| Bahra Property Ltd | Real estate | 2023 |
| Bahri Limited | Transport & logistics | 2017 |
| Bailey London Limited | Professional & scientific | 2018 |
| Baileys Waltham Limited | Professional & scientific | 2023 |
| Baiqbal Ltd | Wholesale & retail | 2026 |
| Baird and Lane Limited | Real estate | 1971 |
| Baisel Care Limited | Health & social care | 2020 |
| Bajaria Capital Investments Limited | Financial services | 2018 |
| Bajaria Group Limited | Financial services | 2018 |
| Bajaria Property Investments Limited | Real estate | 2018 |
| Bajrami Logistics Limited | Transport & logistics | 2024 |
| Bake (Chinatown) Limited | Hospitality | 2015 |
| Bake House (London) Ltd | Manufacturing | 2024 |
| Bake ME UP Ltd | Extraterritorial | 2022 |
| Baker and Smith Co. Limited | Other services | 2015 |
| Baker Morris Accountants Limited | Professional & scientific | 2020 |
| Baker Morris Consulting Limited | Information & communication | 2015 |
| Baker Search Ltd | Administrative & support | 2022 |
| Baker Street Optical Limited | Wholesale & retail | 2022 |
| Bakery Factory Limited | Hospitality | 2025 |
| Bakhai Properties Ltd | Real estate | 2021 |
| Bala Infotech Limited | Information & communication | 2011 |
| Balaci Civils Ltd | Construction | 2022 |
| Balagan Productions Ltd | Information & communication | 2014 |
| Balaji (Leics) Ltd | Health & social care | 2021 |
| Balaji Consultancy Services Limited | Professional & scientific | 2023 |
| Balaji Foods Limited | Manufacturing | 2010 |
| Balance Consultancy Limited | Professional & scientific | 2013 |
| Balanced Waves Limited | Manufacturing | 2016 |
| Balanced: Psychology Services Ltd | Health & social care | 2025 |
| Baldan Group UK Limited | Wholesale & retail | 2015 |
| Balgopal Ltd | Wholesale & retail | 2026 |
| Bali Heating & Plumbing Ltd | Construction | 2015 |
| Bali Houses Ltd | Real estate | 2022 |
| Balkh Kenton Ltd | Hospitality | 2019 |
| Balkh Restaurant Ltd | Hospitality | 2021 |
| Ball & Ball Consulting Ltd | Professional & scientific | 2021 |
| Ballina Management Services Limited | Professional & scientific | 2019 |
| Ballo's Hair & Beauty Limited | Other services | 2006 |
| Ballymill Industrial Ltd | Real estate | 2025 |
| Balmoral Court 20 Queens Terrace Residents Company Limited | Households | 1990 |
| Balmoral Diamonds Limited | Wholesale & retail | 2013 |
| Balmoral Place (Wembley Park) Management Limited | Households | 1980 |
| Balmoral UK Developments Limited | Real estate | 2018 |
| Balpt (Ilford) Limited | Real estate | 2007 |
| Balsv Limited | Information & communication | 2016 |
| Baltas Gandras Property Limited | Real estate | 2025 |
| Balti HUT Restaurant Limited | Hospitality | 2020 |
| Balti Property Services Limited | Construction | 2022 |
| Baltic CAM UK Ltd | Wholesale & retail | 2023 |
| BAM Collective Ltd | Information & communication | 2023 |
| Bambi Catering Ltd | Hospitality | 2026 |
| Bambi Events Ltd | Hospitality | 2026 |
| Bambinaia Holdings Ltd | Administrative & support | 2024 |
| Bambino Foods Ltd | Hospitality | 2017 |
| Bamboo House Ltd | Hospitality | 2016 |
| Bampton Property Ltd | Construction | 2024 |
| Banana Bricks Limited | Households | 2017 |
| Banana Cult Production UK Ltd | Professional & scientific | 2026 |
| Banani Family Limited | Hospitality | 2025 |
| Banaras Limited | Real estate | 2013 |
| Banaras Residential Ltd | Real estate | 2024 |
| Band of Gold Productions Limited | Arts & recreation | 2019 |
| Bandali Property Ltd | Real estate | 2021 |
| Bandali Trading Ltd | Other services | 2025 |
| Bandcraft Limited | Real estate | 2003 |
| Baneco Group Limited | Manufacturing | 2024 |
| Banerjee & ROY Healthcare Limited | Health & social care | 2017 |
| Bangalore Felixstowe Ltd | Hospitality | 2025 |
| Bangalore Fulham Limited | Hospitality | 2023 |
| Bangar Electrical Contractor Limited | Other services | 2009 |
| Bangerz N Mash Limited | Extraterritorial | 2018 |
| Bangladeshi Curry Limited | Hospitality | 2022 |
| Bani Associates Limited | Financial services | 1992 |
| Bani Hashim Holdings Limited | Financial services | 2024 |
| Banitec Limited | Information & communication | 2022 |
| Banjary Trading Ltd | Wholesale & retail | 2025 |
| Bank House Care Homes Holdings Limited | Financial services | 2021 |
| Bank House Care Homes Limited | Health & social care | 2003 |
| Bankole Care Limited | Health & social care | 2013 |
| Banner I.T. Limited | Information & communication | 2007 |
| Banner Infotech Limited | Administrative & support | 2019 |
| Bansal Aesthetic Smiles Ltd | Health & social care | 2022 |
| Bansal Grand Estates Ltd | Real estate | 2025 |
| Bansri Grocery Shop Limited | Wholesale & retail | 2026 |
| Bantel Medical Limited | Health & social care | 2021 |
| Banyan Supply Chain Solutions Limited | Professional & scientific | 2020 |
| Banyan Tree Foods LLP | | 2016 |
| Banzai UK Limited | Manufacturing | 2007 |
| Bapas Security Services Ltd | Administrative & support | 2018 |
| Bar Builders Ltd | Construction | 2021 |
| Bar Construction Ltd | Construction | 2018 |
| Baradini Logistics Ltd | Transport & logistics | 2025 |
| Barai Estate Holdings Limited | Professional & scientific | 2013 |
| Barai Limited | Real estate | 2000 |
| Baraka Market Limited | Wholesale & retail | 2026 |
| Barakah Jobs Ltd | Information & communication | 2021 |
| Barakat Cars Ltd | Transport & logistics | 2026 |
| Barash LEE Properties Limited | Real estate | 2017 |
| Barber Building Solutions Ltd | Construction | 2015 |