| Bluestone Facilities Management Ltd | Construction | 2025 |
| Bluestone SEO Ltd | Professional & scientific | 2025 |
| Bluetableuk Limited | Information & communication | 2023 |
| Bluetrolley.Com Limited | Manufacturing | 2013 |
| Bluewater Growth Advisory Ltd | Professional & scientific | 2019 |
| Bluewu Industry Limited | Agriculture & fishing | 2021 |
| Blueyellowred Limited | Professional & scientific | 2009 |
| Blukaku Properties Limited | Real estate | 2021 |
| Blum Ocean Limited | Wholesale & retail | 2025 |
| Blumia Ltd | Wholesale & retail | 2024 |
| Blundells Court Management Company Limited | Households | 2004 |
| Blunt Salon Limited | Other services | 2022 |
| Bluprinter Ltd | Wholesale & retail | 2025 |
| Blurlight Ltd | Other services | 2025 |
| Blush Beauty and Training Academy Ltd | Other services | 2018 |
| Blush Hairdressing Limited | Other services | 2004 |
| Bluvabullz Limited | Agriculture & fishing | 2019 |
| Blvck Lvbel Clothing Ltd | Wholesale & retail | 2019 |
| Blwm Ltd | Hospitality | 2021 |
| Blwn Music Ltd | Wholesale & retail | 2025 |
| Blync Ltd | Other services | 2020 |
| Blyric Ltd | Wholesale & retail | 2025 |
| Blyth PUB Company Ltd | Hospitality | 2023 |
| Blythswood Consulting Ltd | Financial services | 2016 |
| BM Am&Fm Ltd | Information & communication | 2015 |
| BM Corporation Ltd | Other services | 2025 |
| BM Konzo Ltd | Health & social care | 2024 |
| BM Moon Group Ltd | Wholesale & retail | 2025 |
| BM Motors Limited | Wholesale & retail | 2025 |
| BM Mubeen ALI Ltd | Wholesale & retail | 2026 |
| BM Pixel Ltd | Information & communication | 2025 |
| BM Property Finance Ltd | Financial services | 2024 |
| BM Spia HD Limited | Wholesale & retail | 2025 |
| Bm&A UK Ltd | Extraterritorial | 2017 |
| BMA 3 Solutions Ltd | Wholesale & retail | 2024 |
| BMA Travels and Cargo Ltd | Transport & logistics | 2025 |
| Bmac Design & Developments Ltd | Professional & scientific | 2012 |
| BMD Select Ltd | Financial services | 2017 |
| BMF Servicing Limited | Manufacturing | 2020 |
| BMG Holding Ltd | Financial services | 2025 |
| BMI Care Limited | Health & social care | 2019 |
| Bmine Technologies Ltd | Wholesale & retail | 2022 |
| BMKOZLEM1 Ltd | Wholesale & retail | 2025 |
| Bmlive Ltd | Wholesale & retail | 2024 |
| BMM Group Limited | Wholesale & retail | 2025 |
| BMP Letting Ltd | Real estate | 2019 |
| BMQ Limited | Real estate | 2015 |
| BMR Contractors 2019 Limited | Professional & scientific | 2019 |
| Bmrng Pharma Limited | Health & social care | 2021 |
| BMS Photonics Limited | Professional & scientific | 2019 |
| BMT Automotive Ltd | Transport & logistics | 2020 |
| BN Accounting Ltd | Professional & scientific | 2021 |
| BNA Car Hire Ltd | Other services | 2011 |
| Bnan Groups Limited | Wholesale & retail | 2025 |
| BNB Vintage Ltd | Wholesale & retail | 2026 |
| Bnc-Transmission Co., Ltd | Administrative & support | 2021 |
| BNG One Ltd | Administrative & support | 2025 |
| BNK Contracts Ltd | Construction | 2015 |
| Bnkrz Music Limited | Arts & recreation | 2025 |
| Bnky Limited | Transport & logistics | 2018 |
| BNS Investment Property 001 Limited | Real estate | 2025 |
| BNS Real Estate Ltd | Real estate | 2022 |
| Bnsa Limited | Construction | 2019 |
| BNT Investments Ltd | Real estate | 2024 |
| Bnup Ltd | Wholesale & retail | 2021 |
| BO International Industrial (UK) Co., Limited | Administrative & support | 2019 |
| BO Properties Limited | Real estate | 2011 |
| BOA Vida Ltd | Wholesale & retail | 2015 |
| Board Secure Limited | Professional & scientific | 2018 |
| Boardroses Recruits Ltd | Administrative & support | 2022 |
| Boat Sea View Ltd | Construction | 2017 |
| Boatcation Limited | Arts & recreation | 2020 |
| Boateng & AYI Services Ltd | Transport & logistics | 2017 |
| Boatsmart Europe LLP | | 2025 |
| BOB Byrne Ltd | Wholesale & retail | 2025 |
| BOB Shop 19 Ltd | Wholesale & retail | 2024 |
| Boba Time Capitol Limited | Hospitality | 2025 |
| Boban Ltd | Professional & scientific | 2016 |
| Bobath Enterprises Limited | Hospitality | 2013 |
| Bobbi Brandz Ltd | Professional & scientific | 2025 |
| Bobby Freight Limited | Transport & logistics | 2020 |
| Bobcat Boxing Ltd | Wholesale & retail | 2024 |
| Bobcat PUB Company Limited | Hospitality | 2017 |
| Bobruthcare Ltd | Health & social care | 2026 |
| Bobymart Ltd | Wholesale & retail | 2025 |
| Boceci Ltd | Wholesale & retail | 2025 |
| Bochgoch Limited | Information & communication | 2005 |
| Bocko Transport Limited | Transport & logistics | 2017 |
| BOD Capital Limited | Professional & scientific | 2023 |
| BOD Studios Ltd | Arts & recreation | 2025 |
| Boddington Beauty Haus Ltd | Wholesale & retail | 2025 |
| Boddles Business Ltd | Wholesale & retail | 2025 |
| Bodegn Ltd | Wholesale & retail | 2024 |
| Bodi Studios Limited | Other services | 2024 |
| Bodrul Family Investments Ltd | Real estate | 2025 |
| Bodwenarth Plant Limited | Administrative & support | 1999 |
| Body Axis Ltd | Wholesale & retail | 2025 |
| Body Basix LLP | | 2025 |
| Body Code Ltd | Wholesale & retail | 2019 |
| Body Mass Bullies Ltd | Agriculture & fishing | 2019 |