| Babyvue Ltd | Health & social care | 2018 |
| Backstay Consulting Limited | Professional & scientific | 2015 |
| Bagheera Consulting Limited | Construction | 2014 |
| BAH Projects Ltd | Construction | 2014 |
| Bahamas International Music Festival Limited | Arts & recreation | 2025 |
| Bajaria Murray & Co Ltd | Professional & scientific | 2012 |
| Bajl Limited | Information & communication | 2015 |
| Bajramaj Limited | Construction | 2021 |
| Balarka Ltd | Wholesale & retail | 2023 |
| Balearic AV Ltd | Wholesale & retail | 2017 |
| Balkurious Services Limited | Real estate | 2017 |
| Balloonista Ltd | Wholesale & retail | 2016 |
| Bamakean Investments Limited | Financial services | 2016 |
| Bams IT Ltd | Information & communication | 2017 |
| Band London Limited | Professional & scientific | 2003 |
| Bandbox Limited | Professional & scientific | 1997 |
| Bandidos Stylist Barbers Ltd | Other services | 2021 |
| Bangsy Building Services Ltd | Construction | 2024 |
| Banrut Properties Ltd | Real estate | 2022 |
| Banthia Legal Services UK Limited | Information & communication | 2015 |
| BARANSU4H Ltd | Wholesale & retail | 2025 |
| Barb & DOR Brokers Ltd | Financial services | 2020 |
| Barbarossa TV Limited | Information & communication | 2016 |
| Barber Ersin Limited | Other services | 2024 |
| BARBER6 Limited | Other services | 2024 |
| Barblou Enterprises Limited | Hospitality | 2023 |
| Barbop Ltd | Professional & scientific | 2025 |
| Barco Contractors Ltd | Professional & scientific | 2011 |
| Barkway Investments Ltd | Real estate | 2026 |
| Barletta Ltd | Administrative & support | 2009 |
| Barrows Connected Store UK Limited | Professional & scientific | 2007 |
| Barus Homes Limited | Real estate | 2018 |
| BAS Dental Ltd | Health & social care | 2020 |
| Base Computer Services Ltd. | Information & communication | 1996 |
| Batch Baby Ltd | Hospitality | 2021 |
| Batch Goods Limited | Wholesale & retail | 2025 |
| Bates Motor Repairs Ltd | Wholesale & retail | 2021 |
| Bathroom World UK Limited | Wholesale & retail | 2009 |
| Battersea Land Limited | Real estate | 2008 |
| Bayanmaa Limited | Information & communication | 2016 |
| Baycroft Lettings Limited | Real estate | 2018 |
| Bayes & Sharpe Limited | Information & communication | 2023 |
| Bayfield Place Management Company Limited | Real estate | 2014 |
| Bazaar Bespoke Ltd | Construction | 2019 |
| BB Care and Training Services Ltd | Health & social care | 2018 |
| BB Kent House Limited | Real estate | 2025 |
| BB Purley Ltd | Other services | 2026 |
| BB TCR Ltd | Other services | 2026 |
| BBB Property Holdings Ltd | Households | 2018 |
| Bcja Consultancy Ltd | Professional & scientific | 2025 |
| BCS Consulting Limited | Information & communication | 2010 |
| BE Remus Ltd | Construction | 2015 |
| BE VIP Ltd | Other services | 2019 |
| Be-Berry Ltd | Wholesale & retail | 2020 |
| BEA and Nathan Limited | Health & social care | 2015 |
| Beach Building and Consultancy Limited | Professional & scientific | 2024 |
| Beach Walk Ltd | Hospitality | 2022 |
| Beachland Finest Limited | Manufacturing | 2025 |
| Beacon Financial Blueprint (BFB) Limited | Professional & scientific | 2020 |
| Beacon Gate (Management Co) Limited | Households | 1995 |
| Beacon-Socials Tech Limited | Information & communication | 2026 |
| Beacondent Holdings Limited | Health & social care | 2011 |
| Beacondent Limited | Health & social care | 2010 |
| Beaconsfield Training Limited | Education | 2012 |
| Beam Accounting Ltd | Professional & scientific | 2023 |
| Beam Reach Partners Ltd | Financial services | 2021 |
| Beamish Construction Limited | Professional & scientific | 2020 |
| Beanie Investments Limited | Other services | 2021 |
| Beanie Properties (London) Limited | Real estate | 2022 |
| Beap Restaurants Limited | Hospitality | 2006 |
| Bear Culture Partnership Limited | Administrative & support | 2024 |
| Beauden Trading Co Ltd | Extraterritorial | 2023 |
| Beautiful Nails 8 Limited | Other services | 2018 |
| Beautiful Secrets Day Spa Ltd | Other services | 2026 |
| Beautish-Yu Ltd | Other services | 2025 |
| Beautybyhadleyb Ltd | Other services | 2025 |
| Beautygenic Ltd | Wholesale & retail | 2015 |
| Beck Property Developments Ltd | Real estate | 2024 |
| Beckcare Limited | Health & social care | 2019 |
| Becktam Healthcare Services Ltd | Health & social care | 2013 |
| Beechwood Properties Limited | Construction | 1981 |
| Beef Encounter Limited | Manufacturing | 2025 |
| Beer Devotion Ltd | Wholesale & retail | 2026 |
| Beesley Heating & Plumbing Ltd | Construction | 2016 |
| Beetlebug Ltd | Professional & scientific | 2011 |
| BEGO62 Ltd | Other services | 2021 |
| Beijing Express Orpington Limited | Hospitality | 2024 |
| Belgrave Place Limited | Households | 2001 |
| Belize Media Limited | Professional & scientific | 2025 |
| Bell Lifts Ltd | Construction | 2009 |
| Bell Lomax Moreton Limited | Information & communication | 2012 |
| Bella Rose Bromley Limited | Other services | 2020 |
| Belle Comme Elle Ltd | Wholesale & retail | 2019 |
| Belle Mare Ltd | Real estate | 2016 |
| Bellegrove Ceramics PLC | Wholesale & retail | 1957 |
| Belles Florist Limited | Wholesale & retail | 2021 |
| Bells Enterprises Ltd | Professional & scientific | 2011 |
| Bellsway Property Limited | Real estate | 2017 |
| Bellyany Ltd | Wholesale & retail | 2026 |
| Belmont Heating Services Limited | Administrative & support | 2016 |