| BAS Business Ltd | Construction | 2018 |
| Baseera Solutions Ltd | Information & communication | 2025 |
| Baseops Ltd | Information & communication | 2013 |
| Bash Property Investments Ltd | Real estate | 2025 |
| Bashan Trading Ltd | Wholesale & retail | 2022 |
| Basic Supplies Co Limited | Wholesale & retail | 2025 |
| Basics for Beauty Limited | Wholesale & retail | 2020 |
| Basim Distribuation Ltd | Other services | 2018 |
| Baskerville Advisory Limited | Administrative & support | 2025 |
| Bass & Toti Limited | Financial services | 2020 |
| Bass Kent Imaging Ltd | Professional & scientific | 2023 |
| Bastion Ventures Ltd | Information & communication | 2022 |
| Basul Ltd | Information & communication | 2010 |
| Batalia Limited | Wholesale & retail | 2024 |
| Bathspec Ltd | Wholesale & retail | 1999 |
| Batinkov Pictures Ltd | Information & communication | 2016 |
| Batish Properties Ltd | Real estate | 2025 |
| Batma Ltd | Health & social care | 2010 |
| Battersea Mart Ltd | Wholesale & retail | 2026 |
| Batth Contracts Limited | Construction | 2013 |
| Batth Homes Essex Ltd | Construction | 2023 |
| Batth Investment Essex Ltd | Real estate | 2023 |
| Batth Medicals Ltd | Health & social care | 2018 |
| Batth Properties Ltd | Real estate | 2018 |
| BAU Gold Enterprises Limited | Wholesale & retail | 2011 |
| BAV Scaffolding Ltd | Construction | 2016 |
| Bavarian Spare Parts Ltd | Wholesale & retail | 2020 |
| Bawani Investments Limited | Construction | 2024 |
| Baxco Services Limited | Administrative & support | 2018 |
| Bayada Tools Ltd | Real estate | 2022 |
| Baygrass Limited | Information & communication | 2024 |
| Bayhouse Properties Limited | Real estate | 2013 |
| Baynes Care UK Limited | Health & social care | 2022 |
| Bayrise Consulting Limited | Professional & scientific | 2025 |
| Bayt Investment Limited | Financial services | 2020 |
| BB Fireworks Ltd | Wholesale & retail | 2025 |
| BB Health Ltd | Health & social care | 2025 |
| BB Motors Solution Ltd | Wholesale & retail | 2023 |
| Bba(Uk) Limited | Education | 2025 |
| Bbfatima Cash and Carry Limited | Wholesale & retail | 2021 |
| Bbg's Estates Ltd | Real estate | 2023 |
| Bbg's Holdings Ltd | Financial services | 2022 |
| BBN Builders Ltd | Construction | 2017 |
| BC Brickwork & Plastering Ltd | Construction | 2015 |
| Bcartbw GB Ltd | Wholesale & retail | 2025 |
| BCC Cleaners Limited | Administrative & support | 2025 |
| BCL Groundworks Essex Limited | Construction | 2025 |
| Bcla Construction Ltd | Construction | 2015 |
| BCS Car Services Ltd | Wholesale & retail | 2026 |
| BD Connections Limited | Other services | 2022 |
| BD Construction Solutions Ltd | Professional & scientific | 2020 |
| Bdaj Holdings Limited | Real estate | 2023 |
| BDC @ Broadway Limited | Arts & recreation | 2014 |
| BDE Clearance Limited | Water & waste | 2023 |
| BDE Maintenance Ltd | Construction | 2025 |
| BDM Consultancy Services Limited | Professional & scientific | 2024 |
| BE BE JAN Ltd | Manufacturing | 2022 |
| BE Ceen Ltd | Professional & scientific | 2022 |
| BE Connected Coaching Limited | Administrative & support | 2022 |
| BE DO Have Productions Limited | Wholesale & retail | 2025 |
| BE YOU Beauty Room Ltd | Other services | 2025 |
| BEA Luxury Ltd | Wholesale & retail | 2025 |
| BEA Property Services Ltd | Construction | 2018 |
| Beacon Housing Solutions Limited | Real estate | 2025 |
| Beacon Support Services (Europe) LLP | | 2015 |
| Beamer Digital Ltd | Information & communication | 2024 |
| Beamont Estates Limited | Real estate | 2020 |
| Bear Consultancy Ltd | Professional & scientific | 2011 |
| Bear Creek Software UK Ltd | Information & communication | 2024 |
| Bear Power Construction Ltd | Construction | 2026 |
| Bear Time Watches Ltd | Wholesale & retail | 2025 |
| Bearings Structural Solutions Ltd | Construction | 2013 |
| Beast Health & Fitness Limited | Health & social care | 2019 |
| Beat Hearting Limited | Information & communication | 2014 |
| Beau KID Ltd | Wholesale & retail | 2017 |
| Beaumont Holdings Romford Ltd | Construction | 2023 |
| Beaute Limited | Wholesale & retail | 2014 |
| Beautifly Aesthetics Ltd | Other services | 2024 |
| Beautifly Salon & Spa Ltd | Other services | 2021 |
| Beautiful Surprise Services Ltd | Wholesale & retail | 2023 |
| Beauty Aesthetics Clinic Ltd | Health & social care | 2021 |
| Beauty and Tanning by Sisters Ltd | Other services | 2025 |
| Beauty Angels Spa Ltd | Other services | 2018 |
| Beauty Bar by Chelsea Ltd | Other services | 2025 |
| Beauty Boss Method Ltd | Professional & scientific | 2025 |
| Beauty by Farah Ltd | Wholesale & retail | 2024 |
| Beauty by K Cosmetics Ltd | Administrative & support | 2018 |
| Beauty by Polka Ltd | Wholesale & retail | 2025 |
| Beauty Empire Limited | Real estate | 2021 |
| Beauty Face UK Ltd | Wholesale & retail | 2016 |
| Beauty Forever London Limited | Wholesale & retail | 2019 |
| Beauty FOX Studio Ltd | Other services | 2019 |
| Beauty Healthcare Ltd | Wholesale & retail | 2018 |
| Beauty Perfect Limited | Other services | 2018 |
| Beauty Trendz Limited | Other services | 2003 |
| Beauty World (Romford) Ltd | Wholesale & retail | 2025 |
| Beauty-X Ltd | Other services | 2023 |
| Beautyco Limited | Other services | 2024 |
| Beautyhome Limited | Health & social care | 2024 |
| Beautyless Ltd | Wholesale & retail | 2025 |