| ALL Star Parties & Events Ltd | Arts & recreation | 2025 |
| ALL Supplies Hire Ltd | Extraterritorial | 2013 |
| Allergy Companions Ltd | Wholesale & retail | 2021 |
| Allergy Consulting Ltd | Professional & scientific | 2024 |
| Allerpack Ltd | Health & social care | 2020 |
| Allesley Grove Management Company Ltd | Construction | 2024 |
| Alliance Express Ltd | Transport & logistics | 2020 |
| Allied Associates Ltd | Professional & scientific | 2024 |
| Alloy Aqua Blast Company Ltd. | Wholesale & retail | 2016 |
| Allthorpe Consulting Ltd | Professional & scientific | 2020 |
| Alltk Property Ltd | Real estate | 2023 |
| Alpha Electrical Midlands Limited | Construction | 2003 |
| Alpha Heating Ltd | Construction | 2022 |
| Alpha Properties (Leamington) Limited | Real estate | 2024 |
| Alphateq Limited | Manufacturing | 2003 |
| Alpine Travel Solutions Ltd | Transport & logistics | 2022 |
| Alsop Greenacre Skinner Limited | Administrative & support | 2024 |
| Alsters Kelley LLP | | 2010 |
| Alsters Kelley Solicitors Limited | Professional & scientific | 2013 |
| Altag Investment Ltd | Real estate | 2022 |
| Altech Services Ltd | Information & communication | 2019 |
| Altern Solutions Ltd | Professional & scientific | 2025 |
| Alternative Funding Centre Limited | Financial services | 2015 |
| Altimus.Com Limited | Professional & scientific | 1996 |
| Altrasky Limited | Professional & scientific | 2003 |
| Alum Creations Limited | Manufacturing | 2013 |
| Aluxtria Technologies Limited | Wholesale & retail | 2026 |
| Alvance Aluminium Germany Ltd | Manufacturing | 2021 |
| Alvance Aluminium Service UK Ltd | Financial services | 2020 |
| Alverne Lodge (Leamington) Limited | Households | 1962 |
| Alveston Projects (International) Ltd | Professional & scientific | 2022 |
| Always About People Ltd | Professional & scientific | 2009 |
| AM Courier Services Ltd | Transport & logistics | 2026 |
| AM Holdings (Leeds) Limited | Real estate | 2021 |
| AM Studioworks Limited | Professional & scientific | 2017 |
| Amahaj Investments 1 Ltd | Financial services | 2026 |
| Aman Hayer Productions Limited | Information & communication | 2011 |
| AMARA06 Limited | Health & social care | 2025 |
| Amare Estates Limited | Financial services | 2023 |
| Amare Homes (Shurdington) Limited | Construction | 2023 |
| Amare Homes Limited | Construction | 2023 |
| Ambarsariye Ltd | Real estate | 2023 |
| Amber and Coffee Lodge Limited | Real estate | 2025 |
| Amber Security Limited | Administrative & support | 2017 |
| Amblecote Property Ltd | Households | 2024 |
| AMC Property Group Limited | Construction | 2018 |
| AMC UK Developments Ltd | Construction | 2015 |
| AMD Arts Consultancy Ltd | Arts & recreation | 2019 |
| Amee Conzult Limited | Professional & scientific | 2018 |
| Amel Solutions Limited | Wholesale & retail | 2014 |
| AMF Sebring Sprites Limited | Other services | 2016 |
| Amherst Financial Management Limited | Financial services | 2002 |
| Amie Rose Ltd | Other services | 2021 |
| Amken Limited | Professional & scientific | 2002 |
| Ammac Design Limited | Professional & scientific | 2000 |
| Amnesia House UK Promotions Ltd | Arts & recreation | 2023 |
| Amnt Holdings Limited | Financial services | 2025 |
| Amnt Limited | Hospitality | 2024 |
| AMP Management Consultants Ltd | Professional & scientific | 2015 |
| Amplifi Group Limited | Information & communication | 2015 |
| Amplifi UK Holdings Limited | Information & communication | 2021 |
| AMS Distribution Centre Ltd | Transport & logistics | 2014 |
| Amvr Developments Limited | Real estate | 2013 |
| AMY Coded Ltd | Information & communication | 2026 |
| AMY Shields Limited | Health & social care | 2022 |
| Amy.Ai Ltd | Information & communication | 2025 |
| Amy’S Little Kitchen Ltd | Hospitality | 2025 |
| AN Organised YOU Ltd | Other services | 2019 |
| Anagem Developments Limited | Construction | 1993 |
| Analyst Engineering Ltd | Professional & scientific | 2014 |
| Anchor Accountants UK Ltd | Professional & scientific | 2026 |
| Anchorage Automotive Engineering Services Limited | Extraterritorial | 2017 |
| Anchorhill Limited | Construction | 1973 |
| Anchorstone Organisational Development Limited | Professional & scientific | 2024 |
| Ancient Oaks Tree Surgeons Limited | Administrative & support | 2023 |
| Ancoats Manchester Limited | Construction | 2020 |
| Ancris Ltd | Hospitality | 2022 |
| Anderson & Co. Ventures Limited | Hospitality | 2025 |
| Andes and Baltic Holdings Limited | Financial services | 2025 |
| Andrew Barnes Property Ltd. | Real estate | 2018 |
| Andrew Josephs Associates Limited | Professional & scientific | 2021 |
| Andrew Josephs Limited | Professional & scientific | 2002 |
| Andrew Worby Design Ltd | Professional & scientific | 2013 |
| Andson Holdings Limited | Administrative & support | 2024 |
| Andy & Rhiannon Property Ltd | Real estate | 2024 |
| Andy Hales Architect Ltd | Professional & scientific | 2026 |
| Angelic Holdings Limited | Financial services | 2015 |
| Angelic Mortgage Services Limited | Financial services | 2017 |
| Angelly Limited | Hospitality | 2021 |
| Angie Smith Mortgage Services Ltd | Financial services | 2021 |
| Angove Developments Limited | Construction | 2004 |
| Angry Swan Labs Ltd | Information & communication | 2025 |
| Angry Swan Ltd | Information & communication | 2025 |
| Aniforte UK Ltd | Wholesale & retail | 2016 |
| Anna Walker Consulting Ltd | Professional & scientific | 2024 |
| Annjon Management Limited | Professional & scientific | 2019 |
| Anprodata Limited | Transport & logistics | 2016 |
| Anthony Holbrook Properties Ltd | Real estate | 2021 |
| Anthony Pharrell Ltd | Professional & scientific | 2015 |
| Antiques of Warwick Limited | Wholesale & retail | 2011 |