| Axzchip (UK) Electronic Technology Co., Ltd | Wholesale & retail | 2022 |
| AYA Import & Export Co., Ltd | Wholesale & retail | 2020 |
| Ayla Cafe Ltd | Hospitality | 2024 |
| Ayni Collective Ltd | Wholesale & retail | 2026 |
| Aynt Limited | Real estate | 2019 |
| Ayre Communications Limited | Administrative & support | 2010 |
| Ayshin Limited | Wholesale & retail | 2007 |
| Aysu International Trading Co., Limited | Extraterritorial | 2023 |
| Azalea Supported Living Ltd | Health & social care | 2026 |
| Aziz Management Company Limited | Administrative & support | 2008 |
| Aziz Medical Limited | Health & social care | 2002 |
| Aztechy Power Technology Co., Ltd | Extraterritorial | 2015 |
| Azura Apparel Ltd | Wholesale & retail | 2020 |
| AZZ Holdings Ltd | Real estate | 2024 |
| B & a General Construction Ltd | Construction | 2018 |
| B & Co Holdings Ltd | Real estate | 2024 |
| B Brand Audio Co., Ltd | Wholesale & retail | 2023 |
| B of London Limited | Wholesale & retail | 2021 |
| B&B Beckenham Limited | Real estate | 2022 |
| B&B Double Glaziers Ltd | Construction | 2021 |
| B&B SWP Ltd | Professional & scientific | 2025 |
| B&G International (FAR East) Limited | Extraterritorial | 2011 |
| B&I Global Trading Co., Ltd | Extraterritorial | 2023 |
| B&J International Co., Ltd | Wholesale & retail | 2015 |
| B.S.Glass Co., Ltd | Extraterritorial | 2016 |
| BA Electrics Limited | Manufacturing | 2023 |
| Baboas Group Limited | Extraterritorial | 2018 |
| Babraham Wellness (UK) Ltd. | Wholesale & retail | 2025 |
| Babysolo Scooter Ltd | Manufacturing | 2023 |
| Back to Back Events Limited | Arts & recreation | 2014 |
| Back to Life Coaching Ltd | Administrative & support | 2023 |
| Backing Stone Limited | Wholesale & retail | 2025 |
| BAE Geso Systems Ltd. | Manufacturing | 2021 |
| Bagland Ltd | Extraterritorial | 2015 |
| Bahf Ltd | Professional & scientific | 2021 |
| BAI Mengyao Group Limited | Manufacturing | 2025 |
| BAI TE Import and Export Ltd | Extraterritorial | 2019 |
| Baieluo Yuandong Interntional Group Ltd | Extraterritorial | 2020 |
| Baihe Marine Service Co., Ltd | Extraterritorial | 2021 |
| Bailanshi (UK) Ltd | Extraterritorial | 2020 |
| Bailey Building and Construction Limited | Real estate | 2006 |
| Bailgate Properties Limited | Real estate | 2023 |
| Baird Metals Limited | Extraterritorial | 2015 |
| Baishun Hardware Co., Ltd | Extraterritorial | 2017 |
| Bakeaway London Ltd | Hospitality | 2023 |
| Baker & Baker Medical Consultancy Ltd | Health & social care | 2017 |
| Baker Industrial Co., Ltd | Manufacturing | 2023 |
| Baldon Vision C.I.C. | Education | 2024 |
| Balham Developments South East Limited | Construction | 2016 |
| Balham Mansions Limited | Other services | 2016 |
| Ballead Industries Co., Ltd | Extraterritorial | 2015 |
| Ballya International Limited | Manufacturing | 2012 |
| Ballybrew Homes Limited | Real estate | 2022 |
| Ballyglen Ltd | Construction | 2012 |
| Balrath Properties Ltd | Real estate | 2025 |
| Bance Investments Limited | Real estate | 2026 |
| Bandeli Limited | Information & communication | 2023 |
| Banfield Acquisitions Limited | Arts & recreation | 2022 |
| Bangson International Co., Limited | Manufacturing | 2021 |
| Banner (Kemerton Road) Management Company Limited | Households | 2009 |
| Banner (Kemerton) Management Company Limited | Households | 2011 |
| Bansda Industrial Ltd | Extraterritorial | 2024 |
| Banva Studio Ltd | Professional & scientific | 2024 |
| BAO HUI FA Steel Intl Trade Co., Ltd | Extraterritorial | 2024 |
| BAO Run Feng Intl Trade Co., Ltd | Extraterritorial | 2023 |
| Baoding Eternity Import & Export Co., Ltd. | Manufacturing | 2023 |
| Baogang (Shandong) Iron and Steel Co., Ltd | Extraterritorial | 2022 |
| Baoodio Trading Co Ltd | Extraterritorial | 2023 |
| Baoshijie Group Share Limited | Extraterritorial | 2024 |
| Baoz Club Ltd | Wholesale & retail | 2024 |
| Bapel Court Management Company Limited | Households | 1999 |
| Baput (Europe) Group Ltd | Extraterritorial | 2024 |
| Baqeh for Import and Export Co Ltd | Wholesale & retail | 2023 |
| Barber London Design Ltd | Information & communication | 2023 |
| Barko Decor Ltd | Extraterritorial | 2014 |
| Barnett Group Limited | Extraterritorial | 2016 |
| Barnfield Wood Consultants Ltd. | Professional & scientific | 2004 |
| Barnfield Wood Properties Limited | Construction | 2012 |
| Barnmead (Cator Estate) Residents Limited | Households | 1984 |
| Barno (China) Co., Limited | Extraterritorial | 2025 |
| Barons Residents Management Limited | Households | 2003 |
| Barracks Development Ltd | Construction | 2013 |
| Barrington & Barrington Ltd | Construction | 2015 |
| Barrinson Global Sports Limited | Arts & recreation | 2017 |
| Bartley's Flowers Limited | Wholesale & retail | 2000 |
| Barts Close Residents Committee Limited | Households | 1997 |
| Base Chemical Co., Ltd | Extraterritorial | 2023 |
| Bashir Tailoring Services Limited | Other services | 2020 |
| Basic B Ltd | Professional & scientific | 2025 |
| Basic International Group Limited | Wholesale & retail | 2018 |
| Basic Skills Centre Limited | Education | 2025 |
| Bates Homes Limited | Real estate | 2002 |
| Bato Cafe Co Ltd | Hospitality | 2024 |
| Bavin Technology Co., Ltd | Extraterritorial | 2024 |
| Bay View Laity Lane Management Company Limited | Real estate | 2022 |
| Baychain Technologies Ltd | Information & communication | 2021 |
| Bayse Technology Co., Ltd | Manufacturing | 2020 |
| Baysoom Industry & Trading Co., Ltd. | Extraterritorial | 2019 |
| Bayswater Street Limited | Professional & scientific | 2021 |
| Baytree Resource Management Limited | Water & waste | 2020 |