| &Baby Limited | Wholesale & retail | 2025 |
| 02262749 Limited | Construction | 1988 |
| 1 More Round Ltd | Arts & recreation | 2023 |
| 1 Talbot Road Freehold Management Company Limited | Households | 2009 |
| 111 Kennington Park Road Management Limited | Households | 2008 |
| 12 June Investments Limited | Administrative & support | 2025 |
| 12 Queen's Parade Management Company Limited | Real estate | 1995 |
| 13 Tadmor Street Limited | Households | 2016 |
| 1505 Management Ltd | Professional & scientific | 2023 |
| 17 Logistics Limited | Administrative & support | 2013 |
| 182 Queenstown Road Limited | Households | 2008 |
| 1953 Investments Ltd | Administrative & support | 2023 |
| 1980 Ltd | Financial services | 2020 |
| 1COVER Limited | Financial services | 2004 |
| 22 Tregothnan Road Limited | Real estate | 2008 |
| 23 Stockfield Road Management Company Limited | Real estate | 2013 |
| 24SEVEN Companies Ltd | Administrative & support | 2011 |
| 2A Park Avenue Management Company Limited | Households | 2002 |
| 2ND Rodeo Limited | Professional & scientific | 2025 |
| 3 -5 Drysdale Street Management Co Limited | Professional & scientific | 2002 |
| 333 Music Ltd | Wholesale & retail | 2022 |
| 37 Hova Villas Limited | Households | 2023 |
| 37 Lakeside Road Limited | Real estate | 2019 |
| 38 Pleasant Valley Management Co. Limited | Real estate | 1987 |
| 3D CAD Ltd | Professional & scientific | 1998 |
| 3RD Step Broadcast Ltd | Information & communication | 2013 |
| 3ROI Solutions Limited | Health & social care | 2022 |
| 4 & 5 Adams Forge Littleport Limited | Real estate | 2014 |
| 4 Dents Limited | Wholesale & retail | 2001 |
| 406 Investments Limited | Real estate | 2022 |
| 4SITE Holdings Ltd | Professional & scientific | 2019 |
| 505 Freight Limited | Transport & logistics | 2007 |
| 7TH Rise Ltd | Education | 2013 |
| 92B Cher Management Company Limited | Households | 2026 |
| A & C Translations Limited | Administrative & support | 1995 |
| A & J Residential Ltd | Real estate | 2013 |
| A C M Consulting Limited | Professional & scientific | 2010 |
| A Duncan Limited | Construction | 2002 |
| A Elliott Electrical Services Limited | Construction | 2019 |
| A F Vernon Building Construction Limited | Construction | 2002 |
| A Fine Balance Saffron Walden Limited | Arts & recreation | 2025 |
| A Freeman Carpentry & Construction Ltd | Construction | 2011 |
| A Friendly Bunch Ltd | Professional & scientific | 2022 |
| A H Brooks & SON Limited | Wholesale & retail | 2013 |
| A H Music Management Limited | Arts & recreation | 2017 |
| A I F Limited | Financial services | 2002 |
| A J Edwards & Associates Ltd. | Financial services | 2011 |
| A J Pest Control Ltd | Water & waste | 2009 |
| A Lifetime on the Hips Ltd | Information & communication | 2024 |
| A Touch of Madness Ltd | Manufacturing | 2024 |
| A Willis Electrical Services Ltd | Other services | 2022 |
| A&C Burchall Limited | Professional & scientific | 2014 |
| A. James (Jewellers) Limited | Wholesale & retail | 1943 |
| A.B. Moylan (Fuel Oils) Limited | Real estate | 1968 |
| A.B.C First AID Training Solutions Ltd | Other services | 2013 |
| A.J. Merritt Limited | Transport & logistics | 2026 |
| A.T. BIO Limited | Professional & scientific | 2024 |
| A/C Aviation Services Ltd | Professional & scientific | 2019 |
| A1 Fitness Ltd | Other services | 2024 |
| A13 Timber Limited | Wholesale & retail | 2018 |
| Aaks Food Ltd | Hospitality | 2024 |
| AB Distributions Ltd | Wholesale & retail | 2025 |
| AB2 Limited | Other services | 2021 |
| Abax Health Limited | Wholesale & retail | 2017 |
| Abberton Consulting Limited | Professional & scientific | 2016 |
| Abbey House Stays Limited | Real estate | 2025 |
| Abbey Investment Group Ltd | Financial services | 2024 |
| Abbeyfield Waste Ltd | Water & waste | 2016 |
| Abbeysort Limited | Other services | 2025 |
| Abbots Grange Developments Ltd | Construction | 2023 |
| Abcjphillips Analysis and Testing Ltd | Information & communication | 2012 |
| Abhk Ltd | Arts & recreation | 2017 |
| Abline Properties Ltd. | Construction | 2016 |
| Abode Property Limited | Real estate | 2003 |
| ABP Consultancy Properties Ltd | Professional & scientific | 2017 |
| Abrey & SON Limited | Wholesale & retail | 1999 |
| Absolute Stitches Ltd | Manufacturing | 2014 |
| Abwhackney Ltd | Construction | 2018 |
| Accuro (Care Services) | Health & social care | 2002 |
| ACD Architech Design Limited | Professional & scientific | 2024 |
| Acelera Capita Limited | Financial services | 2026 |
| Acemor Limited | Manufacturing | 2004 |
| Acert Associates Limited | Information & communication | 2009 |
| Acford Aviation Ltd | Professional & scientific | 2020 |
| Acid Folklore Ltd | Wholesale & retail | 2023 |
| Acorus Gardens Limited | Administrative & support | 2022 |
| Acrokool Limited | Professional & scientific | 1984 |
| Acronym Asset Management Ltd. | Professional & scientific | 2022 |
| Acti Laboratories UK Ltd | Wholesale & retail | 2006 |
| Acti Properties Ltd | Real estate | 2021 |
| Action on World Health LLP | | 2024 |
| Active Principle Limited | Professional & scientific | 2017 |
| AD Tech Collective Action LLP | | 2023 |
| Adas Reset Limited | Wholesale & retail | 2019 |
| Adbox Digital Limited | Information & communication | 2012 |
| Adeti Ltd | Information & communication | 2021 |
| Adible Limited | Wholesale & retail | 2016 |
| Admiral Welding Limited | Construction | 2000 |
| Adrian Brown Training Limited | Professional & scientific | 2012 |
| Adrian Gibbons Installations Limited | Manufacturing | 2004 |