| Arzul Products Ltd | Wholesale & retail | 2026 |
| ASD Kuttler Ltd. | Health & social care | 2019 |
| Ashby Welding & Fabrication Limited | Manufacturing | 2020 |
| Ashdown Advisors Limited | Administrative & support | 2018 |
| Ashford Hill Park Management Company Limited | Households | 2002 |
| Ashgrove Southern Limited | Real estate | 2016 |
| Ashvalley Residents Company Limited | Households | 1992 |
| Ashworth Homes 45 Limited | Real estate | 2018 |
| Asiya Properties Ltd | Real estate | 2016 |
| Asoo Management Ltd | Real estate | 2022 |
| Aspect Property Holdings Ltd | Real estate | 2024 |
| Aspen Construction Limited | Construction | 1997 |
| Aspen Property Management Farnham Ltd | Real estate | 2016 |
| Aspire Accounting Limited | Professional & scientific | 2009 |
| Aspire Bookkeepers Ltd | Professional & scientific | 2014 |
| Aspire Racing Limited | Arts & recreation | 2010 |
| ASR Freeholds Ltd | Construction | 2026 |
| Assent Financial Limited | Professional & scientific | 2018 |
| Asset Harbour Mortgages & Protection Ltd | Financial services | 2019 |
| Asset Harbour Properties Limited | Real estate | 2021 |
| Association for Interactive Media and Micropayments Ltd | Other services | 2008 |
| Association of International Property Professionals Limited | Real estate | 2006 |
| Aston Mowbray Ltd | Financial services | 2010 |
| Aston Programs Limited | Information & communication | 2011 |
| Aston-Chester Limited | Professional & scientific | 2015 |
| Astraea HR Ltd | Information & communication | 2019 |
| Atelier K Ltd | Information & communication | 2016 |
| Atelierwest Ltd | Professional & scientific | 2013 |
| Atmospheric Dispersion Modelling Limited | Professional & scientific | 1997 |
| Atomus Commercial Estates Ltd | Real estate | 2020 |
| Atomus Limited | Information & communication | 2005 |
| Atomus Properties Ltd | Real estate | 2017 |
| Atticus Holdings Limited | Administrative & support | 1998 |
| Aubrey Interiors Limited | Wholesale & retail | 2015 |
| Audentia Recruitment Ltd | Administrative & support | 2013 |
| Audiophile Digital Music Masters Ltd | Wholesale & retail | 2019 |
| Audiophile Digital Optical Technology Limited | Manufacturing | 2022 |
| Audley House Management Company Limited | Households | 1990 |
| Audr AI Limited | Information & communication | 2026 |
| Audr UK Limited | Information & communication | 2023 |
| Aunt FLO Organisation Ltd | Education | 2021 |
| Aura Party Events Ltd | Hospitality | 2025 |
| Aureo Filo Limited | Professional & scientific | 2014 |
| Aurora Legal Limited | Professional & scientific | 2018 |
| Aurora Property Management Holdings Limited | Hospitality | 2021 |
| Aurora Property Management Limited | Hospitality | 2021 |
| Aurora Strategic Consulting Ltd | Professional & scientific | 2024 |
| Austin Lakin Clark Ltd | Financial services | 2015 |
| Austyns Project Administration Limited | Construction | 1989 |
| Autism Assessments Farnham Ltd | Health & social care | 2023 |
| Auto Key Services Ltd | Administrative & support | 2024 |
| Automaster Vali Ltd | Wholesale & retail | 2025 |
| Automata IT Services Ltd | Wholesale & retail | 2020 |
| Autorelica Limited | Wholesale & retail | 2021 |
| Autos 4 YOU Ltd | Wholesale & retail | 2019 |
| Autramalle (UK) Limited | Real estate | 2020 |
| Avaho Limited | Extraterritorial | 2014 |
| Avanzconsulting Ltd | Information & communication | 2015 |
| Avelec Solutions Limited | Professional & scientific | 2011 |
| Aveley House Management Limited | Households | 1989 |
| Avenuebio Consulting Ltd. | Administrative & support | 2017 |
| Averley Wood Properties Limited | Real estate | 1985 |
| Aviaction Limited | Administrative & support | 2012 |
| Aviation Advisors Limited | Transport & logistics | 2000 |
| Aviation Filming Limited | Information & communication | 2018 |
| Avicam Homes Limited | Construction | 2000 |
| Avidan Group Ltd | Construction | 2015 |
| Aviella Consulting Limited | Financial services | 2024 |
| Avina Estates Limited | Construction | 2012 |
| Avocet Roofing Ltd | Construction | 2019 |
| Avon Court Management (Farnham) Limited | Administrative & support | 2002 |
| AW Wholesales Ltd | Professional & scientific | 2022 |
| Awarded 2U Limited | Wholesale & retail | 2008 |
| Aware Holdings Limited | Financial services | 2018 |
| AWM Accountancy & Taxation Limited | Professional & scientific | 2002 |
| Awwc Limited | Professional & scientific | 2023 |
| Axcelsis Solutions Limited | Professional & scientific | 2015 |
| Axiom Gdtr Limited | Financial services | 2023 |
| Axiom International Market Communications Limited | Information & communication | 1988 |
| Aykroyd & Co Ltd | Real estate | 2017 |
| AZ Advice Limited | Professional & scientific | 2014 |
| AZ Movers Ltd | Transport & logistics | 2025 |
| Azul Care Ltd | Health & social care | 2022 |
| Azure Specialist Consultants Limited | Professional & scientific | 2018 |
| Azzurro Marketing Limited | Professional & scientific | 2018 |
| B & N Carpets Limited | Wholesale & retail | 2002 |
| B a Richins Painting & Decorating Ltd | Construction | 2015 |
| B C Facilities Ltd | Construction | 2012 |
| B Manda Services Limited | Administrative & support | 2015 |
| B S T Media Limited | Information & communication | 2004 |
| B&C Coachworks Limited | Wholesale & retail | 2023 |
| B&G Walters Ltd | Real estate | 2018 |
| B-Contagious Ltd | Professional & scientific | 2024 |
| B-Sharp Solutions Limited | Professional & scientific | 2016 |
| B.D.Dews Consulting Limited | Other services | 2012 |
| B.M. Graham Limited | Manufacturing | 1976 |
| B2 Tyres Tongham Limited | Wholesale & retail | 2026 |
| Baby Seahorses Limited | Arts & recreation | 2019 |
| Back to Action Physiotherapy and Sports Injuries Ltd | Health & social care | 2022 |
| Back to Food Ltd | Manufacturing | 2023 |