| ABM Commercial Services Limited | Construction | 2021 |
| ABO Investments Ltd | Real estate | 2019 |
| Above & Beyond Events Ltd. | Administrative & support | 2017 |
| ABR Property Investments Limited | Real estate | 2016 |
| Abracadabra Studio Ltd | Information & communication | 2024 |
| ABS Building Services (North West) Limited | Construction | 2020 |
| ABS CON Control Ltd | Wholesale & retail | 2025 |
| Absolute Consultants Limited | Information & communication | 2019 |
| ABT Global Limited | Wholesale & retail | 2014 |
| ABT Transport Limited | Administrative & support | 2004 |
| AC Charge Ltd | Construction | 2021 |
| AC Creations Ltd | Arts & recreation | 2019 |
| AC Electrical Services (NW) Ltd | Construction | 2002 |
| AC Electrical Services Group Limited | Financial services | 2016 |
| AC Global Yachting Ltd | Extraterritorial | 2024 |
| AC Haulage Ltd | Transport & logistics | 2025 |
| AC Holdings (Fylde) Limited | Financial services | 2019 |
| AC Home Specialists Limited | Construction | 2017 |
| AC Signage Ltd | Construction | 2026 |
| Acacia MOT Ltd | Wholesale & retail | 2013 |
| ACB Software Ltd | Other services | 2012 |
| Access Electrical Techniques Ltd | Construction | 2019 |
| Access Solutions Ltd | Construction | 2025 |
| Access Support Teams Ltd | Construction | 2022 |
| Accident ALL Ltd | Other services | 2016 |
| Accommodated Limited | Hospitality | 2022 |
| Accountancy North West Limited | Professional & scientific | 2016 |
| Accounting & Finance Specialist Ltd | Information & communication | 2015 |
| Accurate Property Services NW Ltd | Households | 2018 |
| Accusafe Consulting Limited | Professional & scientific | 2019 |
| Acczes Ltd | Education | 2020 |
| Ace Electrical NW Limited | Construction | 2015 |
| Ace Properties (NW) Ltd | Construction | 2003 |
| Ace Security Systems UK Ltd | Administrative & support | 2025 |
| Ace Technology Consulting Ltd | Information & communication | 2018 |
| Acellux Limited | Manufacturing | 2026 |
| Acenes House Limited | Real estate | 2013 |
| ACH Finance Limited | Professional & scientific | 2017 |
| Aci-Uk Limited | Administrative & support | 1999 |
| Acies Process Servers Limited | Professional & scientific | 2015 |
| ACJ Commercial Limited | Real estate | 2020 |
| Acjc Properties Limited | Real estate | 2021 |
| Ackers Limited | Information & communication | 2015 |
| Acklam Financial Limited | Financial services | 2003 |
| Ackroyd Ltd | Construction | 2025 |
| ACL Atlantic Limited | Wholesale & retail | 2007 |
| ACM Property Investments Ltd | Real estate | 2020 |
| Acorn International Ministries | Other services | 2002 |
| Acorn School Transport Limited | Transport & logistics | 2019 |
| Acps+ Ltd | Construction | 2017 |
| Acreford Developments Ltd | Wholesale & retail | 2025 |
| Acrux Investments Ltd | Extraterritorial | 2023 |
| ACS Consultants (UK) Ltd | Administrative & support | 2014 |
| ACT7 Ltd | Information & communication | 2026 |
| Action TAG Ltd | Manufacturing | 2006 |
| Active Artists Academy Ltd | Administrative & support | 2020 |
| Active Artists Agency Limited | Administrative & support | 2017 |
| Activity Breaks Ltd | Wholesale & retail | 2025 |
| Acute Heating Services Limited | Construction | 2018 |
| AD Cooling Ltd | Manufacturing | 2021 |
| AD Wiseman (U.K.) Limited | Construction | 2012 |
| Adalena House Ltd | Health & social care | 2021 |
| Adam Blackpool Store Ltd | Wholesale & retail | 2025 |
| Adam Deliveries Ltd | Transport & logistics | 2023 |
| Adam Franks Limited | Health & social care | 2016 |
| Adam Moseley Joinery & Design Limited | Construction | 2020 |
| Adam Tranter Weddings Ltd | Other services | 2021 |
| Adamapple Ltd | Wholesale & retail | 2016 |
| Adams Pizza House Limited | Hospitality | 2014 |
| Adata Marine Limited | Extraterritorial | 2024 |
| ADB Pipeline Access Limited | Professional & scientific | 2012 |
| ADC Electrical & Property Services Limited | Construction | 2011 |
| Adcas Financial Management Limited | Financial services | 2002 |
| Adcroft Hilton Limited | Administrative & support | 2005 |
| Addicted to Better Ltd | Real estate | 2023 |
| Addison & Sons Ltd | Wholesale & retail | 2021 |
| Address Street Ltd | Information & communication | 2024 |
| Address to LET Ltd | Real estate | 2024 |
| Adelaide Court (Blackpool) Management Company Limited | Households | 1975 |
| Adeliae Ltd | Real estate | 2020 |
| Adelphi Apartments Ltd | Hospitality | 2003 |
| Ademleyla Ltd | Wholesale & retail | 2019 |
| Adenike Care Limited | Administrative & support | 2017 |
| Adept Scaffolding (NW) Ltd | Construction | 2025 |
| ADG Yachting Ltd | Extraterritorial | 2026 |
| Adgas+ Ltd | Construction | 2016 |
| ADH Fencing Limited | Construction | 2014 |
| ADH Retail Ltd | Professional & scientific | 2019 |
| Adhr Flair UK Limited | Professional & scientific | 2010 |
| Adjf Properties Ltd | Real estate | 2022 |
| Adluminious Media Group LLP | | 2025 |
| ADM1N Consultancy Services Limited | Public administration | 2026 |
| Admiral Point RTM Company Limited | Households | 2008 |
| Admirals Sound Property Management Limited | Households | 1998 |
| Adolescent Care and Therapy Training Ltd | Education | 2026 |
| Adored by Ellingworths Ltd | Administrative & support | 2012 |
| Adored Care Ltd | Health & social care | 2022 |
| Adqa Medical Devices Limited | Professional & scientific | 2020 |
| ADR Healthcare Consultants Ltd | Professional & scientific | 2025 |
| Adrian Cowderoy Consulting Ltd | Information & communication | 2015 |