| B Maya Ltd | Wholesale & retail | 2017 |
| B Minted Ltd | Wholesale & retail | 2021 |
| B ROY Health Care Limited | Health & social care | 2012 |
| B Squared Builders Ltd | Construction | 2024 |
| B Utility Ltd | Construction | 2018 |
| B&B Boutique Ltd | Wholesale & retail | 2017 |
| B&G Double Glazing Limited | Construction | 2019 |
| B&H Limo Buses Ltd | Transport & logistics | 2021 |
| B&I Tutoring Ltd | Education | 2019 |
| B&J Managements Ltd | Other services | 2020 |
| B&J Ventures Ltd | Health & social care | 2015 |
| B&O Beauty Services Limited | Information & communication | 2023 |
| B&T Line Ltd | Construction | 2011 |
| B&Ve Construction Ltd | Construction | 2021 |
| B-Square Grill Limited | Hospitality | 2020 |
| B.Atlas Construction Ltd | Construction | 2025 |
| B.Belz Limited | Construction | 2020 |
| B.Divarova Ltd | Health & social care | 2022 |
| B.E. Stannard Engineers Limited | Manufacturing | 1960 |
| B.E.S.M Limited | Construction | 2025 |
| B.J. Brown Business Machines Limited | Administrative & support | 1975 |
| B.R.A.I Limited | Manufacturing | 2022 |
| B4CARE Ltd | Health & social care | 2023 |
| B5 London Ltd | Hospitality | 2026 |
| B7 Construction Solutions Ltd | Construction | 2023 |
| BA Collins Electrical Limited | Construction | 2025 |
| BA Painters and Decorators Limited | Construction | 2023 |
| BA Traders Ltd | Construction | 2019 |
| Baaks Services Ltd | Administrative & support | 2018 |
| Baaop Ltd | Other services | 2022 |
| BAB Trading Limited | Construction | 2014 |
| BAB Transport Ltd | Transport & logistics | 2025 |
| Baba Barbers Ltd | Other services | 2021 |
| Babsco Travels Ltd | Wholesale & retail | 2017 |
| Babycutters Ltd | Wholesale & retail | 2022 |
| Babyprintahoy Ltd | Wholesale & retail | 2024 |
| BAC Events Limited | Hospitality | 2019 |
| BAC Group London Ltd | Hospitality | 2021 |
| BAC London Limited | Hospitality | 2019 |
| Bacha & SON Building Constructions Ltd | Construction | 2023 |
| Bacilar Limited | Hospitality | 2019 |
| BAD Boyz Barbers Ltd | Other services | 2025 |
| BAD Run Club Ltd | Wholesale & retail | 2026 |
| Badem Limited | Hospitality | 2026 |
| Badshah Scents Ltd | Wholesale & retail | 2024 |
| BAF Consultancy Ltd | Construction | 2016 |
| Baffour & Associates Ltd | Professional & scientific | 2012 |
| Baha' Design Ltd | Wholesale & retail | 2025 |
| Baileys Dog Grooming Ltd | Wholesale & retail | 2023 |
| BAJ Acquisitions Ltd | Real estate | 2023 |
| Baja Group Ltd | Construction | 2025 |
| Bajwa Group Dagenham Limited | Real estate | 2022 |
| BAK Ventures Ltd | Wholesale & retail | 2025 |
| Bakalov Builders Ltd | Construction | 2024 |
| Bakare & Co Ltd | Professional & scientific | 2011 |
| Bakedbynes Ltd | Manufacturing | 2020 |
| Bakers and Shakers Limited | Manufacturing | 2021 |
| Bakiou Construction Ltd | Construction | 2026 |
| Balaj Transport Ltd | Wholesale & retail | 2025 |
| Balfour Ventures Limited | Wholesale & retail | 2009 |
| Balkar Singh Ltd | Construction | 2021 |
| Balqis Motor Trader Ltd | Wholesale & retail | 2024 |
| Baltibrothers Limited | Administrative & support | 2022 |
| Bama Tech Ltd | Wholesale & retail | 2019 |
| Bambino City Ltd | Administrative & support | 2023 |
| Bameyola Solutions Limited | Information & communication | 2019 |
| Bami House UK Limited | Information & communication | 2018 |
| Bamron-Ajid Limited | Real estate | 2022 |
| Banafa Construction Ltd | Construction | 2020 |
| Band AB Company Limited | Health & social care | 2023 |
| Band of Joiners Ltd | Manufacturing | 2019 |
| Bangash and Sons Ltd Limited | Manufacturing | 2024 |
| Bani Packages Ltd | Administrative & support | 2023 |
| BAP Services Limited | Construction | 2019 |
| Bar B Q Tonight Limited | Hospitality | 2024 |
| Bar Cafe 222 Ltd | Other services | 2019 |
| Barakah JP Ltd | Real estate | 2023 |
| Barawani Ltd | Construction | 2023 |
| Barbell Brunch Club Limited | Other services | 2018 |
| Barbican Sushi K&T Ltd | Wholesale & retail | 2023 |
| Barcelona Funeral UK Ltd | Financial services | 2023 |
| Barcento Advisory Limited | Professional & scientific | 2025 |
| Bargain Furniture Ltd | Wholesale & retail | 2024 |
| Barhope LAB Services Ltd | Professional & scientific | 2015 |
| Bariolé Limited | Construction | 2022 |
| Barking & Brighton Legal Ltd | Professional & scientific | 2023 |
| Barking & Dagenham Citizens Advice Bureau | Information & communication | 1984 |
| Barking & Dagenham Trading Partnership Ltd | Professional & scientific | 2017 |
| Barking & Dagenham Youth Zone | Arts & recreation | 2016 |
| Barking Accountants Ltd | Professional & scientific | 2019 |
| Barking and Dagenham Chamber of Commerce Limited | Other services | 1995 |
| Barking Football Club (1980) Limited | Arts & recreation | 1980 |
| Barking Music and Drama | Other services | 2006 |
| Barkingit Limited | Information & communication | 2007 |
| BARKINGSPORTS4CHANGE C.I.C. | Education | 2024 |
| Barry Goodmans Ltd | Wholesale & retail | 2019 |
| Bartar Syndicate Ltd | Transport & logistics | 2024 |
| Bartcrown Limited | Manufacturing | 2004 |
| Barzah Ltd | Wholesale & retail | 2026 |
| Basbab Ltd | Wholesale & retail | 2026 |