| 00346560 Limited | Professional & scientific | 1938 |
| 107 Bulwer Road (New Barnet) Limited | Households | 1992 |
| 1337X Limited | Real estate | 2022 |
| 17 Goodwyn Avenue Management Limited | Real estate | 1995 |
| 2 Wilkinson Court Ltd | Real estate | 2022 |
| 20 Briary Wood Lane Residents Limited | Households | 2005 |
| 20 Larkfield Road Limited | Households | 2008 |
| 22 North Parade Southwold Limited | Professional & scientific | 2006 |
| 25 Tabley Road Ltd | Administrative & support | 2017 |
| 36-38A Avondale Avenue Limited | Hospitality | 2004 |
| 365 IT Management Limited | Professional & scientific | 2017 |
| 36DIGITAL Limited | Information & communication | 2010 |
| 38BS Ltd | Real estate | 2025 |
| 39 Malvern Road Limited | Households | 2006 |
| 3XRRR Ltd | Other services | 2022 |
| 491 Holdings Ltd | Real estate | 2017 |
| 50 Durban Road West Limited | Households | 2007 |
| 52 Deptford Broadway Limited | Real estate | 2022 |
| 61 Warwick Road Limited | Real estate | 2005 |
| 6787X Limited | Real estate | 2022 |
| 800 Limited | Construction | 2004 |
| A J Barnes Silver Restorer Limited | Manufacturing | 2004 |
| A&E GAS Engineering Ltd | Other services | 2017 |
| A-Tec Plumbing and Heating Limited | Construction | 2014 |
| A.B.A. Decorating Services Limited | | 1986 |
| A.C. Dean Limited | | 1979 |
| A.M.Fenner Limited | | 1935 |
| A.R. Davies Refinishing Supplies Limited | Wholesale & retail | 2008 |
| A2Z Forklift Training Ltd | Education | 2019 |
| Aarley Consulting Limited | Information & communication | 2007 |
| Abbeycross Construction Limited | Administrative & support | 2007 |
| ABC Building Services Limited | Construction | 2004 |
| Abco Computers Limited | Professional & scientific | 1992 |
| Acacia Training Limited | Education | 2000 |
| Acacia Training Partners LLP | | 2018 |
| Academy for Sickle Cell and Thalassaemia (Ascat) Ltd | Public administration | 2023 |
| Academy Limousines Ltd | Transport & logistics | 2003 |
| Accountancy to Management Limited | Professional & scientific | 2006 |
| Acebest Limited | | 1988 |
| Acksam Limited | Real estate | 1985 |
| Actosa Limited | Information & communication | 2005 |
| Acudantia Limited | Information & communication | 2007 |
| Acute Developments (Finchley) Limited | Professional & scientific | 2007 |
| AD Osteopathy Ltd | Health & social care | 2006 |
| Adamot Limited | Real estate | 2010 |
| Adolph Numerical Controls Limited | Administrative & support | 1975 |
| Agenco Ltd | Professional & scientific | 2005 |
| Agility by Nature Limited | Professional & scientific | 2019 |
| Airport Direct Transfer Ltd | Transport & logistics | 2024 |
| Ajouve Limited | Information & communication | 2015 |
| AJT Wiring Systems Ltd | Information & communication | 2015 |
| AK Info Tech Limited | Information & communication | 2018 |
| AKK Investments Ltd | Real estate | 2011 |
| Akytom Studio Limited | Professional & scientific | 2020 |
| Alan Dodds Limited | Professional & scientific | 2006 |
| Alawad Medical Ltd | Health & social care | 2009 |
| Alban Actuarial Solutions Ltd | Financial services | 2007 |
| Albion Management Company(Hertford) Limited | Professional & scientific | 1967 |
| Aldenham Aviation 2 Limited | Extraterritorial | 2023 |
| Aldenham Aviation Limited | Transport & logistics | 1948 |
| Alderley Advisors Limited | Financial services | 2018 |
| Alderzone Limited | Arts & recreation | 1985 |
| Alexzone Ltd | Information & communication | 2011 |
| Allaway Acoustics Limited | Construction | 1969 |
| Allaway Group Limited | Real estate | 1990 |
| Allaway Manufacturing Limited | Manufacturing | 1987 |
| Alpha Air Conditioning UK Limited | Construction | 2004 |
| Alphatronic Electronics Limited | | 1985 |
| Alswick Hall Farms Limited | Agriculture & fishing | 1961 |
| Alternative Investment Index Ltd | Professional & scientific | 2007 |
| ALX Consulting Ltd | Administrative & support | 2018 |
| Ambient Services Limited | Construction | 2004 |
| Ameeeerah Ltd | Real estate | 2017 |
| AMH Maintenance Ltd | Construction | 2009 |
| Anadeals Limited | Real estate | 1977 |
| Andre Etienne Carpet & Floorcovering Limited | Wholesale & retail | 2005 |
| Andrew Campbell Limited | Information & communication | 2006 |
| Anglia Insulation & Roofing Supplies Limited | | 1975 |
| Anna Dempster Associates Limited | Professional & scientific | 2007 |
| Anton Taxis Ltd | Administrative & support | 2016 |
| Appin Films Limited | Information & communication | 2004 |
| APT Electrical Limited | Construction | 2005 |
| Aquila Logistics Limited | Transport & logistics | 2004 |
| Aran Community Services Limited | Health & social care | 2004 |
| Arbtree Ltd | Administrative & support | 2007 |
| ARK Salons Limited | Other services | 2014 |
| Armstrong Express Deliveries Limited | | 1986 |
| Arrange My Chauffeur Ltd | Transport & logistics | 2025 |
| Arthur Simms New Homes Limited | Professional & scientific | 2007 |
| Ashby Garden Homes Limited | | 1983 |
| Ashby Plastering Services Limited | Construction | 2004 |
| Ashoka Outdoor Catering Limited | Hospitality | 2026 |
| Aspect Business Psychology Limited | Professional & scientific | 2005 |
| Asprey Block Management Ltd | Real estate | 2021 |
| Audley and Stratfield Management Limited | Real estate | 2006 |
| Aurex Invest Limited | Real estate | 2026 |
| Austin Computer Services Limited | Information & communication | 1980 |
| Autorunner Limited | | 1982 |
| Avenir Heights Ltd | Real estate | 2020 |
| Avenue 31 Limited | Professional & scientific | 2020 |