| 1-4 Richards Court Management Company Ltd | Households | 2003 |
| 12TH Trading Ltd | Wholesale & retail | 2024 |
| 13 Church Crescent Freehold Limited | Professional & scientific | 2009 |
| 14 Becmead Avenue RTM Company Limited | Households | 2018 |
| 19 Myddleton Road Management Limited | Extraterritorial | 2003 |
| 19-25 Watton Road (Ware) Limited | Households | 2002 |
| 20TH Century Fireplaces Ltd | Manufacturing | 2021 |
| 21ST Century Office Concepts Limited | Wholesale & retail | 1996 |
| 22X Ltd | Hospitality | 2023 |
| 24/7 365 Waste Removals & Management Ltd | Transport & logistics | 2025 |
| 2A Star Street Limited | Real estate | 2005 |
| 3 to 7 Star Street Ltd | Construction | 2014 |
| 3-X-AL Limited | Extraterritorial | 2010 |
| 33 Limes Grove Limited | Households | 1981 |
| 360 Leisure Consulting Ltd | Professional & scientific | 2026 |
| 3NINETEEN Limited | Administrative & support | 2020 |
| 4Z Alpha Ltd | Administrative & support | 2024 |
| 4Z Beta Ltd | Real estate | 2024 |
| 5 ST Patrick’S Road South Ltd | Financial services | 2024 |
| 5I Group Limited | Administrative & support | 2020 |
| 602 ABC Leytonstone High Road E11 Management Limited | Households | 2026 |
| 83-88 Aynsley Gardens RTM Company Ltd | Households | 2020 |
| 9 Trade Maintenance Ltd | Other services | 2017 |
| 9516 Limited | Construction | 2016 |
| :( Limited | Extraterritorial | 2024 |
| :) Limited | Extraterritorial | 2024 |
| A & a Construction & Surfacing Ltd | Construction | 2022 |
| A & C Kasap Properties Limited | Real estate | 2022 |
| A & J General Trading Ltd | Wholesale & retail | 2021 |
| A D Carpentry & Building Limited | Construction | 2009 |
| A E S (Air Conditioning) Limited | | 1992 |
| A G Surveying Ltd | Professional & scientific | 2016 |
| A N Game Building Contractors Ltd | Construction | 2013 |
| A P Galvin Services Ltd | Professional & scientific | 2017 |
| A Tanker Solution Limited | Water & waste | 2022 |
| A Wade Tax Consultancy Limited | Professional & scientific | 2025 |
| A&J Maintenance Services Ltd | Construction | 2024 |
| A-Star Properties Ltd | Construction | 2013 |
| A. Wilson & Sons (Islington) Limited | Construction | 1980 |
| A2A Secure Edge Consulting Limited | Information & communication | 2025 |
| AA Building Solutions Limited | Construction | 2022 |
| Aadrenalin Vehicle Services Ltd | Wholesale & retail | 2026 |
| AB Abode Construction Ltd | Construction | 2019 |
| AB Abode Developments Ltd Ltd | Construction | 2025 |
| AB Analysis Limited | Information & communication | 2007 |
| AB Analysis Trading Ltd | Financial services | 2021 |
| AB Flooring Limited | Construction | 2018 |
| Abbott Stoves Ltd | Construction | 2022 |
| Abbotts Court (Stanstead Abbotts) Management Limited | Administrative & support | 1999 |
| ABC Absolute Building and Carpentry Ltd | Construction | 2023 |
| Abhison Properties Ltd | Real estate | 2024 |
| Abos IT Services Ltd | Information & communication | 2017 |
| About-Me Limited | Information & communication | 2012 |
| Absolute Detective Agency Limited | Administrative & support | 2011 |
| AC7 Electrical Ltd | Construction | 2020 |
| Acatilia Ltd | Administrative & support | 2014 |
| Access Drop Limited | Wholesale & retail | 2025 |
| Accora Group Limited | Construction | 2024 |
| Accounting Wise Ltd | Professional & scientific | 2014 |
| Achieving Greenness Ltd | Professional & scientific | 2018 |
| Acorn Building Contracts (London) Ltd | Construction | 2018 |
| Acquisition People Limited | Administrative & support | 2026 |
| ACR Events Ltd | Administrative & support | 2020 |
| Acre Cars Ltd | Transport & logistics | 2013 |
| Actaea Group Limited | Financial services | 2015 |
| Action Projects Limited | Information & communication | 1996 |
| Actionsharp Limited | Professional & scientific | 1986 |
| Acutely Aware Ltd | Professional & scientific | 2024 |
| Adams & Sons Construction Ltd | Construction | 2020 |
| Adams & Sons Holdings Ltd | Construction | 2025 |
| Adia Lotz Limited | Health & social care | 2013 |
| ADK Advertising Ltd | Professional & scientific | 2019 |
| ADM Contracts Ltd | Construction | 2022 |
| ADR Mortgage Finance Ltd | Administrative & support | 2017 |
| AE Sports Services Ltd | Education | 2023 |
| AEN Coordination Ltd | Professional & scientific | 2019 |
| Aesthetics by Anya Ltd | Other services | 2026 |
| Aesthetics Wise Limited | Administrative & support | 2022 |
| Aestheticsbygabbi Ltd | Other services | 2024 |
| Affinity Carpentry Limited | Manufacturing | 2023 |
| Afregen Capital Limited | Professional & scientific | 2026 |
| AG Hand Ltd | Wholesale & retail | 2025 |
| AGH Homes Limited | Real estate | 2020 |
| Agivet Ltd | Professional & scientific | 2020 |
| Agro Cibos Holdings Limited | Financial services | 2020 |
| AHP Group Ltd | Construction | 2021 |
| Air Cooling Solutions Ltd | Construction | 2007 |
| AJD & Sons Ltd | Construction | 2014 |
| AK79 Consult Ltd | Information & communication | 2024 |
| Akasha (Ware) Limited | Arts & recreation | 2019 |
| AKB Compliance & Electrical Services Limited | Construction | 2026 |
| Alan Paul Limited | Real estate | 2025 |
| Albion Wycliffe House Ltd | Real estate | 2019 |
| Albury Building Services Ltd | Construction | 2014 |
| Albury Electrical Services Limited | Construction | 1983 |
| ALC Plumbing Limited | Construction | 2013 |
| Alderfield Consulting Ltd. | Professional & scientific | 2011 |
| Alectron Services Ltd | Construction | 2019 |
| Alev 27 Ltd | Hospitality | 2026 |
| Alexi Taylor Homes Limited | Construction | 2016 |