| Athletic Revolution Ltd | Other services | 2025 |
| Atkinson Training Associates Limited | Information & communication | 2008 |
| Atlas General Trading LLC Co., Ltd | Administrative & support | 2021 |
| Atlas Software Solutions UK Ltd | Professional & scientific | 2020 |
| Atomic Form Ltd | Professional & scientific | 2024 |
| Atrast Compressor (UK) Ltd | Extraterritorial | 2019 |
| Atrium Capital Investments Limited | Real estate | 2025 |
| Attingo Limited | Professional & scientific | 2002 |
| Aurcra Marine Service Co., Ltd | Administrative & support | 2023 |
| Austere Medical Solutions Ltd | Health & social care | 2018 |
| Australia Aofuta Agrochymistry Ltd | Extraterritorial | 2019 |
| Authentic Aesthetics Ltd | Other services | 2020 |
| Auto-Services Solutions Ltd | Administrative & support | 2026 |
| Autodes Consulting Ltd | Transport & logistics | 2014 |
| AV Candy Limited | Wholesale & retail | 2006 |
| Avail Healthcare Ltd | Wholesale & retail | 2024 |
| Availa Limited | Real estate | 2010 |
| Avastec Limited | Information & communication | 2012 |
| Aviation Industry Skills Board (UK) Limited | Wholesale & retail | 2013 |
| Avlanimad Ltd | Professional & scientific | 2020 |
| Avon Catering Limited | Hospitality | 2024 |
| Avon Outfitters Ltd | Manufacturing | 2020 |
| Avon Ventures Ltd | Real estate | 2017 |
| Avonbridge Consultancy Services Limited | Extraterritorial | 2016 |
| Avra Capital Partners Ltd | Financial services | 2024 |
| Awnings & Accessories Direct Ltd | Wholesale & retail | 2009 |
| Axiom Consulting Limited | Information & communication | 2010 |
| B & N Hydraulics Limited | Manufacturing | 1987 |
| B & S Investments Limited | Real estate | 2006 |
| B a F Adams Ltd | Other services | 2015 |
| B Z Team Ltd | Arts & recreation | 2018 |
| B&H IT Consultancy Ltd | Information & communication | 2015 |
| B&R Textiles Group Co., Ltd | Wholesale & retail | 2007 |
| B.S.A. Front Wheel Drive Club | Other services | 1996 |
| Baby Box Bargains Ltd | Wholesale & retail | 2022 |
| Backstage Live Ltd | Information & communication | 2025 |
| BAD Logic Studios Ltd | Information & communication | 2018 |
| Bahar International Trading Co., Ltd | Administrative & support | 2024 |
| Bahcesehir University (UK Campus) Limited | Professional & scientific | 2016 |
| Bailings Garment Limited | Wholesale & retail | 2019 |
| Bali Chalk | Education | 2020 |
| Banawell Kitchens Limited | Other services | 2012 |
| Bank Aesthetics Limited | Other services | 2014 |
| Bansun (UK) International United Group Co., Limited | Extraterritorial | 2019 |
| Baoding Xinhengyue Pipe Fittings Co., Ltd | Administrative & support | 2024 |
| Baoding Zhengyan Clothing Sales Co., Ltd. | Financial services | 2023 |
| Baogu Steel Co., Ltd | Extraterritorial | 2018 |
| Bare Design Studio Ltd | Construction | 2016 |
| Barefacedgreek | Education | 2015 |
| Barford Mews (Kenilworth) Management Limited | Households | 2017 |
| Barnett & Partners Limited | Financial services | 1999 |
| Barrett Chemical Limited | Administrative & support | 2022 |
| Barrow and Randall Roads Residents Association Ltd | Real estate | 2020 |
| Barwick Securities Limited | Real estate | 1973 |
| Barwight Limited | Professional & scientific | 2009 |
| Baseworks Auto Care Ltd | Manufacturing | 2026 |
| Basi & Basi Administration Services Limited | Administrative & support | 2017 |
| Bassoon Co., Ltd | Extraterritorial | 2023 |
| Baxter Property Portfolio Limited | Real estate | 2025 |
| Bayliss Associates Ltd | Administrative & support | 2014 |
| Bayton-Varga Transport Ltd | Transport & logistics | 2024 |
| BC Auto Parts Company Limited | Administrative & support | 2024 |
| BDL Consulting Ltd | Information & communication | 2020 |
| Bdpg Limited | Manufacturing | 2022 |
| Beacon Marine International Trading Co., Limited | Extraterritorial | 2017 |
| Beagle Talent Ltd | Administrative & support | 2020 |
| Bear Cleaning Ltd | Administrative & support | 2017 |
| Beautility Ltd | Wholesale & retail | 2024 |
| Beginners Publishing House Ltd | Information & communication | 2009 |
| Beijing Gdnesis Controls Co., Ltd | Administrative & support | 2020 |
| Beijing Jiuyu Trading Co., Limited | Wholesale & retail | 2024 |
| Belgium Shiende Fertilizer Co., Ltd | Mining & quarrying | 2023 |
| Belle VIE Vintage Limited | Administrative & support | 2015 |
| Belmont Management (Kenilworth) Limited | Hospitality | 1992 |
| Belrai Limited | Real estate | 2016 |
| Belux UK Medical Technology Ltd | Manufacturing | 2020 |
| Benbow Design Limited | Other services | 2011 |
| Bespoke Property Developers Ltd | Construction | 2019 |
| Best Equipments Co., Ltd | Extraterritorial | 2019 |
| Best Fortune Appliance Co., Ltd | Extraterritorial | 2013 |
| Best Industry Co., Ltd | Administrative & support | 2024 |
| Best O British Travel & Tours Ltd | Administrative & support | 2022 |
| Bestar Rubber Tech Co., Ltd | Administrative & support | 2023 |
| Bestlink Logistics Limited | Transport & logistics | 2024 |
| Better IT NOW Ltd | Information & communication | 2026 |
| Betteridge Contracts Ltd | Administrative & support | 2020 |
| Beulah Construction Limited | Construction | 1997 |
| Bevcor Group Ltd | Professional & scientific | 2021 |
| Beya Co., Ltd | Administrative & support | 2023 |
| Beyond Social Ltd | Professional & scientific | 2017 |
| BGL Trading Ltd | Real estate | 2025 |
| BHH Property Management Limited | Real estate | 2018 |
| BIC Investment Ltd | Extraterritorial | 2019 |
| Big Blue Marble Explorer Limited | Information & communication | 2006 |
| Big Century Co., Ltd. | Extraterritorial | 2017 |
| Big Love Int'L Ltd | Extraterritorial | 2011 |
| Big WIN Boom Limited | Extraterritorial | 2021 |
| Binley Woods Approved Used Cars Ltd | Professional & scientific | 2013 |
| Binxm Trade Ltd | Wholesale & retail | 2026 |
| BIO With Confidence Ltd | Education | 2022 |