| 1-8 Woodlands (PR) Management Limited | Households | 2009 |
| 183 RCS Limited | Households | 2025 |
| 2 the Point Consulting Ltd | Professional & scientific | 2007 |
| 24 Hour Active Limited | Arts & recreation | 2012 |
| 2A Local Store Limited | Wholesale & retail | 2026 |
| 3HEAT Limited | Construction | 2020 |
| 53/55 Avondale Road Limited | Households | 2019 |
| 59 Property Ltd | Real estate | 2021 |
| 82-84 Dagnan Road Management Company Limited | Households | 2004 |
| A & a Building Maintenance (UK) Limited | Administrative & support | 2006 |
| A DUE BUS Limited | Arts & recreation | 2014 |
| A P Spindle Tooling Ltd | Manufacturing | 2022 |
| A Swansbury (Woodfinishing) Limited | Manufacturing | 2009 |
| A&W Precision Engineering Limited | Wholesale & retail | 2017 |
| A.J. Walker (Farm) Limited | Agriculture & fishing | 1983 |
| A1 Bouncy Castle Ltd | Arts & recreation | 2021 |
| Abraxas Financial Consultants Limited | Extraterritorial | 1986 |
| Ace Chauffeurs Ltd | Transport & logistics | 2023 |
| Acrylic Artists Limited | Professional & scientific | 2022 |
| Active Personal Development Limited | Administrative & support | 2016 |
| Adaptomy Limited | Professional & scientific | 2016 |
| Adhd Cafe & Restaurant Group Ltd | Hospitality | 2024 |
| Adhd Group Ltd. | Other services | 2023 |
| Adhd Hospitality Ltd | Wholesale & retail | 2024 |
| Aenaon 1 Ltd | Real estate | 2023 |
| Aerospace Classics Limited | Administrative & support | 2011 |
| Aescwood Farm Riding School Limited | Arts & recreation | 2010 |
| Aidens Coffee & Co Ltd | Hospitality | 2025 |
| Aisling Tara Productions Limited | Arts & recreation | 2015 |
| AJJ Inc. Ltd | Professional & scientific | 2015 |
| AJS Group Holdings Limited | Financial services | 2017 |
| AJS Property Investments Ltd | Real estate | 2017 |
| AJT Software Consultancy Limited | Information & communication | 2016 |
| Akar Food & Beverage Ltd | Hospitality | 2025 |
| Alan Hester Associates Limited | Professional & scientific | 2004 |
| ALB2 Ltd | Professional & scientific | 2025 |
| Album Consulting Limited | Professional & scientific | 2018 |
| Album Holdings Limited | Financial services | 2024 |
| Alister Ltd | Information & communication | 2016 |
| ALL ODD Socks Ltd | Information & communication | 2018 |
| Allied Healthcare Consultancy Ltd | Professional & scientific | 2022 |
| Alltransports Limited | Transport & logistics | 2006 |
| Almond Way Residents Association Limited | Households | 1989 |
| Alpine Walks Ltd | Administrative & support | 2025 |
| Amarelo Property Ltd | Real estate | 2025 |
| Amelia Cranmer Equine Ltd | Agriculture & fishing | 2024 |
| Amino Lager Ltd | Manufacturing | 2026 |
| AMX Events Ltd | Professional & scientific | 2024 |
| Anderdons Farm Management Company Limited | Households | 1991 |
| Anglesey Gems Ltd | Hospitality | 2026 |
| Anlauf Limited | Hospitality | 2023 |
| Anton Hazelle Limited | Manufacturing | 2008 |
| ANY Steel Fabrications Limited | Manufacturing | 2008 |
| Apex Build International Ltd | Professional & scientific | 2022 |
| Appknowledge Ltd | Information & communication | 2014 |
| Aptus Talent Services Ltd | Administrative & support | 2025 |
| Arbor Casa Ltd | Real estate | 2023 |
| Ardenlea Fire Consulting Limited | Professional & scientific | 2013 |
| Arhw Ltd | Information & communication | 2024 |
| Aristocat Properties Limited | Extraterritorial | 2009 |
| Arthur Beale Limited | Wholesale & retail | 1941 |
| Ascendr Limited | Information & communication | 2022 |
| Ascensis Limited | Real estate | 2015 |
| Ascent Complete Electrical Services Limited | Construction | 2000 |
| Ashridge Home Care Limited | Health & social care | 2016 |
| Ashton Property Management Ltd | Real estate | 1995 |
| Asiedu Information Systems & Technology Ltd | Information & communication | 2016 |
| Assistance Dogs (UK) | Other services | 2006 |
| Associate Investments Limited | Administrative & support | 2005 |
| Aston Business Solutions Limited | Information & communication | 2018 |
| Astra Sportswear Limited | Wholesale & retail | 2023 |
| Astrazone Property Management Limited | Households | 2003 |
| Astura Consulting Ltd | Professional & scientific | 2025 |
| Auctioneersvault Ltd | Information & communication | 2014 |
| Audio Eleven Ltd | Administrative & support | 2024 |
| Avery Brothers Ltd | Construction | 2014 |
| AVO Tuning HQ UK Ltd | Wholesale & retail | 2020 |
| Aylesbury Opera Productions Limited | Arts & recreation | 2024 |
| B&L Building and Landscaping Ltd | Construction | 2025 |
| B.E.P. Contracting Limited | Construction | 2005 |
| B.O Tecnico Ltd | Information & communication | 2009 |
| Ball and Bence Limited | Professional & scientific | 2025 |
| Bar Lane Management Company Limited | Other services | 2001 |
| Bardells LLP | | 2009 |
| Barnes Holland Publishing Limited | Extraterritorial | 2009 |
| Battery Revolution Ltd | Construction | 2024 |
| Beauty Core Limited | Manufacturing | 2017 |
| Beehive Projects Limited | Other services | 2008 |
| Bella Casa (Staffordshire) Limited | Professional & scientific | 2012 |
| BHA Investments Holding Company Ltd | Real estate | 2023 |
| Birchenwood Limited | Real estate | 2024 |
| Birks Motor Works Limited | Wholesale & retail | 2017 |
| Bishopsgate Distillery & Wine Company Limited | Manufacturing | 2005 |
| Bledlow Consulting Limited | Administrative & support | 2014 |
| BLK South Ltd | Other services | 2013 |
| Body Renewell Ltd | Administrative & support | 2010 |
| Bohanna Griffin Associates Limited | Administrative & support | 2006 |
| Bramall CS Services Limited | Professional & scientific | 2018 |
| Brand Holdings Group Limited | Financial services | 2021 |
| Brandtold Ltd | Professional & scientific | 2025 |