| 1ST Central Care Ltd | Health & social care | 2022 |
| 247 Plumbing, Heating & GAS Ltd | Construction | 2025 |
| 2S Capital Ltd | Transport & logistics | 2022 |
| 4 M.T.S. Ltd | Transport & logistics | 2022 |
| 50FIVEPLUS Limited | Financial services | 2011 |
| 666 Rigging Services Limited | Construction | 2025 |
| A & J Retail UK Ltd | Wholesale & retail | 2005 |
| A Better Life Dog Rescue Ltd | Agriculture & fishing | 2012 |
| A Design for ALL Ltd | Manufacturing | 2016 |
| A Grade Consultancy Limited | Administrative & support | 2024 |
| A Road School of Motoring Limited | Other services | 2010 |
| A S Estimations Limited | Professional & scientific | 2010 |
| A Salcevich Consultancy Limited | Construction | 2019 |
| A T Walklett Construction Services Limited | Construction | 2026 |
| A Taylor Electrical Limited | Construction | 2010 |
| A W R Construction Limited | Construction | 2007 |
| A-A Contract Ltd. | Health & social care | 2015 |
| A-Gain Fitness Limited | Arts & recreation | 2024 |
| A-Malax Ltd | Construction | 2026 |
| A.W. Fenn & Co Limited | Extraterritorial | 2014 |
| A1 Breakdown Recovery Ltd | Transport & logistics | 2013 |
| A1 Capital Holdings Limited | Financial services | 2022 |
| A1 Cooling and Heating Ltd | Construction | 2022 |
| A1 Residential & Commercial Sales Ltd | Real estate | 2022 |
| A1 Roadside Assistance Limited | Transport & logistics | 2025 |
| A2Z Eco Solutions Limited | Construction | 2025 |
| AA Air Ductwork Services Limited | Construction | 2008 |
| AA Excillent Ltd | Wholesale & retail | 2023 |
| Aaron Child Electrical Ltd | Construction | 2025 |
| Aayat Asia Ltd | Hospitality | 2025 |
| AB Import Ltd | Other services | 2018 |
| AB Tapers Ltd | Construction | 2005 |
| Abbot Datastore Limited | Transport & logistics | 1983 |
| Abbots Hall Primary Academy | Education | 2013 |
| Abcd Building Service Ltd | Construction | 2014 |
| Abds Healthcare Limited | Health & social care | 2023 |
| ABF Security Ltd | Administrative & support | 2023 |
| Abichael Limited | Information & communication | 2017 |
| ABM Contracting Mould and Damp Solutions Ltd | Construction | 2025 |
| Abycare Company Limited | Health & social care | 2019 |
| Accredisafe Solutions Ltd | Education | 2026 |
| Active Edge Therapy Limited | Health & social care | 2026 |
| Adaptive Environmental Ltd | Administrative & support | 2021 |
| Adcock Building Consultants Ltd | Construction | 2010 |
| Adderet Limited | Wholesale & retail | 2018 |
| Adesse Ltd | Professional & scientific | 2025 |
| Adhdinsync Limited | Health & social care | 2025 |
| Adrian Sandu Transport Ltd | Transport & logistics | 2023 |
| Advanced Brickwork Contracts Limited | Construction | 2004 |
| Aerialbase Limited | Information & communication | 2014 |
| AGC Chauffeur Drive Limited | Transport & logistics | 2019 |
| AGE Healthcare Ltd | Transport & logistics | 2025 |
| AGE Properties Limited | Real estate | 2022 |
| AIJ Services Limited | Construction | 2016 |
| AIN Electrical Limited | Construction | 2026 |
| Ajoke Limited | Health & social care | 2020 |
| AJW Bailiffs Ltd | Administrative & support | 2024 |
| Akar Cafe Ltd | Hospitality | 2017 |
| Akinloye Trading & Investments Holdings Limited | Financial services | 2021 |
| Aldor Limited | Construction | 2018 |
| Alex Freight Services Ltd | Transport & logistics | 2020 |
| Alex&Geo Trans Ltd | Transport & logistics | 2018 |
| ALL 4 Image Ltd | Construction | 2021 |
| ALL City Media Ltd. | Administrative & support | 2000 |
| ALL City Properties Limited | Administrative & support | 2006 |
| All-Civil Engineering Ltd | Construction | 2022 |
| Allied Certification Services Limited | Professional & scientific | 2014 |
| Alpha Auto Services Ltd | Wholesale & retail | 2022 |
| Alphasonn Ltd | Wholesale & retail | 2025 |
| Altrag Limited | Wholesale & retail | 2021 |
| Alupro Shopfronts & Windows Ltd | Manufacturing | 2016 |
| ALX Peters Limited | Other services | 2024 |
| AM Site Services Limited | Construction | 2019 |
| Amac Electrical Services Limited | Construction | 1997 |
| Amari Auto Ltd | Wholesale & retail | 2025 |
| Amba Hydraulics Holdings Limited | Financial services | 2023 |
| Amba Hydraulics Limited | Manufacturing | 1989 |
| Amber 8 Groundworks Limited | Construction | 2023 |
| Amedy.Mentenance Ltd | Construction | 2023 |
| Amparar Limited | Public administration | 2019 |
| Anchor Mediation Ltd | Professional & scientific | 2026 |
| Andreea Lori Limited | Transport & logistics | 2026 |
| AOB Marine Limited | Extraterritorial | 2012 |
| AP50 Ltd | Financial services | 2022 |
| Apex Roofing & Home Maintenance Ltd | Construction | 2025 |
| APH Building Property Services Limited | Construction | 2019 |
| Approved Clothing Ltd | Wholesale & retail | 2025 |
| Aquila Strategic Ltd | Transport & logistics | 2026 |
| Archive Document Data Storage Limited | Arts & recreation | 2004 |
| Archive Management Systems Limited | Administrative & support | 1989 |
| Arcom Construction and Maintenance Ltd | Construction | 2022 |
| Arederna Construction Ltd | Construction | 2022 |
| Armada House Properties Limited | Real estate | 2022 |
| Arunas Construction Limited | Construction | 2014 |
| Arvifin Solutions Ltd | Financial services | 2025 |
| AS Med-Care Ltd | Health & social care | 2024 |
| ASC Plumbing Limited | Construction | 2012 |
| Ashtonbunn Property Limited | Real estate | 2020 |
| ASJ Essex Real Estate Ltd | Real estate | 2026 |
| Aspirations Performing Arts Ltd | Arts & recreation | 2023 |