| Agrodigital & Biological Solutions Limited | Agriculture & fishing | 2018 |
| Agunlejika Estate Ltd | Real estate | 2021 |
| AH Education Consultant Limited | Professional & scientific | 2011 |
| Ahava Rhythm Ltd | Health & social care | 2018 |
| Ahaya Properties Ltd | Real estate | 2024 |
| AHK Invest UK Ltd | Financial services | 2023 |
| Ahmad Direct Limited | Transport & logistics | 2025 |
| Ahmed Catering Swindon Ltd | Hospitality | 2026 |
| Ahmsha Ltd | Wholesale & retail | 2025 |
| AHS Catering Ltd | Extraterritorial | 2017 |
| AHS Swindon Limited | Construction | 2002 |
| AHS Wiltshire Limited | Manufacturing | 2011 |
| AHT Consulting Ltd | Manufacturing | 2018 |
| Ahtisham Corporation Limited | Administrative & support | 2026 |
| Ahura Collection Ltd | Professional & scientific | 2023 |
| AI Solutions Engineer Ltd | Manufacturing | 2026 |
| AI Web Tech Ltd | Information & communication | 2024 |
| AI4ALL Technologies Limited | Information & communication | 2022 |
| Aias Artificial Intelligence Limited | Information & communication | 2023 |
| AIB Accountancy Ltd | Professional & scientific | 2017 |
| AIC Bazaar Ltd | Wholesale & retail | 2024 |
| Aicam Limited | Information & communication | 2010 |
| Aida Digital Solution Limited | Information & communication | 2026 |
| Aidan Naughton Travel Services Ltd | Administrative & support | 2010 |
| Aidancehr Ltd | Professional & scientific | 2025 |
| Aidina Properties Limited | Real estate | 2025 |
| AIK Recycling Ltd | Transport & logistics | 2023 |
| AIK Swindon Ltd | Wholesale & retail | 2020 |
| AIM Consultancy Services Ltd | Transport & logistics | 2018 |
| AIM to FLY UK Ltd | Arts & recreation | 2026 |
| Aimms Tech Ltd | Information & communication | 2020 |
| Aims Food Limited | Hospitality | 2026 |
| Aims Traders Limited | Hospitality | 2016 |
| Air Photo Services Limited | Professional & scientific | 2004 |
| Air Sentry Limited | Manufacturing | 2020 |
| Airbnb Cleans Ltd | Administrative & support | 2025 |
| Aireception Ltd | Information & communication | 2025 |
| Airesk Ltd | Information & communication | 2026 |
| Airgo Swindon Ltd | Transport & logistics | 2026 |
| Airhostswap Ltd | Administrative & support | 2026 |
| Airide Solutions UK Limited | Wholesale & retail | 2023 |
| Airline Business Solutions Limited | Information & communication | 2007 |
| Airs and Graces Limited | Wholesale & retail | 2013 |
| Aistone Properties (Leaseholds) Limited | Professional & scientific | 2006 |
| AJ Autos - Tuning Limited | Wholesale & retail | 2020 |
| AJ Baxter Consultancy Ltd | Information & communication | 2013 |
| AJ Consulting Solutions Limited | Professional & scientific | 2024 |
| AJ Health Limited | Health & social care | 2023 |
| AJ International Ltd | Construction | 2018 |
| AJ Landscape & Construction Ltd | Construction | 2024 |
| Ajaero Limited | Manufacturing | 2012 |
| AJB Technology Limited | Information & communication | 2025 |
| AJC Planning Design Ltd | Professional & scientific | 2025 |
| Ajcdesign Ltd | Professional & scientific | 2024 |
| AJH Haulage Ltd | Transport & logistics | 2020 |
| Ajiks Solutions Limited | Health & social care | 2018 |
| Ajlee Property’S Ltd | Real estate | 2026 |
| AJM Construction Services Ltd | Professional & scientific | 2016 |
| AJM Servicing Repairs Ltd | Wholesale & retail | 2023 |
| Ajos Fitness Ltd | Arts & recreation | 2026 |
| AJR (Swindon) Ltd | Hospitality | 2017 |
| AJR Ltd | Financial services | 2025 |
| AK Commercial Vehicle Solutions Ltd | Wholesale & retail | 2023 |
| AK PVT Ltd | Wholesale & retail | 2017 |
| AK Technology Limited | Information & communication | 2014 |
| AKA Assets Investments Ltd | Real estate | 2023 |
| AKA Fried Chicken Ltd | Hospitality | 2019 |
| Akash (Holdings) Limited | Professional & scientific | 2011 |
| Akers Developments Ltd | Construction | 2024 |
| AKI SW Limited | Hospitality | 2012 |
| Akinade Wellbeign Matters Ltd | Health & social care | 2019 |
| Akinyemi& Adenike Company Limited | Health & social care | 2018 |
| AKM88 Build Ltd | Construction | 2026 |
| AKM989 Consultancy Ltd | Information & communication | 2025 |
| Akofrimp Ltd | Extraterritorial | 2025 |
| Akora Limited | Professional & scientific | 2024 |
| AKR118 Ltd | Financial services | 2025 |
| AKS Delivery Ltd | Transport & logistics | 2025 |
| AKS IT Consultancy Limited | Information & communication | 2020 |
| Akwaaba Barber Shop Limited | Other services | 2018 |
| Al-Falah Wholesale Ltd | Wholesale & retail | 2025 |
| Al-Habib Islamic Educational and Cultural Centre Swindon | Other services | 2011 |
| AL2K Services Limited | Professional & scientific | 2004 |
| Alan Alexander Flooring Limited | Wholesale & retail | 2010 |
| Alan Hawkins Estate Agents Limited | Real estate | 2003 |
| Alan King Racing Limited | Arts & recreation | 1999 |
| Alan Reynolds Decorators Limited | Construction | 2009 |
| Alan Watkins Motor Repairs Limited | Wholesale & retail | 2017 |
| Alans Cotswold Krays Limited | Wholesale & retail | 2025 |
| Alat Accounting Services Limited | Professional & scientific | 2023 |
| Alate Consulting Ltd | Construction | 2013 |
| Alba E Aida (Highworth) Limited | Hospitality | 2017 |
| Albadyne Limited | Professional & scientific | 2015 |
| Albany Star LLP | | 2025 |
| Albert Court (Westminster) Freehold Company Ltd | Households | 1999 |
| Albert Court (Westminster) Management Company Limited | Households | 1977 |
| Albert CUB Investments Limited | Real estate | 2018 |
| Albert Insights Limited | Information & communication | 2016 |
| Albino Transport Limited | Transport & logistics | 2016 |
| Albion Marketing Ltd | Professional & scientific | 2011 |