| ASH Fencing Supplies Ltd | Manufacturing | 2022 |
| Ashdown Close Limited | Households | 1995 |
| Ashlee Jenkins Limited | Wholesale & retail | 2024 |
| Ashlex Limited | Wholesale & retail | 1994 |
| Ashling Development Limited | Construction | 2026 |
| Ashridge House (Property Management) Limited | Real estate | 1982 |
| Ashstro Ballerz Coaching Ltd | Education | 2025 |
| Asian Market Limited | Wholesale & retail | 2009 |
| ASM Smtm Limited | Professional & scientific | 2025 |
| Aspect Flooring Contracts Limited | Construction | 2000 |
| Aspinell Limited | Construction | 2018 |
| Asps (Brighton) Limited | Wholesale & retail | 2016 |
| Asps Holdings Limited | Professional & scientific | 2016 |
| Association of Security Consultants Limited | Other services | 1991 |
| Assured Life Care Limited | Health & social care | 2014 |
| Aston Locks Limited | Administrative & support | 2005 |
| AT LDN Ltd | Professional & scientific | 2016 |
| Atlantic SEC Urity Services UK Ltd | Administrative & support | 2018 |
| Atlantis Caps Limited | Manufacturing | 2012 |
| Attache Global Limited | Construction | 2025 |
| Audela Intelligence Ltd | Professional & scientific | 2019 |
| Audiorec Limited | Information & communication | 1987 |
| Aurora I-House Limited | Construction | 2010 |
| Authentic Greek Way Ltd | Hospitality | 2025 |
| Auto-Smart Solutions Ltd | Wholesale & retail | 2008 |
| Automotive Air Conditioning Limited | Wholesale & retail | 2025 |
| Autoway Sundry Supplies Limited | Wholesale & retail | 2002 |
| Auxm Ltd | Wholesale & retail | 2023 |
| Aver Healthcare Ltd | Wholesale & retail | 2014 |
| Avery Property Investments Ltd | Real estate | 2022 |
| Aviation Enthusiasts Tours Limited | Administrative & support | 2011 |
| Avil Limited | Construction | 2014 |
| Avlo Ltd | Information & communication | 2026 |
| Axis Talent Management Ltd | Administrative & support | 2025 |
| Axispoint Engineering Ltd | Construction | 2026 |
| Aycorp Limited | Information & communication | 2013 |
| Ayton Build Ltd | Construction | 2025 |
| Aztech Tree Consultancy Ltd | Agriculture & fishing | 2026 |
| Azwerkz Ltd | Other services | 2024 |
| B & M London Limited | Wholesale & retail | 2013 |
| B B Electrical Contractors Ltd | Construction | 2017 |
| B C Location Services Limited | Transport & logistics | 1997 |
| B Folan Services Ltd | Professional & scientific | 2026 |
| B Frodsham Plumbing Limited | Construction | 2025 |
| B Ingham Plumbing & Heating Limited | Construction | 2009 |
| B Krishnachetty Limited | Health & social care | 2014 |
| B R Lewis Associates LLP | | 2010 |
| B Walker Limited | Wholesale & retail | 2011 |
| B&L Finance Systems Ltd | Information & communication | 2021 |
| B&P Partnership Limited | Real estate | 2025 |
| B&T Glass-Glazing-Windows Ltd | Construction | 2016 |
| B.Spoke Services Ltd | Wholesale & retail | 2009 |
| B.T Locksmith Services Limited | Other services | 2019 |
| B4 Project Services Ltd | Professional & scientific | 2020 |
| Babel Language Consulting Limited | Professional & scientific | 1996 |
| Baby DIP Ltd | Arts & recreation | 2025 |
| Baetrip&Barham Ltd | Information & communication | 2023 |
| Bainwood LDN Limited | Construction | 2025 |
| Bakers of Bexley Limited | Hospitality | 2012 |
| Baldwyns Mansion Freehold Limited | Households | 2005 |
| Baldwyns Properties Holdings Limited | Real estate | 2025 |
| Baldwyns Properties Limited | Real estate | 2018 |
| Ballin Digital Limited | Professional & scientific | 2016 |
| Bangalore Ltd | Health & social care | 2025 |
| Bardhi Properties Ltd | Real estate | 2023 |
| Barnes UK Contractors Ltd | Construction | 2022 |
| Barons Distributions Ltd | Wholesale & retail | 2025 |
| Barry Beveridge Landscapes Limited | Professional & scientific | 2011 |
| Barry Beveridge Property Maintenance Limited | Administrative & support | 2018 |
| Barry Cole Ltd | Transport & logistics | 2026 |
| Barry Properties and Investments Ltd | Real estate | 2026 |
| Baselayer Web Development Ltd | Information & communication | 2026 |
| Basing Drive Management Company Limited | Households | 1997 |
| Basnah Ventures Limited | Wholesale & retail | 2007 |
| Bayliss Smma Ltd | Professional & scientific | 2021 |
| BBM Sales Limited | Construction | 2014 |
| Bchc Trading Ltd | Administrative & support | 2026 |
| Bcsr Property Ltd | Real estate | 2021 |
| Beaconshaw Management Co. Limited | Real estate | 1978 |
| Bear Foot Flooring Limited | Wholesale & retail | 2024 |
| Beavers House Management Limited | Real estate | 1982 |
| Becca Caring Arms Limited | Health & social care | 2022 |
| BEE Connected Audio Visual Ltd | Manufacturing | 2022 |
| Beenu Madhavan Ltd | Health & social care | 2016 |
| Behaviour LAB Consulting Ltd | Professional & scientific | 2023 |
| Beijing Spring Ltd | Hospitality | 2019 |
| Bell Asphalt Co Ltd | Construction | 2013 |
| Belles Consulting Ltd | Administrative & support | 2026 |
| Belstead Limited | Real estate | 1987 |
| Belvoir Lodge RTM Company Limited | Real estate | 2011 |
| Benykem Ltd | Real estate | 2020 |
| Berdec Ltd | Construction | 2026 |
| Bescom (Services) Limited | Professional & scientific | 1990 |
| Bespoke Building Solutions South East Limited | Construction | 2021 |
| Bespoke Fitness Ltd | Other services | 2011 |
| Bespoke Living Carpentry Ltd | Manufacturing | 2018 |
| Bespoke Mastic Limited | Construction | 2016 |
| Bespoke Studios Ltd | Manufacturing | 2016 |
| Best Engineering Facilities Limited | Professional & scientific | 2007 |
| Beths Grammar School | Education | 2010 |