| Amreen Intellects Ltd | Information & communication | 2021 |
| Amrimia Limited | Extraterritorial | 2002 |
| AMS 1960 Limited | Manufacturing | 2004 |
| AMS Cleaning Limited | Administrative & support | 2002 |
| AMS Developers Ltd | Construction | 2025 |
| AMS Investments (Southampton) Ltd | Real estate | 2013 |
| AMS Living Ltd | Real estate | 2022 |
| AMS Project Solutions Limited | Professional & scientific | 2023 |
| AMS Therapy Ltd | Health & social care | 2024 |
| Amsam (Southampton) Limited | Other services | 1989 |
| Amsted Global Limited | Professional & scientific | 2011 |
| Amsted Real Estate Limited | Real estate | 2019 |
| AMT Boat Experiences Ltd | Administrative & support | 2023 |
| AMU Taxi Ltd | Transport & logistics | 2023 |
| AMY Ainsworth Hair and Beauty Ltd | Other services | 2021 |
| AMY Barnes Consulting Limited | Administrative & support | 2005 |
| AMY Brocklebank Consulting Limited | Professional & scientific | 2024 |
| AMY Gardens Management Limited | Households | 2004 |
| AMY Perkins Garden Design Limited | Professional & scientific | 2013 |
| AMZ Connect Ltd | Wholesale & retail | 2024 |
| AN Element Wellness UK Limited | Other services | 2024 |
| AN76 Limited | Construction | 2019 |
| ANA Enviro Services Ltd | Water & waste | 2022 |
| ANA Maria Dinu Limited | Health & social care | 2014 |
| Anai Ship Design Ltd | Professional & scientific | 2019 |
| Analyse and Co Ltd | Wholesale & retail | 2024 |
| Analytic Business Consulting Limited | Extraterritorial | 2009 |
| Anamera Group Limited | Construction | 2017 |
| Anamulsiyam Ltd | Wholesale & retail | 2025 |
| Ananda Himalaya Limited | Wholesale & retail | 2008 |
| Ananda Paul Ltd | Real estate | 2024 |
| Anandpur Limited | Construction | 2015 |
| Anavec Healthcare Solution Ltd | Health & social care | 2018 |
| Anaya Logistics Limited | Transport & logistics | 2019 |
| Anby Limited | Other services | 2014 |
| Anca Trandafir Ltd | Health & social care | 2015 |
| Ancasta Antibes Boat Sales Ltd | Wholesale & retail | 2021 |
| Ancasta International Boat Sales Limited | Wholesale & retail | 1990 |
| Anchor & Bloom Social Practise Ltd | Health & social care | 2026 |
| Anchor Air Limited | Construction | 2014 |
| Anchor Counselling (Hampshire) Limited | Professional & scientific | 2025 |
| Anchor Design Limited | Professional & scientific | 2018 |
| Anchor Financial Advisory Limited | Financial services | 2021 |
| Anchor Hope Enterprises Ltd | Real estate | 2021 |
| Anchor Maintenance Limited | Construction | 2020 |
| Anchor Management Solutions Limited | Professional & scientific | 2006 |
| Anchor Parking Ltd | Other services | 2024 |
| Anchor Pipework Limited | Construction | 2013 |
| Anchor Rail Limited | Construction | 2017 |
| Anchor Real Estate (Worcester) Ltd | Real estate | 2023 |
| Anchor Real Estate Limited | Construction | 2017 |
| Anchorage (Hamble) Flat Management Limited | Households | 2017 |
| Ancientlair Ltd | Manufacturing | 2018 |
| Ancla Developments Limited | Extraterritorial | 2025 |
| Ancla Group Limited | Administrative & support | 2025 |
| Ancla Living Limited | Extraterritorial | 2025 |
| Ancla Management Limited | Administrative & support | 2026 |
| Ancla Realty Limited | Real estate | 2019 |
| AND Technical Services Limited | Professional & scientific | 1996 |
| Andar Consulting Limited | Professional & scientific | 2021 |
| Andean Services Limited | Wholesale & retail | 2004 |
| Anderson (GEO) Ltd | Professional & scientific | 2007 |
| Anderson Information Technology Services Limited | Information & communication | 2018 |
| Anderson Reed Financial Services Ltd | Financial services | 2021 |
| Anderson Reed Specialist Finance Ltd | Financial services | 2023 |
| Anderson Swift Ltd | Real estate | 2021 |
| Anderwood Ltd | Real estate | 2025 |
| Andes Limited | Administrative & support | 2009 |
| Andie-Rose Ltd | Arts & recreation | 2018 |
| Andluc Limited | Construction | 2006 |
| Andnowdeliver Limited | Professional & scientific | 2020 |
| Ando's ALL Trades Limited | Administrative & support | 2022 |
| Andrei & Patrick Trans Ltd | Transport & logistics | 2025 |
| Andrew Ager Consulting Limited | Professional & scientific | 2018 |
| Andrew Best Car Doctor Limited | Wholesale & retail | 2019 |
| Andrew Blake Executive Chauffeur Cars Ltd | Transport & logistics | 2014 |
| Andrew Cole Limited | Health & social care | 2003 |
| Andrew Gammon Property Holdings Limited | Real estate | 2022 |
| Andrew Hetherton Consulting Limited | Professional & scientific | 2017 |
| Andrew Maccallum Ltd | Arts & recreation | 2025 |
| Andrew Noss Limited | Transport & logistics | 2015 |
| Andrew Pritchard Services Limited | Construction | 2020 |
| Andrew Ward Services Ltd | Construction | 2015 |
| Andrew Wright Research Limited | Information & communication | 2013 |
| Andrews Quantity Surveyors Ltd | Professional & scientific | 2002 |
| Andromede a 711 Flaine Limited | Professional & scientific | 1987 |
| Andronachecourier Ltd | Transport & logistics | 2020 |
| Andrusca Dowling Consultancy Limited | Professional & scientific | 2026 |
| Andrzej Lewicki Ltd | Transport & logistics | 2015 |
| Andy Banwell Limited | Administrative & support | 2008 |
| Andy Bunn Couriers Ltd | Transport & logistics | 2014 |
| Andy Carla Courier Ltd | Transport & logistics | 2023 |
| Andy Harding Sales Limited | Wholesale & retail | 2023 |
| Andy Harris Limited | Construction | 2003 |
| Andy Trans Ltd | Transport & logistics | 2026 |
| Andyglobal BI Limited | Public administration | 2026 |
| Andy’S Coffee Shop Ltd | Hospitality | 2025 |
| Anelys & Allison Logistic Ltd | Transport & logistics | 2025 |
| Anelys Courier Ltd | Transport & logistics | 2023 |
| ANG Georgio Ltd | Health & social care | 2022 |