| Agile Consultation Ltd | Information & communication | 2024 |
| Agile Managed Services Ltd. | Professional & scientific | 2018 |
| Agiliom Technology Services Limited | Information & communication | 2020 |
| Agility Cyber Limited | Information & communication | 2023 |
| Agility Planning and Design Ltd | Administrative & support | 2016 |
| Agora Consulting Services Limited | Other services | 2022 |
| Agora Holdings Limited | Other services | 2022 |
| Agorazo Ltd | Real estate | 2018 |
| Agriedge Advisory Ltd | Professional & scientific | 2026 |
| Agripay Global Limited | Financial services | 2022 |
| AH Retail Limited | Wholesale & retail | 2025 |
| AHA Coaching Learning and Consulting Ltd | Transport & logistics | 2021 |
| Ahmed Paradigm Limited | Construction | 2019 |
| Ahods Limited | Information & communication | 2019 |
| AI YOU CAN Trust Ltd | Information & communication | 2026 |
| Aibx Energy Ltd | Information & communication | 2024 |
| AIM Housing Limited | Information & communication | 2022 |
| Aion Partners Limited | Other services | 2019 |
| Air Alert Ltd | Information & communication | 2026 |
| Air Motive Limited | Transport & logistics | 2020 |
| Air-Homes Ltd | Real estate | 2022 |
| Airblue Services Ltd | Wholesale & retail | 2026 |
| Aircraft and Ground Limited | Transport & logistics | 1988 |
| Aires Films Limited | Information & communication | 2017 |
| Airly Air Quality Services Ltd | Information & communication | 2021 |
| Aitonomi Limited | Information & communication | 2020 |
| Aiven UK Ltd | Information & communication | 2019 |
| AJ Media Ltd | Information & communication | 2010 |
| Ajax Auto Care Ltd | Administrative & support | 2025 |
| AJB Home Estates Limited | Real estate | 2024 |
| AJC Engineering Warwickshire Limited | Professional & scientific | 2019 |
| AJD Instruments Limited | Professional & scientific | 2008 |
| Ajiofuf Property Ltd | Real estate | 2024 |
| Ajliddar Limited | Real estate | 2024 |
| AJM Bespoke Metal Work Ltd | Manufacturing | 2021 |
| AJR Concept Ltd | Professional & scientific | 2022 |
| AKA Brand Limited | Professional & scientific | 2023 |
| AKA1 Limited | Real estate | 2015 |
| Akibare Limited | Administrative & support | 2016 |
| Akin Communications Ltd | Wholesale & retail | 2019 |
| Akin Group Ltd | Financial services | 2026 |
| Akshar Yogi Limited | Information & communication | 2022 |
| Alacrity Legal Services Limited | Professional & scientific | 2019 |
| Alampata Ltd | Information & communication | 2014 |
| Alauna Holdings Limited | Construction | 2023 |
| Alba Instrumentation Limited | Professional & scientific | 2008 |
| Albatross Dream Limited | Real estate | 2024 |
| Albion Saddlemakers Company Limited | Manufacturing | 1984 |
| Albrighton Investments Limited | Real estate | 2018 |
| Alchemie Limited | Manufacturing | 1987 |
| Alcina Engineering Ltd | Manufacturing | 2015 |
| Alderson House (Warwick) Limited | Other services | 1960 |
| Aleido Learning UK Limited | Education | 1994 |
| Aleido UK Limited | Information & communication | 2007 |
| Alekstra UK Limited | Information & communication | 2018 |
| Alexa’S Handles Property Warwick Limited | Real estate | 2022 |
| Alextench Ltd | Information & communication | 2026 |
| Alfa Systems Limited | Real estate | 2012 |
| Alfie Dog Limited | Information & communication | 2011 |
| Algebra Consulting Limited | Professional & scientific | 2022 |
| Algebra Investments Limited | Financial services | 2018 |
| Algo Group Ltd | Professional & scientific | 2025 |
| Aliaro Corporation (UK) Ltd | Information & communication | 2019 |
| ALL Craft Engineering Limited | Wholesale & retail | 2006 |
| ALL Design London Limited | Professional & scientific | 2019 |
| ALL Good Homes Limited | Real estate | 2024 |
| ALL Gravy Limited | Information & communication | 2022 |
| ALL Tax Problems Limited | Professional & scientific | 2012 |
| ALL the Rewards Limited | Professional & scientific | 2022 |
| ALL Together Retreats Limited | Hospitality | 2024 |
| Allard Way Coventry Residents Management Company Limited | Households | 2024 |
| Allen Energy Consultants Ltd | Professional & scientific | 2020 |
| Allen Ford (UK) Limited | Wholesale & retail | 2003 |
| Allerton and Allerton Limited | Extraterritorial | 2013 |
| Allesley Garage Limited | Wholesale & retail | 2006 |
| Alliance Best Practice Limited | Financial services | 2013 |
| Alliance Diagnostic Services Limited | Health & social care | 2000 |
| Alliance Medical Group Limited | Professional & scientific | 2007 |
| Alliance Medical Holdings Limited | Professional & scientific | 2000 |
| Alliance Medical Leasing Limited | Administrative & support | 2014 |
| Alliance Medical Limited | Health & social care | 1987 |
| Alliance Medical Radiopharmacy Limited | Manufacturing | 2002 |
| Allied Motion Ferndown Limited | Administrative & support | 2007 |
| Allo Beirut Ltd | Hospitality | 2025 |
| Allround Wannabe Ltd | Professional & scientific | 2023 |
| Ally's Holdings Limited | Real estate | 2025 |
| Alma + Partners Limited | Other services | 2020 |
| Alma Land Limited | Construction | 2018 |
| Almat Flying Academy Ltd | Education | 2018 |
| Almond Design Care Limited | Professional & scientific | 2014 |
| Alora Asset Ltd | Real estate | 2022 |
| Alplast BC Limited | Construction | 2018 |
| ALS Industrial Services Ltd | Manufacturing | 2016 |
| Altergaia Limited | Information & communication | 2018 |
| Alternative Business School Ltd | Professional & scientific | 2018 |
| Altimax Properties Limited | Real estate | 2012 |
| Altitude Growth Limited | Professional & scientific | 2024 |
| Alva Labs International Limited | Information & communication | 2022 |
| Alvina Global Ltd | Financial services | 2025 |
| AM Lagonda (UK) Limited | Extraterritorial | 2009 |