| Balanced Body Clinic Ltd | Health & social care | 2014 |
| Balcao Ltd | Hospitality | 2023 |
| Baldev Pardhan Property Ltd | Real estate | 2025 |
| Balham Local Ltd | Wholesale & retail | 2026 |
| Balham Retail Investments Ltd | Real estate | 2025 |
| Balook Consulting Services Ltd | Professional & scientific | 2021 |
| Balosh Integrated Services Limited | Manufacturing | 2015 |
| Baltic Drive Ltd | Administrative & support | 2025 |
| Baltic Enterprises (UK) Limited | Wholesale & retail | 2003 |
| Balviashapura Enterprise Ltd | Financial services | 2024 |
| BAM - TW Ltd | Other services | 2020 |
| Bam-Gb Ltd | Other services | 2019 |
| Bambadi Ltd | Administrative & support | 2023 |
| Bambinos Montessori Nursery Ltd | Education | 2013 |
| Bancil Design and Build Ltd | Construction | 2026 |
| Bancil Property Consultants Ltd | Professional & scientific | 2024 |
| Bancil Property Management Limited | Other services | 2025 |
| Banco Agency Surveyors Ltd | Real estate | 2021 |
| Banco Surveyors Limited | Real estate | 2017 |
| Bani Enterprises UK Ltd | Wholesale & retail | 2024 |
| Bani Imperial Homes Ltd | Real estate | 2024 |
| Bani Overseas Ltd | Wholesale & retail | 2022 |
| Banjak Top CUT Ltd | Construction | 2015 |
| Bapanpall Ltd | Wholesale & retail | 2025 |
| Bar B QUE HUT Limited | Hospitality | 2014 |
| Bar Orlik Ltd | Hospitality | 2020 |
| BAR78 Limited | Administrative & support | 2022 |
| Baraka Sushi Limited | Hospitality | 2026 |
| Baraklan Adventures Ltd | Administrative & support | 2025 |
| Bare Necessities Worldwide | Other services | 2012 |
| Bargain Home Deals Ltd | Wholesale & retail | 2024 |
| Bargain Online Ltd | Wholesale & retail | 2012 |
| Bargain Trading Ltd | Wholesale & retail | 2025 |
| Barnes Fish Shop Limited | Wholesale & retail | 2005 |
| Barnes Hounslow Limited | Health & social care | 2018 |
| Barnstone Admin Ltd | Administrative & support | 2015 |
| Baron & Kroeger Limited | Professional & scientific | 2015 |
| Barrack Convenience Limited | Wholesale & retail | 2026 |
| Barrack Superstore Ltd | Real estate | 2010 |
| Barry Edmonds Photographic Services Ltd | Professional & scientific | 2022 |
| Barsa Traders Ltd | Wholesale & retail | 2019 |
| Bart Upholstery Ltd | Manufacturing | 2024 |
| Bartek Associates Ltd | Administrative & support | 2024 |
| Barvalo Ltd | Construction | 2024 |
| BAS Plus Construction Ltd | Construction | 2019 |
| Bashir's Real Estate Ltd | Real estate | 2014 |
| Basic & Beyond Ltd | Wholesale & retail | 2022 |
| Basingstoke UK Limited | Real estate | 2025 |
| Bask Camz Limited | Information & communication | 2025 |
| Basketrio Ltd | Wholesale & retail | 2024 |
| Bass Industries Ltd | Professional & scientific | 2026 |
| Basuri Events Limited | Professional & scientific | 2024 |
| BAT Catering Ltd | Hospitality | 2019 |
| Bath Road Holdings Limited | Real estate | 2004 |
| Bath Road Propco Limited | Real estate | 2022 |
| Bathroom Fitter Ealing Ltd | Construction | 2024 |
| Batra Properties Ltd | Real estate | 2020 |
| Battersea Operating Company Limited | Hospitality | 2020 |
| Battersea Property Holdings Limited | Professional & scientific | 2020 |
| Battersea Property Lease Limited | Professional & scientific | 2020 |
| Batth Apex Roofing Ltd | Construction | 2026 |
| Batth's Construction Ltd | Construction | 2023 |
| Baweja & Brother Ltd | Wholesale & retail | 2022 |
| Baweja & Daughters Ltd | Wholesale & retail | 2023 |
| Baweja & Sons Ltd | Wholesale & retail | 2018 |
| Baweja Group Ltd | Real estate | 2022 |
| Baweja Investments Ltd | Real estate | 2025 |
| Baweja Superstore Ltd | Wholesale & retail | 2025 |
| Bayleaves Tandoori Group Ltd | Hospitality | 2026 |
| Bayswater Medical Services Ltd | Health & social care | 2024 |
| Bazi Group Limited | Wholesale & retail | 2021 |
| Bazili & Construction Ltd | Construction | 2023 |
| Bazona Online Ltd | Wholesale & retail | 2020 |
| BB Children & Family Services Ltd. | Health & social care | 2021 |
| BB Landmark Developments Ltd | Real estate | 2019 |
| BB Roofing Merchants Limited | Construction | 2024 |
| Bbcarpentry Ltd | Construction | 2025 |
| BBM Online Ltd | Wholesale & retail | 2026 |
| Bbmg Foundation UK Ltd | Health & social care | 2026 |
| Bbnuk Limited | Transport & logistics | 2022 |
| BC Delivery Ltd | Transport & logistics | 2019 |
| BCL Building Supplies Ltd | Wholesale & retail | 2018 |
| BCL Enterprises Ltd | Real estate | 2017 |
| BCL Group Limited | Professional & scientific | 2017 |
| BCL Investment (Ealing) Ltd | Construction | 2018 |
| BCL Management & Consultancy Ltd | Construction | 2017 |
| BCL Management Peterborough Ltd | Construction | 2016 |
| BCL Management Services Limited | Households | 2024 |
| BCP Western International Limited | Wholesale & retail | 2024 |
| BCS Medical (Shackleton) Ltd | Administrative & support | 2008 |
| Bdhoof Ltd | Health & social care | 2022 |
| BDO Complete Cleaning Ltd | Administrative & support | 2018 |
| BDR Estate Limited | Real estate | 2026 |
| BDS Cargo Ltd | Transport & logistics | 2025 |
| BDS Homecare Ltd | Health & social care | 2024 |
| Bdsg Builders ( London) Ltd | Construction | 2023 |
| BE Beauty London Ltd | Wholesale & retail | 2022 |
| BE Excellence Ltd | Other services | 2017 |
| Be-Aglow Legal Services Ltd | Administrative & support | 2022 |
| Beacon Bathrooms Ltd | Construction | 2023 |