| AMN Excavations Ltd | Construction | 2025 |
| AMN Properties (Northampton) Ltd | Real estate | 2021 |
| Amocura Investments Limited | Financial services | 2008 |
| Among Good People Ltd | Wholesale & retail | 2024 |
| Amore Pets Ltd | Transport & logistics | 2021 |
| Amoreiras Property Limited | Real estate | 2019 |
| Amoressi Ltd | Manufacturing | 2019 |
| Amovillas Ltd | Construction | 2020 |
| Ampics Media Ltd | Information & communication | 2026 |
| Ampidge Electrical Services Ltd | Construction | 2026 |
| Amplitude Communications Limited | Information & communication | 2013 |
| Amplitude Technology Limited | Information & communication | 2014 |
| Ampra Homes Limited | Real estate | 2018 |
| Amqjv Luton Ltd | Other services | 2020 |
| Amri Hass Avocados Ltd | Agriculture & fishing | 2025 |
| Amri International Properties Limited | Real estate | 2018 |
| Amritpal Services Limited | Construction | 2021 |
| AMS Autocare Ltd | Wholesale & retail | 2017 |
| AMS Holdings 2018 Limited | Financial services | 2018 |
| AMS Installations Ltd | Manufacturing | 2016 |
| AMS Motorsport Ltd | Professional & scientific | 2019 |
| AMS Property Services Limited | Construction | 2018 |
| AMS Recycling Limited | Wholesale & retail | 2024 |
| AMS Repairs Ltd | Transport & logistics | 2020 |
| AMS Wholesale Ltd | Wholesale & retail | 2018 |
| Amutan Limited | Information & communication | 2016 |
| AMV Heating and Plumbing Ltd | Construction | 2025 |
| Amvara Consulting Limited | Information & communication | 2023 |
| Amvt Properties Ltd | Real estate | 2025 |
| AMY Charlotte Bespoke Ltd | Other services | 2024 |
| AMY Hughes Limited | Education | 2024 |
| AMY International Artists Limited | Arts & recreation | 1994 |
| Amy's Nails Northampton Ltd | Other services | 2023 |
| Amydam Ltd | Construction | 2026 |
| AMZ Heroes Ltd | Wholesale & retail | 2018 |
| AN Open Understanding Ltd | Professional & scientific | 2021 |
| AN Owal Ltd | Wholesale & retail | 2023 |
| ANA Barbu Ltd | Hospitality | 2017 |
| ANA Education Pro Limited | Transport & logistics | 2023 |
| ANA Events Limited | Wholesale & retail | 2025 |
| Anafo Exterior Solutions Limited | Administrative & support | 2025 |
| Anagy Farming Limited | Agriculture & fishing | 2024 |
| Analyse Systems Limited | Information & communication | 2010 |
| Anand Healing Ltd | Health & social care | 2024 |
| Anastasia Cargo Speed Ltd | Administrative & support | 2018 |
| Anatolia Box Ltd | Wholesale & retail | 2025 |
| Anayah Signature Limited | Wholesale & retail | 2026 |
| Anbookkeeping Service Ltd | Professional & scientific | 2021 |
| Ancaz Limited | Transport & logistics | 2020 |
| Anchor Farm Catering Ltd | Hospitality | 2023 |
| Anchor Maintenance Solutions Ltd | Construction | 2025 |
| Anchored Hands Ltd | Health & social care | 2014 |
| Ancida Limited | Administrative & support | 2018 |
| Ancient Beauty Ltd | Other services | 2023 |
| Anck Ltd | Professional & scientific | 2025 |
| Ancorare Qualita Ltd | Professional & scientific | 2026 |
| Ancore Logistics Ltd | Transport & logistics | 2018 |
| Ancris Transport Ltd | Transport & logistics | 2019 |
| AND HIS Mercy UK Limited | Health & social care | 2013 |
| AND Productions Limited | Information & communication | 2009 |
| Andaurama Ltd Limited | Wholesale & retail | 2023 |
| Andcad Haulage Ltd | Transport & logistics | 2023 |
| Andema Ltd | Transport & logistics | 2020 |
| Anderson Carpets & Home Limited | Wholesale & retail | 2019 |
| Anderson Cellular and Data Components Limited | Professional & scientific | 2004 |
| Anderson Stockley Accredited Training Ltd | Education | 2007 |
| Anderson's Activities Ltd | Hospitality | 2016 |
| Andi Construction Ltd | Construction | 2025 |
| Andora Trans Ltd | Transport & logistics | 2017 |
| Andra Construct Ltd | Construction | 2020 |
| Andras Logistics Limited | Wholesale & retail | 2017 |
| Andraueusebiu Ltd | Transport & logistics | 2018 |
| Andrea Yorston Interior Design Ltd | Wholesale & retail | 2020 |
| Andreea R Deliver Ltd | Transport & logistics | 2025 |
| Andreea Theodora Ltd | Transport & logistics | 2021 |
| Andreeas Auto Ltd | Transport & logistics | 2018 |
| Andrei Cleaning Pro Ltd | Administrative & support | 2025 |
| Andrei Mobile Welding Ltd | Mining & quarrying | 2025 |
| Andrei Seby Ltd | Transport & logistics | 2018 |
| Andrej Miller Consulting Ltd | Professional & scientific | 2026 |
| Andreoli Healthcare Transformation Limited | Professional & scientific | 2026 |
| Andrew a Woodfield Ltd | Construction | 2016 |
| Andrew James Leather Agencies Limited | Wholesale & retail | 1989 |
| Andrew Smedley Limited | Construction | 2014 |
| Andrew Smith Bookkeeping Services Ltd | Professional & scientific | 2009 |
| Andrew Ward Developments Ltd | Real estate | 2018 |
| Andrews Northampton Limited | Real estate | 2005 |
| Andrewsmithco Limited | Financial services | 2018 |
| Andricorp Global Commerce Ltd | Wholesale & retail | 2024 |
| Andries 88.COM Ltd | Construction | 2022 |
| Andrievschi & Sons Ltd | Construction | 2016 |
| Andrit Logistics Ltd | Transport & logistics | 2021 |
| Andriy&Ko Ltd | Transport & logistics | 2022 |
| Andromeda AM Ltd | Transport & logistics | 2022 |
| Andromeda Global Holdings Ltd | Professional & scientific | 2016 |
| Andromeda IT Consultancy Ltd | Information & communication | 2015 |
| Andromeda Services UK Ltd | Information & communication | 2017 |
| Andronic Property Investments Ltd | Real estate | 2026 |
| Andrzej K Inc Ltd | Transport & logistics | 2014 |
| Andrzejstrans Ltd | Transport & logistics | 2019 |