| Acumen QS Ltd | Professional & scientific | 2025 |
| AD Drylining Ltd | Construction | 2021 |
| Adam Mini Market Sthelens Limited | Wholesale & retail | 2025 |
| Adamgoldthorpeconstruction Ltd | Construction | 2025 |
| Adapa UK ST Helens Limited | Manufacturing | 1983 |
| Addtime Properties Limited | Real estate | 2020 |
| Addtime Recording Company Limited | Administrative & support | 1989 |
| Adem Properties Ltd | Real estate | 2023 |
| Ademir Ltd | Hospitality | 2025 |
| Adept Cladding Ltd | Construction | 2019 |
| Adetem Global Resources Limited | Wholesale & retail | 2024 |
| Adlq Tech Ltd | Wholesale & retail | 2023 |
| Admea Solutions Limited | Professional & scientific | 2025 |
| Admin Services Limited | Administrative & support | 2017 |
| Adml Electrical Ltd | Construction | 2020 |
| Adonis Pars Ltd | Wholesale & retail | 2025 |
| ADT Haulage Limited | Transport & logistics | 2021 |
| Advance Beauty Clinic Ltd. | Other services | 2013 |
| Advance TEK Ltd | Wholesale & retail | 2017 |
| Advanced Insulation Materials Ltd | Wholesale & retail | 2009 |
| Advantage Ahci Ltd | Financial services | 2018 |
| Advantura Limited | Manufacturing | 2023 |
| Advex Solutions Ltd | Administrative & support | 2025 |
| Aessa Consulting Services Ltd | Professional & scientific | 2019 |
| Aesthetics Training Pro Ltd | Education | 2019 |
| Affinity Properties North West Ltd | Real estate | 2021 |
| Agapis Logistics Ltd | Transport & logistics | 2023 |
| AGB Sports Limited | Wholesale & retail | 2023 |
| AGH Property Developments Limited | Construction | 2024 |
| AGH Property Services Limited | Other services | 2024 |
| Agis Media Limited | Professional & scientific | 2015 |
| AGM Access Limited | Construction | 2015 |
| AGW Electrical Services North West Limited | Construction | 2018 |
| AH Maintenance Ltd | Construction | 2019 |
| AH Plumbing & Heating Bathroom Specialist Limited | Construction | 2023 |
| Ahci Group Limited | Financial services | 2018 |
| Ahci Limited | Financial services | 2014 |
| AHR Care Ltd | Health & social care | 2019 |
| AIB Civil Engineering Ltd | Construction | 2017 |
| AID4U Limited | Wholesale & retail | 2009 |
| Aidan Alexander Estates and Lettings Limited | Real estate | 2022 |
| Aidapt (Wales) Limited | Manufacturing | 2002 |
| Aidapt International Ltd | Wholesale & retail | 2000 |
| AIM and Achieve CIC | Information & communication | 2018 |
| Air, Land and Sea Duty Free Ltd | Wholesale & retail | 2021 |
| Airtec Filtration Limited | Wholesale & retail | 1997 |
| AIS Medical & Dental Ltd | Health & social care | 2021 |
| AJ Properties & Developments North West Ltd | Real estate | 2025 |
| Ajacs Europe Limited | Other services | 2013 |
| Ajam Consultancy Ltd | Professional & scientific | 2026 |
| Ajcarmotor Limited | Wholesale & retail | 2026 |
| AJM Inspired Ltd | Professional & scientific | 2020 |
| AJM Property Management Ltd | Construction | 2020 |
| Ajmm Logistics Ltd | Transport & logistics | 2019 |
| Ajonlinecoaching Ltd | Other services | 2025 |
| AJS Aircraft Services Ltd | Manufacturing | 2025 |
| AJS Care Consultancy Limited | Professional & scientific | 2017 |
| Aj’S Bar Ltd | Hospitality | 2025 |
| AKA Estates Limited | Hospitality | 2014 |
| AKA Travel Club Ltd | Administrative & support | 2026 |
| Akesg Ltd | Hospitality | 2019 |
| AKJ Build ST Helens Ltd | Construction | 2025 |
| AKL Rail Ltd | Administrative & support | 2018 |
| Alan E Webb Ltd | Extraterritorial | 2024 |
| Alan Griffiths Turf and Forestry Ltd | Agriculture & fishing | 2014 |
| Alan Tunstall Holdings Ltd | Financial services | 2016 |
| ALC Aesthetics Limited | Other services | 2020 |
| Alekso Floor Coatings Ltd | Construction | 2025 |
| Alex Drive 55 Ltd | Wholesale & retail | 2016 |
| Alexander Site Engineering Limited | Construction | 2016 |
| Alexanders Barbers Alan Ltd | Other services | 2025 |
| Alexandrew Haul Ltd | Transport & logistics | 2024 |
| Alextom Limited | Health & social care | 2022 |
| Alexwalmsley Limited | Arts & recreation | 2024 |
| Alfa Gomma (UK) Limited | Manufacturing | 1991 |
| Alfred Hotel Limited | Hospitality | 2024 |
| Alien Beauty LAB Ltd | Arts & recreation | 2024 |
| Align Engineering and Consulting Ltd | Construction | 2026 |
| Alkady Food Ltd | Wholesale & retail | 2025 |
| Alkegen UK Holdco II Ltd. | Professional & scientific | 2023 |
| ALL in One Express Bridge ST Ltd | Wholesale & retail | 2014 |
| ALL in One Express New Ferry Ltd | Wholesale & retail | 2017 |
| ALL Miles Ltd | Transport & logistics | 2023 |
| ALL Round Security Consultants Limited | Construction | 2004 |
| ALL Round Security Facilities Limited | Construction | 2020 |
| ALL Saints Solutions (Rainford) Limited | Real estate | 2016 |
| ALL Seasons Landscaping and Driveways Ltd | Administrative & support | 2018 |
| ALL Star Convenience Ltd | Wholesale & retail | 2024 |
| ALL Things SEN and More Ltd | Education | 2024 |
| Allan Barber ST Helens Ltd | Other services | 2024 |
| Alldone Trading Limited | Wholesale & retail | 2013 |
| Allen Baxter Developments Ltd | Construction | 2022 |
| Allen Baxter Properties Ltd | Real estate | 2024 |
| Allestree Healthcare Ltd | Wholesale & retail | 2020 |
| Alliance Funding Limited | Financial services | 2018 |
| Allied Lift Services Division (UK) Ltd | Construction | 2002 |
| Allied Pharmacies Limited | Administrative & support | 2010 |
| Alma Products Limited | Manufacturing | 1982 |
| Alpha Campers Limited | Construction | 2025 |
| Alpha Rewinds Limited | Manufacturing | 2025 |