| Apex Football Development Ltd | Education | 2026 |
| Apex Roofing and Solar Ltd | Construction | 2025 |
| Apex Services NW Ltd | Construction | 2024 |
| Apex Tecti Ltd | Construction | 2025 |
| Apexlupin Property Management Limited | Households | 2006 |
| APP2EAT Ltd | Information & communication | 2022 |
| Apple Tree Lodges Ltd | Hospitality | 2021 |
| Approved Security Solutions Limited | Administrative & support | 2016 |
| Aprdot Limited | Professional & scientific | 2023 |
| Apres Tree (ST Helens) CIC | Hospitality | 2024 |
| Aqua Solutions (NW) Ltd | Construction | 2018 |
| Aqua UNI Ltd | Wholesale & retail | 2026 |
| Aqualis Cleaners Limited | Administrative & support | 2026 |
| Aquasource Products Limited | Manufacturing | 2015 |
| Aquatech Plumbing & Heating Specialist Ltd | Construction | 2021 |
| Ar-D Creative Limited | Professional & scientific | 2016 |
| Arbology Tree Care Ltd | Agriculture & fishing | 2026 |
| Archers Avenue Limited | Financial services | 2025 |
| Ardea Phonenix Ltd | Professional & scientific | 2024 |
| Argentra PLC | Financial services | 2025 |
| Argus Fluidhandling Limited | Manufacturing | 2008 |
| Arif Health Consulting Services Limited | Health & social care | 2017 |
| Arjun's Anglo-Indian Kitchen&Bar Limited | Hospitality | 2023 |
| ARK Sound Limited | Information & communication | 2012 |
| ARK Technology Group Ltd | Information & communication | 2021 |
| Arnway Limited | Manufacturing | 1973 |
| Aron's Barber ST Helens Ltd | Other services | 2025 |
| ART84 Ltd | Hospitality | 2011 |
| Arteriamedia Ltd. | Arts & recreation | 2011 |
| Arthur Morgan Financial Planning Ltd | Professional & scientific | 2019 |
| Artienne Group Limited | Financial services | 2018 |
| Artist LED ST Helens CIC | Education | 2026 |
| AS Engineers Ltd | Professional & scientific | 2022 |
| AS UK Logistic Ltd | Transport & logistics | 2018 |
| ASA Technical Services Limited | Professional & scientific | 2015 |
| Asante Apparel Ltd | Wholesale & retail | 2024 |
| Ascerta (Landscape, Trees, Ecology) Ltd | Professional & scientific | 2019 |
| Ascerta Consulting Ltd | Extraterritorial | 2011 |
| ASG Seven Properties Ltd | Construction | 2026 |
| Ashalls (of Manchester) Limited | Transport & logistics | 2023 |
| Ashcrofts Holdings Ltd | Construction | 2023 |
| Asian Cuisine Restaurant 1 Ltd | Hospitality | 2024 |
| Asil Food Ltd | Hospitality | 2026 |
| ASK Machinery Ltd | Wholesale & retail | 2022 |
| Askews Building Services Ltd | Construction | 2021 |
| Askh Machinery Ltd. | Wholesale & retail | 2017 |
| ASO Care Ltd | Health & social care | 2023 |
| ASP Excavation Limited | Construction | 2017 |
| ASP Holdings Limited | Financial services | 2017 |
| Aspects of Glass Toughened Ltd | Manufacturing | 2021 |
| Aspire 2011 LLP | | 2008 |
| Aspire by Kneads CIC | Education | 2025 |
| ASQ Equestrian Ltd | Wholesale & retail | 2025 |
| Asset Safety Services (NW) Limited | Professional & scientific | 2017 |
| Assheton Ophthalmology Limited | Health & social care | 2019 |
| Association of Protecting Exotic Species CIC | Agriculture & fishing | 2025 |
| Assured FIX Limited | Construction | 2012 |
| Astro Estates Limited | Real estate | 2026 |
| ASV Global Ltd | Administrative & support | 2025 |
| AT Blade Services Ltd | Other services | 2020 |
| AT Vertex Ltd | Wholesale & retail | 2025 |
| ATB Plumbing & Heating Ltd | Construction | 2018 |
| ATB Wholesale Group Ltd | Wholesale & retail | 2026 |
| ATE Transport Ltd | Transport & logistics | 2024 |
| ATH Concrete Ltd | Manufacturing | 2023 |
| Athesa Ltd | Wholesale & retail | 2020 |
| Atius Ltd | Real estate | 2020 |
| Atom North West Ltd | Wholesale & retail | 2024 |
| ATP Technical Consultancy Ltd | Construction | 2023 |
| Attentive Detailing Ltd | Wholesale & retail | 2025 |
| Attitude Vision Ltd | Administrative & support | 2020 |
| Aura Beauty Clinic Treatments and Training Ltd | Other services | 2026 |
| Aura Spa Limited | Other services | 2025 |
| Auraleth Ltd | Health & social care | 2025 |
| Austin Construction Management Ltd | Construction | 2019 |
| Auto Medic Solutions Ltd | Wholesale & retail | 2021 |
| Auto Plas Bumper Recycling Ltd | Water & waste | 2022 |
| Auto Rodge Ltd | Wholesale & retail | 2026 |
| Auto Safety Centre (North West) Limited | Other services | 2009 |
| Automotive Passion Limited | Wholesale & retail | 2019 |
| Autony's Ltd | Wholesale & retail | 2026 |
| Autoparts Northwest Ltd | Wholesale & retail | 2023 |
| Autoxclusive Group Limited | Wholesale & retail | 2016 |
| Auxilium Manus Care Ltd | Health & social care | 2024 |
| AV Modern Bathrooms Ltd | Construction | 2024 |
| AVA Remarketing Ltd | Wholesale & retail | 2026 |
| Avatar TV Limited | Extraterritorial | 2020 |
| Averist Ltd | Other services | 2018 |
| Avondale Gardens Management Company Limited | Households | 2013 |
| AVS Network Limited | Other services | 2025 |
| Ayaba & Co Limited | Manufacturing | 2025 |
| Ayan Tyre Services Ltd | Manufacturing | 2025 |
| Ayma Ltd | Transport & logistics | 2024 |
| B K D Ayeni Logistics Limited | Transport & logistics | 2024 |
| B&M Transport Light Haulage Ltd | Transport & logistics | 2015 |
| B.D. Cars (NW) Limited | Wholesale & retail | 2013 |
| B.K. Sealants Limited | Manufacturing | 2025 |
| B.M.R.C. Limited | Wholesale & retail | 2024 |
| BAC Logistics Limited | Transport & logistics | 2014 |
| Bachem (U.K.) Limited | Manufacturing | 1986 |