| BNM Builders Group Ltd | Financial services | 2024 |
| BNN Construction Ltd | Wholesale & retail | 2026 |
| BNR Convenience Store Ltd | Wholesale & retail | 2016 |
| Bnsl Investments Limited | Real estate | 2024 |
| Bo-Bar Ltd | Hospitality | 2022 |
| BO5 UK Limited | Manufacturing | 2011 |
| Board of Hijama Regulations Limited | Education | 2017 |
| Boat Rocker Ltd | Wholesale & retail | 2024 |
| BOB Construct Ltd | Other services | 2015 |
| BOB the Handyman Ltd | Construction | 2026 |
| Boba 786 Ltd | Hospitality | 2023 |
| Boba Tigers Barkingside Ltd | Hospitality | 2022 |
| Boba Tigers Bubble Tea Ltd | Hospitality | 2021 |
| Boba Tigers Limited | Hospitality | 2023 |
| Boba's Bricks Limited | Wholesale & retail | 2023 |
| Bobbin Olive Ltd | Wholesale & retail | 2019 |
| Bobby Formwork Ltd | Construction | 2016 |
| Bobby Music Limited | Health & social care | 2015 |
| Boboctrans Ltd | Manufacturing | 2026 |
| Bobric Ltd | Construction | 2023 |
| Bochev Ltd | Other services | 2013 |
| Bodas Construction Ltd | Construction | 2020 |
| Bodhimirror Ltd | Wholesale & retail | 2024 |
| Body and Brain Healing Solutions Ltd | Health & social care | 2026 |
| Body by Bisson Ltd | Arts & recreation | 2022 |
| Body Tools UK Ltd | Wholesale & retail | 2013 |
| Bodyshop Services (Romford RTA) Limited | Wholesale & retail | 2019 |
| BOE Hospitality Limited | Arts & recreation | 2026 |
| Bogdan Stefan Ltd | Construction | 2018 |
| Bogma Ltd | Wholesale & retail | 2026 |
| Bogra Motors UK Limited | Wholesale & retail | 2020 |
| Bogvip Construction Ltd | Construction | 2021 |
| Boil Tea Company Limited | Manufacturing | 2022 |
| Boiler Buddyuk Ltd | Construction | 2025 |
| Boiler Diagnostics Ltd | Construction | 2025 |
| Bokanta Limited | Administrative & support | 2019 |
| Boko 534 Ltd | Construction | 2024 |
| Bokofe Ltd | Wholesale & retail | 2022 |
| Bokth Limited | Construction | 2019 |
| Bola Abiloye Consulting Limited | Professional & scientific | 2011 |
| Bold Eyes Locum Ltd | Health & social care | 2023 |
| Bold Frame Build Ltd | Construction | 2024 |
| Boldmark Studio Ltd | Professional & scientific | 2026 |
| Bolek Trans Ltd | Transport & logistics | 2017 |
| Bollin Clinic Ltd | Health & social care | 2024 |
| Bolnu Limited | Information & communication | 2013 |
| Bolt and Bearing (London) Limited | Manufacturing | 1982 |
| Bolt Support Services Ltd | Administrative & support | 2024 |
| Bombae Kaurture Ltd | Wholesale & retail | 2024 |
| Bombay Clothes Limited | Wholesale & retail | 2025 |
| Bommagani Constructions Ltd | Construction | 2026 |
| BON Robotics Limited | Manufacturing | 2015 |
| Bonaci Ltd | Transport & logistics | 2018 |
| Bonavion Ltd | Transport & logistics | 2019 |
| Boncas Limited | Households | 2017 |
| Bond Facades Limited | Construction | 2025 |
| Bond Land Affordable Housing Limited | Real estate | 2024 |
| Bond Land Development Consultants Limited | Professional & scientific | 2024 |
| Bond Land Group Holdings Limited | Financial services | 2024 |
| Bond Land Investment Consultants Limited | Professional & scientific | 2024 |
| Bond Land Investment Management Limited | Professional & scientific | 2024 |
| Bond Remy Land Securities Limited | Administrative & support | 2022 |
| Bondchoc Ltd | Wholesale & retail | 2022 |
| Bongs Enterprise Ltd | Administrative & support | 2021 |
| Bonhouse Ltd | Real estate | 2023 |
| Bonifa Investments UK Ltd | Real estate | 2017 |
| Bonita Sunder Limited | Construction | 2024 |
| Bonmala Consulting Limited | Professional & scientific | 2025 |
| Bonum Cibus Ltd | Hospitality | 2018 |
| Book Your DOC Limited | Administrative & support | 2022 |
| Bookatasker Ltd | Construction | 2025 |
| Booking NEX Ltd | Transport & logistics | 2025 |
| Bookkeeping Buzz Ltd | Administrative & support | 2025 |
| Bookmygetaway Ltd | Administrative & support | 2024 |
| Booksmartservices Ltd | Professional & scientific | 2019 |
| Boom Security Services Ltd | Administrative & support | 2025 |
| Booner Enterprise Limited | Wholesale & retail | 2021 |
| Boorika Limited | Wholesale & retail | 2021 |
| Boostworks Engineering Ltd | Manufacturing | 2025 |
| Borders and Beyond Ltd | Administrative & support | 2025 |
| Borehamwood Catering Limited | Hospitality | 2013 |
| Borg Project Consulting Ltd | Professional & scientific | 2024 |
| Borg Projects Ltd | Professional & scientific | 2025 |
| Borough Food Ltd | Hospitality | 2025 |
| Borough Media Ltd | Professional & scientific | 2022 |
| Borough Records Ltd | Information & communication | 2025 |
| Borrow (UK) Limited | Financial services | 2014 |
| Borscuzama Limited | Construction | 2024 |
| BOS London Limited | Construction | 2020 |
| BOS Property and Investment Limited | Real estate | 2025 |
| Bose International Ltd | Wholesale & retail | 2024 |
| Boshoti Limited | Real estate | 2023 |
| Bosphorus (Gloucester) Ltd | Hospitality | 2018 |
| Boss Barbershop Limited | Other services | 2019 |
| Boss Beauty and Aesthetics Ltd | Other services | 2021 |
| Boss Kids Nurseries Limited | Health & social care | 2025 |
| Boss Lifestyles Limited | Real estate | 2022 |
| Boss Motorbikes Limited | Administrative & support | 2025 |
| Boss Spice Limited | Hospitality | 2024 |
| Bossdecor Ltd | Construction | 2024 |