamond Limited | Other services | 2018 |
| BEA Cars Ltd | Transport & logistics | 2020 |
| BEA Ltd | Arts & recreation | 2024 |
| BEA Studio Ltd | Arts & recreation | 2024 |
| Beachside Ltd | Real estate | 2026 |
| Beacon Bottom Management Company Limited | Households | 2022 |
| Beacon Trails C.I.C. | Education | 2025 |
| Beals Mortgage and Financial Services Limited | Financial services | 2012 |
| Beamer Industries Ltd | Professional & scientific | 2019 |
| Bear Kustom's Paintworks Ltd | Wholesale & retail | 2024 |
| Beardy MAN Van Conversions Ltd | Wholesale & retail | 2019 |
| Bearwood Specsavers Limited | Wholesale & retail | 2006 |
| Bearwood Visionplus Limited | Wholesale & retail | 2006 |
| Beats & Swing Limited | Arts & recreation | 2017 |
| Beatties Mechanical Contractors Limited | Construction | 2019 |
| Beau Tangles Limited | Other services | 2009 |
| Beau Visage (Lymington) Limited | Other services | 2011 |
| Beau Visage (Titchfield) Limited | Other services | 2011 |
| Beaubridge (UK) Limited | Financial services | 2014 |
| Beaubridge Energist LLP | | 2012 |
| Beaubridge Investments LLP | | 2011 |
| Beaubridge LLP | | 2005 |
| Beaubridge Make Homes 1 Limited | Construction | 2020 |
| Beaubridge SJW Limited | Real estate | 2015 |
| Beaubridge Swansea LLP | | 2020 |
| Beaufort View Limited | Health & social care | 2006 |
| Beaumax Productions Ltd | Information & communication | 2015 |
| Beaumont Leys Specsavers Limited | Wholesale & retail | 2009 |
| Beaumont Leys Visionplus Limited | Wholesale & retail | 2009 |
| Beauty Within by SAM Limited | Other services | 2025 |
| Beaven Limited | Construction | 2019 |
| Beccles Specsavers Limited | Wholesale & retail | 2018 |
| Beckton Specsavers Limited | Wholesale & retail | 2018 |
| Bedford Domiciliary Specsavers Limited | Wholesale & retail | 2022 |
| Bedford Geo-Surveys Limited | Professional & scientific | 2025 |
| Bedford Specsavers Hearcare Limited | Wholesale & retail | 2003 |
| Bedford Specsavers Limited | Wholesale & retail | 1989 |
| Bedford Visionplus Limited | Wholesale & retail | 1993 |
| Bedminster Specsavers Hearcare Limited | Wholesale & retail | 2005 |
| Bedminster Specsavers Limited | Wholesale & retail | 1999 |
| Bedminster Visionplus Limited | Wholesale & retail | 1999 |
| BEE Hunt Limited | Arts & recreation | 2022 |
| Bee-Released Counselling C.I.C. | Health & social care | 2019 |
| Beebu Telecom Limited | Information & communication | 2013 |
| Beechleigh Properties Ltd | Real estate | 2024 |
| Beeradiant Advanced Aesthetics Ltd | Health & social care | 2026 |
| Beest Automotive Limited | Wholesale & retail | 2025 |
| Being Best Ltd | Education | 2025 |
| Bekson Consulting Ltd | Professional & scientific | 2025 |
| Belcam Limited | Construction | 2019 |
| Belfry Court Management Company Limited | Hospitality | 2005 |
| Believe in Science Ltd | Hospitality | 2020 |
| Beling Medical Services Limited | Health & social care | 2019 |
| Bella Calabria Limited | Hospitality | 2019 |
| Bella Rose Hodgson Ltd | Households | 2025 |
| Bellamanda Investments Limited | Real estate | 1987 |