| Bargain Tiles & Bathrooms Limited | Construction | 2011 |
| Bargain Tiles Limited | Wholesale & retail | 2001 |
| Barking & Dagenham Collective CIC | Other services | 2026 |
| Barking and Dagenham Council for Voluntary Service | Other services | 1993 |
| Barking and Dagenham Giving | Health & social care | 2015 |
| Barking and Dagenham Homes Ltd | Other services | 2019 |
| Barking and Dagenham Reside Abbey Roding LLP | | 2015 |
| Barking and Dagenham Reside Limited | Real estate | 2011 |
| Barking and Dagenham Reside Regeneration Ltd | Real estate | 2015 |
| Barking B&B Hotel Limited | Hospitality | 2006 |
| Barking Best Food Ltd | Hospitality | 2023 |
| Barking Burgers Limited | Hospitality | 2026 |
| Barking Butchers Ltd | Wholesale & retail | 2022 |
| Barking Cafe Ltd | Wholesale & retail | 2021 |
| Barking Computers A1 Limited | Wholesale & retail | 2019 |
| Barking Cornershop Limited | Wholesale & retail | 2017 |
| Barking Cost Cutter Ltd | Wholesale & retail | 2023 |
| Barking Enterprise Centres Community Interest Company | Administrative & support | 2016 |
| Barking Fish Mongers Ltd | Wholesale & retail | 2021 |
| Barking Food Ltd | Wholesale & retail | 2025 |
| Barking Fresh Fruit & Grocery Store Ltd | Wholesale & retail | 2020 |
| Barking Fresh Fruits & VEG Limited | Wholesale & retail | 2024 |
| Barking Halal Meat Ltd | Wholesale & retail | 2017 |
| Barking Halal Meat Supplies Limited | Wholesale & retail | 2019 |
| Barking Hotel Limited | Hospitality | 2006 |
| Barking Maintenance Ltd | Construction | 2024 |
| Barking Media Limited | Information & communication | 2025 |
| Barking PUB Ltd | Hospitality | 2014 |
| Barking Riverside Community Development C.I.C. | Households | 2012 |
| Barking Riverside Dental Limited | Health & social care | 2024 |
| Barking Riverside Estates and Community C.I.C. | Real estate | 2023 |
| Barking Riverside Inspiring Community (Bric) CIC | Education | 2025 |
| Barking Roofing Specialists Ltd | Construction | 2026 |
| Barking Shopfronts Limited | Manufacturing | 1999 |
| Barking Supermarket Ltd | Wholesale & retail | 2018 |
| Barking Traders Limited | Information & communication | 2013 |
| Barking Wholesale Limited | Wholesale & retail | 1994 |
| Barkingside Town Barbers Limited | Other services | 2021 |
| Barmat Healthcare Limited | Health & social care | 2015 |
| Barnvale Engineering & Supply Company Limited | Manufacturing | 2000 |
| Barry Stewart & Sons Limited | Real estate | 1983 |
| Baryar International Ltd | Wholesale & retail | 2025 |
| Base Mechanical (UK) Ltd | Construction | 2015 |
| Bashar Consultancy Limited | Administrative & support | 2016 |
| Basic Ball Group Ltd | Arts & recreation | 2024 |
| Bask Homes Ltd | Real estate | 2019 |
| Bataru Construction Ltd | Construction | 2017 |
| Batem Limited | Real estate | 2019 |
| BAV Constructions Ltd | Construction | 2020 |
| Bavaas Ltd | Wholesale & retail | 2022 |
| Bavarian Winter Wonderland Limited | Professional & scientific | 2013 |
| Bayelsa Development & Investment Company Ltd | Financial services | 2013 |
| Baymartades Ltd | Health & social care | 2019 |
| BAZ AL Zafer Limited | Real estate | 2019 |
| Baza Retail Ltd | Wholesale & retail | 2006 |
| Baza Trade Ltd | Wholesale & retail | 2005 |
| BB Maintenance Ltd | Construction | 2017 |
| Bbeast Ltd | Arts & recreation | 2023 |
| BBJ Management Corporation Ltd | Other services | 2011 |
| BBL Transport Limited | Transport & logistics | 2025 |
| BBM Trading Plus Ltd | Wholesale & retail | 2016 |
| BDL Solutions Ltd | Transport & logistics | 2015 |
| Bdms Global Group Ltd | Administrative & support | 2022 |
| BE Crowned Ltd | Manufacturing | 2025 |
| BE First (Regeneration) Ltd. | Construction | 2017 |
| Beacon Consult (UK) Limited | Professional & scientific | 2014 |
| Beacumine' Limited | Wholesale & retail | 2022 |
| Beascot Limited | Health & social care | 2015 |
| Beascott Homes Limited | Real estate | 2026 |
| Beatrice Gold Ltd | Wholesale & retail | 2023 |
| Beats&Bytes Ltd | Information & communication | 2026 |
| Beauty@Eden Ltd | Arts & recreation | 2019 |
| Beautyosophy Limited | Wholesale & retail | 2023 |
| Beautyqueens Cosmetics (Barking) Limited | Wholesale & retail | 2005 |
| Beba Limited | Construction | 2013 |
| Bebek Baklava Ltd | Hospitality | 2021 |
| Bebitadinacord Ltd | Construction | 2024 |
| Bebja Property Investments Limited | Real estate | 2024 |
| BEC (L&W) Limited | Financial services | 2024 |
| BEC (London) Limited | Manufacturing | 2005 |
| Becky K. Enterprises Limited | Administrative & support | 2025 |
| Becky Mother & Child CIC | Education | 2020 |
| Bede Castle Ltd | Real estate | 2022 |
| Bedsclick Ltd | Wholesale & retail | 2023 |
| Bedwell & Heir Properties Limited | Real estate | 2026 |
| Bee-Longing Limited | Administrative & support | 2022 |
| Beebakess Limited | Manufacturing | 2025 |
| Beezee IT Limited | Information & communication | 2008 |
| Behular Ventures Limited | Health & social care | 2023 |
| Being & Becoming Clinic Ltd | Health & social care | 2025 |
| Beks Zone Limited | Hospitality | 2017 |
| Bela Lisboa Ltd | Hospitality | 2018 |
| Bela's Bakes Ltd | Manufacturing | 2024 |
| Belcon Construction Limited | Construction | 2024 |
| Belgin London Limited | Wholesale & retail | 2024 |
| Bella Catering Ltd | Manufacturing | 2020 |
| Bella Rapid Response Limited | Health & social care | 2014 |
| Bellauk Ltd | Wholesale & retail | 2021 |
| Bella’S Lash & Beauty Ltd | Other services | 2025 |
| Belleone Boutique Limited | Wholesale & retail | 2026 |