| Aintree Garage Doors Ltd | Construction | 2026 |
| Airgleam Ltd | Administrative & support | 2025 |
| Airsolutions-Nw Limited | Energy | 2015 |
| Ajbt Events Ltd | Arts & recreation | 2022 |
| Ajbt Projects Ltd | Arts & recreation | 2022 |
| AJG Contracting (NW) Ltd | Construction | 2018 |
| Ajgl Contractors Limited | Construction | 2020 |
| AJL Properties 2021 Ltd | Real estate | 2021 |
| Ajlrb Limited | Professional & scientific | 2025 |
| Ajmcg Services Limited | Construction | 2014 |
| AJS Courier Solutions Limited | Administrative & support | 2015 |
| AK Mobile Tech Ltd | Wholesale & retail | 2024 |
| Alan Howard & Sons Limited | Construction | 2018 |
| Alan. C. Murray Financial Information Limited | Financial services | 2003 |
| Albany Property Services NW Ltd | Real estate | 2011 |
| Alcance International Limited | Administrative & support | 2019 |
| Alcance Properties Limited | Real estate | 2026 |
| Alco Diesel Ltd | Wholesale & retail | 2017 |
| ALD Investments LLP | | 2008 |
| Alder House Liverpool Limited | Administrative & support | 2013 |
| Alere Ltd | Education | 2025 |
| Alex Evans Landscapes Ltd | Administrative & support | 2021 |
| Alexandra Lang Ltd | Professional & scientific | 2025 |
| Alexandria Fragrances Ltd | Wholesale & retail | 2019 |
| Alexandrine Ltd | Administrative & support | 2016 |
| ALF Property Investment and Management Ltd | Real estate | 2024 |
| Alfa Properties Ltd | Real estate | 2016 |
| Alfie and Dayna Limited | Hospitality | 2024 |
| Alfred Price & Sons Trustees Ltd | Extraterritorial | 2007 |
| Alfred Price & Sons,Limited | Wholesale & retail | 1938 |
| ALI Specialists Limited | Manufacturing | 2022 |
| Align People and Performance Ltd | Administrative & support | 2026 |
| Align Spinal Health Limited | Health & social care | 2021 |
| ALL Cleaning Specialists Ltd | Administrative & support | 2023 |
| Allerton Holdco Limited | Administrative & support | 2021 |
| Allied Dancing Association Limited | Arts & recreation | 1944 |
| Alloy Care Systems Limited | Wholesale & retail | 2011 |
| Alltime Trading Limited | Hospitality | 2017 |
| Alotek Ltd | Manufacturing | 2021 |
| Alotek Shelters Ltd | Manufacturing | 2025 |
| Alpha Smart Builders Ltd | Construction | 2015 |
| Alpha Smart Roofing & Building Services Ltd | Construction | 2015 |
| Alpha-Move Limited | Real estate | 2018 |
| Alpha-Move Property Management Limited | Real estate | 2018 |
| AM Powders Ltd | Manufacturing | 2022 |
| AM5 Football Ltd | Education | 2026 |
| Ambitious Concepts Limited | Wholesale & retail | 2019 |
| Ambrose Farm Ltd | Agriculture & fishing | 2023 |
| Amcco Ltd | Construction | 2021 |
| Amdn Food Group Limited | Financial services | 2024 |
| Amor Candles Ltd | Manufacturing | 2024 |
| Amtab Ltd | Real estate | 2022 |
| AMW Aurora Music Works (UK) Ltd | Wholesale & retail | 2024 |
| Anaedas Limited | Financial services | 2019 |
| Anatadan Coding Company Ltd | Health & social care | 2014 |
| Anchara Ltd | Wholesale & retail | 2025 |
| Andrew REA & Associates Limited | Administrative & support | 2015 |
| Andy Swan Driver Services Ltd | Other services | 2014 |
| Andy's Positive Programmes (App) CIC | Education | 2020 |
| Andys Courier Services Ltd | Transport & logistics | 2026 |
| Angela Dempsey Ltd | Health & social care | 2019 |
| Anjs Contracts Ltd | Other services | 2025 |
| Anmount Investments (U.K.) Limited | Construction | 1999 |
| ANR Property Group Ltd | Real estate | 2026 |
| Anric Properties LLP | | 2009 |
| Anthony Gibson Haulage Limited | Transport & logistics | 2015 |
| Anthony James Construction Limited | Construction | 2019 |
| AP Optical Networking Ltd | Information & communication | 2024 |
| Apex Mobile Detailing Ltd | Administrative & support | 2025 |
| Apex Motor Outlet Limited | Wholesale & retail | 2026 |
| Apiary Associates Ltd | Manufacturing | 2020 |
| Apiary Properties Ltd | Real estate | 2024 |
| Apollo Investments Limited | Real estate | 2018 |
| Apothecary Oils Limited | Wholesale & retail | 2014 |
| Applied Interactive Media Ltd | Information & communication | 1998 |
| Apssi Limited | Construction | 2026 |
| Aptitude Investments Limited | Professional & scientific | 2024 |
| AR05 CON Limited | Financial services | 2023 |
| Arbour Logistics Ltd | Transport & logistics | 2026 |
| Architectural Screening Limited | Professional & scientific | 2025 |
| Arcis Security Limited | Administrative & support | 2014 |
| Arctic Exterior Cleaning Limited | Administrative & support | 2026 |
| Arctol Consultancy Limited | Real estate | 2022 |
| Argo Business Consultants Limited | Professional & scientific | 2015 |
| Arroya Ltd | Wholesale & retail | 2008 |
| Arthur James Holdings Ltd | Professional & scientific | 2023 |
| Artstone Limited | Manufacturing | 1998 |
| AS Property Rentals Ltd | Real estate | 2021 |
| Aset Investments Limited | Real estate | 2020 |
| Ashcroft & Co. Limited | Arts & recreation | 2025 |
| Ashcroft Construction Services Ltd | Construction | 2024 |
| Ashcroft Electrical Services Ltd | Construction | 2016 |
| Ashgar Limited | Construction | 1984 |
| Ashley's Cakes Limited | Wholesale & retail | 2019 |
| Ashleysonline Limited | Wholesale & retail | 2006 |
| Asmall Nursery Payroll Limited | Education | 2019 |
| Asparagus PR Ltd | Professional & scientific | 2008 |
| Aspden's Coaches Ltd | Professional & scientific | 2002 |
| Aspire Living Developments LLP | | 2021 |
| Aspull Sports Performance Ltd | Arts & recreation | 2026 |