| Awakin Limited | Professional & scientific | 2015 |
| AWR Consultancy Limited | Professional & scientific | 2012 |
| Axelle Services Ltd | Administrative & support | 2018 |
| Axios Properties Limited | Real estate | 2017 |
| Axpt Ltd | Professional & scientific | 2024 |
| Axtera Innovations Ltd | Information & communication | 2022 |
| AY2 Property Development Ltd | Construction | 2017 |
| Aylin White Ltd | Administrative & support | 2008 |
| Ayora Executive Travel Ltd | Transport & logistics | 2026 |
| Ayrestek Limited | Information & communication | 2015 |
| Ayrish Investments Ltd | Real estate | 2025 |
| AZ Secure Limited | Information & communication | 2009 |
| AZG Consultants Ltd | Professional & scientific | 2025 |
| AZK Consultancy Ltd | Professional & scientific | 2020 |
| Azzago Limited | Information & communication | 2014 |
| B & D Private Ltd | Wholesale & retail | 2023 |
| B & K (Southern) Fire Protection Limited | Construction | 1997 |
| B W Grey Holdings Limited | Professional & scientific | 2012 |
| B WEL Limited | Construction | 2014 |
| B&K Weybridge Sushi Ltd | Hospitality | 2024 |
| B&R Furnishings Limited | Wholesale & retail | 2014 |
| B. Grewal Limited | Other services | 2016 |
| B.G.F. Management Company Limited | Households | 1995 |
| B.J.B. Windows Limited | Construction | 1988 |
| BA Advisory and Partners Limited | Financial services | 2021 |
| BAA Automotive Alliance Ltd | Administrative & support | 2023 |
| Baby Sleep Rescue Ltd | Other services | 2014 |
| Babylonlane Limited | Information & communication | 1993 |
| Bachetta Property Holding Ltd | Real estate | 2026 |
| Bachmano Dvaras Ltd | Hospitality | 2024 |
| Back Office 2 Business Ltd | Professional & scientific | 2020 |
| Back to Health Wellness Products Ltd | Construction | 2025 |
| Back to Roots Limited | Professional & scientific | 2013 |
| BAD Dogs and Englishmen Ltd | Other services | 2016 |
| BAE Systems Applied Intelligence (International) Limited | Information & communication | 2009 |
| BAE Systems Applied Intelligence Limited | Information & communication | 1977 |
| Bahisfinshaw Limited | Financial services | 2024 |
| Bailey Construction UK Limited | Construction | 2006 |
| Bailey Creative Design Limited | Professional & scientific | 2009 |
| Bailey Plumbing & Heating (UK) Ltd | Construction | 2014 |
| Bains IT Ltd | Information & communication | 2015 |
| Baker Gardens Ltd | Administrative & support | 2015 |
| Bakeregg Ltd | Manufacturing | 2022 |
| Bakersgate Developments (Gomshall) Ltd | Construction | 2016 |
| Bakersgate Developments Limited | Construction | 2015 |
| Balfour RD Properties Ltd | Real estate | 2014 |
| Ballair Limited | Manufacturing | 2023 |
| Ballerino Holdings Limited | Financial services | 2020 |
| Ballerino Properties Ltd | Construction | 2003 |
| Balliol Consulting Limited | Information & communication | 1998 |
| Balmoral Projects Limited | Professional & scientific | 2002 |
| Bamboo Health Coaching Ltd | Other services | 2018 |
| Bamboo Sales and Marketing Consultancy Ltd | Professional & scientific | 2019 |
| Bambuu Services Limited | Professional & scientific | 2017 |
| Bandweaver Technology Limited | Professional & scientific | 2016 |
| Bangerz and Smash Ltd | Hospitality | 2025 |
| Banksia Homes Ltd | Real estate | 2019 |
| Bannamore (Guildford) Developments | | 1988 |
| Bannermont (Abbeyfield) Management Limited | Households | 1986 |
| Barcam Limited | Manufacturing | 2004 |
| Bard Marketing Limited | Professional & scientific | 2017 |
| Barden Contractors Limited | Transport & logistics | 2013 |
| Bargain Building Supplies 2020 Limited | Wholesale & retail | 2020 |
| Bargate Property Services Limited | Real estate | 2009 |
| Barlow Robbins LLP | | 2006 |
| Barlow Robbins Nominees Limited | Administrative & support | 1992 |
| Barlow Robbins Secretariat Limited | Professional & scientific | 2000 |
| Barlow Robbins Trustees Limited | Administrative & support | 2017 |
| Barnes Roofing Contractors Limited | Construction | 2023 |
| Barnes Roofing Limited | Construction | 2014 |
| Barneyjules Properties Limited | Real estate | 2016 |
| Barnwood Mews (Guildford) Management Company Limited | Households | 2004 |
| Barrett Building Contractors Limited | Construction | 2005 |
| Barrows (Maintenance & Construction) Limited | Construction | 2015 |
| Bart's Cafe Ltd | Hospitality | 2017 |
| Bartlett Christie Holdings Limited | | 1964 |
| Barton Knight Contracting Limited | Construction | 2013 |
| Barton Knight Electrical (Southern) Limited | Construction | 2013 |
| Barton Knight Electrical Limited | Construction | 2006 |
| Barton Knight Energy Limited | Construction | 2018 |
| Barton Knight Group Ltd | Financial services | 2022 |
| Basalt Digital Limited | Professional & scientific | 2014 |
| Basemap Limited | Information & communication | 2000 |
| Basilea Medical Limited | Administrative & support | 2007 |
| Baspop Holding Limited | Hospitality | 2010 |
| Bassage Eyes Ltd | Wholesale & retail | 2023 |
| Bastion Investments Limited | Real estate | 1956 |
| Bath Island Trading Ltd | Financial services | 2024 |
| Battersea Rise Restaurant LLP | | 2011 |
| Battle Grapple Limited | Arts & recreation | 2019 |
| Bauble Services Limited | Administrative & support | 1997 |
| Bavarian Bikes Ltd | Wholesale & retail | 2023 |
| Bawtry Hub Clamp Limited | Real estate | 2026 |
| Baxter Solutions Ltd | Information & communication | 2015 |
| Bay Homes Limited | Construction | 2019 |
| Baycliffe Management Company Limited | Real estate | 2005 |
| Bayhills Investments Limited | Professional & scientific | 2026 |
| Bays Consulting Limited | Professional & scientific | 2009 |
| BAZ Barber Fade Zone Ltd | Other services | 2023 |
| Bb&S Limited | Health & social care | 2025 |